taxonID	type	description	language	source
1E0187ECFFC9FFE3FF6DF99FB13BCAD6.taxon	materials_examined	Material examined. 8 3, 3 Ƥ, Seomang, Jindo Is., 23 July 1994, (B. J. Kang); 17 3, 1 Ƥ, Namchang, Haenam-gun, 20 May 1998; 2 Ƥ, Heungnam, Geojedo Is., 3 July 1998; 78 3, 9 Ƥ, Chubongdo Is., Tongyeong-si, 10 July 1998, (C. M. Lee); 1 3, Changsundo Is., Namhae-gun, 20 November 1999; 3 3, 1 Ƥ, Panpo-ri, Jejudo Is., 11 July 2001; 2 3, Imwon, Samcheok-si, 22 August 2001; 12 3, 5 Ƥ, Wolpyeong, Jindo Is., 29 June 2004; 1 3, Mohang, Buangun, 2 October 2004; 2 3, Inpyeong-dong, Tongyeong-si, 23 August 2005; 5 Ƥ, Seokbyeong-ri, Pohang-si, 26 August 2005; 13 3, 1 Ƥ, Okdo Is., Seosan-si, 24 August 2006; 54 3, 10 Ƥ, Gobongpo, Baengnyeongdo Is., 12 July 2006; 2 3, Yonggipo, Baengnyeongdo Is., 12 July 2006; 47 3, 7 Ƥ, Junghwa-ri, Baengnyeongdo Is., 13 July 2006; 4 specimens, Mongsanpo, Taean-gun, 23 August 2006; 50 specimens, Daeho, Dangjin-gun, 1 September 2006; 18 specimens, Sapgyo, Yesan-gun, 21 December 2006; 17 specimens, Gajin, Goseong-gun, 22 February 2007; 6 specimens, Bongpo, Goseong-gun, 23 February 2007; 11 specimens, Gobongpo, Baengnyeongdo Is., 13 July 2007 (S. S. Hong); 30 specimens, Yonggipo, Baengnyeongdo Is., 14 July 2007 (S. S. Hong); 3 specimens, Gajin, Goseong-gun, 3 August 2007; 30 specimens, Sacheon, Gangreung-si, 8 May 2008; 4 specimens, Anmok, Gangreungsi, 9 May 2008; 7 specimens, Bito-ri, Sacheon-si, 22 May 2008; 2 specimens, Dapo, Geojedo Is., 13 June, 2008; 4 specimens, Ganggu, Yeongdeok-gun, 20 June 2008; 10 specimens, Namhangjin, Gangreung-si, 10 July 2008 (H. H. Sang); 12 specimens, Gyeongpo, Gangreung-si, 11 July 2008 (S. S. Hong); 3 specimens, Unjin port, Jejudo Is., 4 September 2008; 20 specimens, Bangpo, Taean-gun, 2 April 2009 (S. S. Hong); 3 specimens, Seodo-ri, Geomundo Is., 16 April 2009. Type locality. Oshoro, Hokkaido, Japan.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC9FFE3FF6DF99FB13BCAD6.taxon	description	Description. Male. Body (Figs. 2 A, 3 A) small, about 2.5 mm long, strongly chitinized; cephalon as wide as long, slightly longer than pereonites 1 – 2 combined; rostrum short and minute; eye comparatively large, subcircular, composed of numerous ommatidia, occupying much of the cephalon, vermillion color when alive, lateral cephalic lobe broadly rounded; pereonites subequal in length to pleonites; urosomite 1 (Fig. 3 B) slightly notched dorsomedially, dorsodistally with weak carination; urosomites 2 – 3 distally truncated, lateral margins raised into ridges, hollowed dorsally, ridges armed with 2 or 3 pairs of dorsal spines. Antenna 1 (Fig. 3 C) peduncular article 1 stout, slightly convex ventromedially, half of ventrodistal margin with long setular tufts; length ratio of peduncular articles 1 – 3 = 1.00: 0.66: 0.26; accessory flagellum very small, uniarticulate, with 1 apical seta; flagellum 8 - articulate, armed with aesthetascs ventrally. Antenna 2 (Fig. 3 D) slightly shorter than twice length of antenna 1; peduncular articles 1 – 3 short, peduncular article 4 1.10 x as long as peduncular article 5, with numerous setular tufts dorsally; flagellum 14 - articulate, subequal in length to peduncle. Mandible (Fig. 3 E) incisor smooth, marginally bifid, with weak definitions; right lacinia mobilis bifurcate, proximal branch 3 – 4 dentate, distal branch with 2 – 3 blunt teeth; left lacinia mobilis 5 - dentate; molar well developed. Maxilla 1 (Fig. 3 F) inner plate much smaller than outer, without apical seta; outer plate with 7 tooth-like spines apically; palp biarticulate, apical article longer than proximal, with 1 subapical, 2 apical setae and slender acute tooth. Maxilla 2 (Fig. 3 G) inner plate about 0.7 x as long as outer plate, with 3 apical and subapical setae; outer plate curved, with 1 seta laterally and 5 setae apically. Gnathopod 1 (Fig. 3 H) coxa comparatively small, oblong, with 2 fine setules ventrally; basis narrowing and curved proximally, anteromedial margin with 2 short setae, posterior margin with 5 long setae, distally with 1 long seta; carpus triangular, about 0.8 x as long as propodus, with unipectinate stiff spines ventrally; propodus quadrate, with 3 unipectinate setae dorsally; palm nearly transverse, with fine unequal setules marginally, defined by 4 spines on palmar corner; dactylus falcate, slightly shorter than length of palm. Gnathopod 2 (Fig. 3 I) coxa similar to coxa 1, narrowing distally, with 3 fine setules ventrally; basis linear, elongate, with 2 fine setae anterodistally, 5 long setae posteriorly, distally with 1 seta; carpus and propodus more slender than those of gnathopod 1; propodus about 1.1 x as long as carpus, palm defined by 3 spines on palmar corner; dactylus falcate, inner margin with 1 tooth. Pereopod 3 (Fig. 4 A) coxa narrowly rounded, ventral margin with 4 – 5 setules; basis rectangular, about 1.6 x as long as merus; carpus about half as long as merus, with 4 strong spines ventrally; propodus more slender and about 1.2 x as long as carpus; dactylus short. Pereopod 4 (Fig. 4 B) very similar to pereopod 3, but coxa 4 larger and wider; carpus with 3 strong spines ventrally. Pereopod 5 (Fig. 4 C) coxa bilobate, posterodistal lobe round, large, broadly expanded ventrally; basis subovate, pear-shaped, narrowing proximally, 0.7 x as wide as long; ischium to dactylus thin, more slender than basis; merus about 1.2 x as long as carpus, with 5 anterior setae and 1 posterodistal spine; carpus about 1.1 x as long as propodus, posterior margin with 1 – 1 – 2 spine formula; propodus rectangular, with posterodistal spine; dactylus falcate, about half length of propodus. Pereopod 6 (Fig. 4 D) coxa subovate, comparatively smaller than those of the other pereopods; basis ovate, slightly convex anteriorly, expanded posteriorly; ischium with 1 anterodistal pinnate setae; merus longer and broader than carpus, both margins with 5 pinnate setae; carpus slightly longer than propodus, posterior margin with 1 – 1 – 2 spine formula. Pereopod 7 (Fig. 4 E) coxa subovate, slightly longer than wide; basis wide, anterior margin straight, very broadly expanded posteriorly, about 0.9 x as wide as long; merus and carpus setose, with pinnate setae and spines, merus broad, about 1.4 x as long as carpus, carpus and propodus subequal in length. Uropod 1 (Fig. 4 F) peduncle slightly more than twice the length of outer ramus, with 2 dorsolateral spines; inner ramus slightly shorter than outer, both with strong apical spines. Uropod 2 (Fig. 4 G) peduncle about 1.7 x as long as outer ramus; outer and inner rami subequal in length, both with strong apical spines. Uropod 3 (Fig. 4 H) peduncle stout, slightly longer than outer ramus, with apicolateral robust spine; outer ramus slightly shorter than inner, with 5 plumose setae and 1 spine; inner ramus with 3 plumose setae and 1 or 2 spines. Telson (Fig. 4 I) subtriangular, length about 1.3 x width, deeply cleft (85 %), each lobe with 1 apical pinnate spine and row of dorsal cuticular pores. Female. Body (Fig. 5 A) small, about 3.4 mm long. Similar to male, but body broader, eye much smaller, antennae 1 – 2 (Figs. 5 B – C) without setular tufts on peduncles; antenna 2 much shorter, pereonites broader than those of male; pereopod 5 (Fig. 5 D) basis broader, with row of pinnate setae on anterior margin; rami of uropod 3 (Fig. 5 E) without plumose setae; telson (Fig. 5 F) subtriangular, without row of cuticular pores dorsally.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC9FFE3FF6DF99FB13BCAD6.taxon	distribution	Distribution. Japan (Hokkaido), Korea.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC9FFE3FF6DF99FB13BCAD6.taxon	discussion	Remarks. Specimens examined generally conform to the original description of Ishimaru (1987), with some minor morphological differences. These differences include the number of flagellar articles of antenna 1, the spination on the peduncles and rami of uropods 1 – 3 and the armature of the telson. These morphological differences seem to be size related or local variation.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC4FFE4FF6DF99FB16CC94E.taxon	materials_examined	Type material. Holotype, adult male, 2.6 mm, (appendages on one slide), cat no. NIBRIV 0000240789, Seongsanpo, Jejudo Is., 33 ° 28 ʹ 25 ʺN, 126 ° 56 ʹ 0 6 ʺE, 6 May 1994, (B. J. Kang), collected from light trap on bottom, depth 5 m. Paratypes, 1 Ƥ, 2.5 mm, dissected (appendages on one slide), NIBRIV 0000240790, other data same as holotype; 2 adult 3, CMNC 2011 - 0183 other data same as holotype; 1 adult 3, 2.4 mm, dissected (appendages on one slide), 1 3, 2.3 mm, DKU cat no. 201101, other data same as holotype, and the remaining paratypes (23 3, 22 Ƥ) in the collection of the first author. Additional material examined: 4 3, Hanlim, Jejudo Is., 11 August 1998; 2 3, Sewha, Jejudo Is., 12 August 1998.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC4FFE4FF6DF99FB16CC94E.taxon	etymology	Etymology. The species name is derived from the type locality, Jejudo Island located off the south coast of Korea.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC4FFE4FF6DF99FB16CC94E.taxon	diagnosis	Diagnosis. Antenna 1, peduncular article 2 rather slender, about 3 / 4 length of article 1; maxilla 1, inner plate small, lacking apical seta, palp uniarticulate; gnathopod 2 (male), carpus elongate, 1.6 x length of propodus; pereopod 5, merus broad, 0.5 x as wide as long; urosomite 1 lacking dorsal elevation; urosomites 2 – 3 extending anteriorly far beyond end of urosomite 1.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC4FFE4FF6DF99FB16CC94E.taxon	description	Description. Holotype, adult male, 2.6 mm, cat no. NIBRIV 0000240789. Body (Figs. 2 B, 6 A) strongly chitinized; cephalon subequal in length to pereonites 1 – 3 combined; rostrum short, lateral cephalic lobe triangular, narrowly rounded; eye large, rounded, composed of numerous ommatidia, slightly bulging. Pleonites (Fig. 6 B) weakly carinate; epimeron 1 with anterior sinus, slightly produced anteroventrally, with 2 small setae, posteroventral corner rounded; epimeron 2 rounded ventrally, with 3 small setae; epimeron 3 anteroventrally rounded, ventral margin straight, with 3 ventral and 2 posteroventral setae, posteroventral corner quadrate. Urosomite 1 (Figs. 6 B, 10 A – B) about 0.8 x as long as following urosomite, lacking dorsal keel, appearing separate from the following urosomite in dorsal view; urosomites 2 – 3 sloped posteriorly, isosceles triangularly shaped in dorsal view, anterodorsal portion shallowly notched, anteriorly extending far beyond end of urosomite 1, shallowly fluted between lateral ridges. Antenna 1 (Fig. 6 C) subequal in length to cephalon and pereonites 1 – 4 combined; length ratio of peduncular articles 1 – 3 = 1.00: 0.69: 0.27, peduncular article 1 slightly convex posteriorly, with 2 thin, long simple setae and numerous setular tufts; peduncular article 2 slender, with 4 clusters of setae and 1 penicillate seta posteriorly; accessory flagellum vestigial, uniarticulate, with 1 simple seta and 1 tiny aesthetasc; flagellum 9 - articulate, with 1 or 2 marginal aesthetascs. Antenna 2 (Fig. 6 D) slightly shorter than half body length; peduncular articles 1 – 3 short, gland cone well developed, peduncular article 4 slightly longer and stouter than peduncular article 5, with numerous setular tufts anteriorly; flagellum 18 - articulate. Lower lip (Fig. 6 E) inner lobes broadly rounded, outer lobes with 1 shoulder tooth apically; both lobes pubescent apically. Left mandible (Fig. 6 F) incisor smooth, broad, weakly bifurcate; lacinia mobilis blunt, weakly 5 - dentate; molar process well developed, protruding, strongly sclerotized; accessory spines or setae lacking. Right mandible (Fig. 6 G) smooth, similar to left one; incisor smooth, rounded; lacinia mobilis weakly bifid; molar process with 1 pappose seta. Maxilla 1 (Fig. 6 H) inner plate small, triangular, without apical seta; outer plate with 7 tooth-like spines (simple, bifid and denticulate) apically; palp uniarticulate, slightly extending over apex of outer plate, apically with 2 simple setae and small tooth. Maxilla 2 (Fig. 6 I) inner plate rounded apically, shorter than outer one, medial and apical margins with 4 simple setae; outer plate with 4 simple setae apically and 1 sub-apical short seta on lateral margin. Maxilliped (Fig. 6 J) inner plate small, with 2 apical setae; outer plate large, extending beyond end of palp article 2, medial margin with 5 setae and 6 conical teeth; palp 4 - articulate, article 2 about half as long as palp, medial margin with 2 rows of setae, article 3 about 0.4 x as long as article 2, distal article falcate, shorter than article 3. Gnathopod 1 (Fig. 7 A) coxa elongate-ovate, anterior and ventral margins with 5 feeble setae; basis, strongly curved proximally, anterior margin with 4 short setae and 1 median long seta, posterodistal margin with 1 long seta; merus tapering distally, about 1.5 x as long as ischium, with 3 setae posterodistally; carpus gradually widening, about 1.3 x as long as propodus, posterior margin with 6 spines; propodus subrectangular, medial face with an angled row of 5 setae, palm obliquely inclined, about 0.6 x as long as ventral margin, with tiny unequal setules marginally, delimited by 3 spines distally; dactylus fitting palm, with distinct tooth on inner margin. Gnathopod 2 (Fig. 7 B) slender, uniform in width; coxa 2 similar to coxa 1; basis elongate, rectangular, subequal in length to carpus and propodus combined, with 5 short setae anteriorly, 1 long setae posteriorly; carpus elongate, 1.63 x as long as propodus, posteriorly with clusters of simple setae; propodus subrectangular, medial face with an angled row of 4 setae, palm oblique, delimited by 4 spines distally; dactylus fitting palm. Pereopod 3 (Fig. 7 C) slender, linear; coxa 3 wider than coxa 2, with 5 feeble setae ventrally; posterior margin of carpus with row of 5 spines; length ratio of articles 2 – 7 = 1.00: 0.29: 0.73: 0.40: 0.37: 0.18. Pereopod 4 similar to pereopod 3. Pereopod 5 (Fig. 7 D) coxa bilobate, subequal in length and width, posterior lobe strongly protruding downward; basis pear-shaped, about 1.5 x as long as merus, margins with tiny setae; merus slightly broadened, about half as wide as long, gradually widening distally, anteroventral corner with 2 – 3 spines; carpus to dactylus slender, length ratio = 1.00: 0.85: 0.51. Pereopod 6 (Fig. 7 E) coxa small, subrectangular, with rounded corners, weakly bilobate; basis about 0.8 x as wide as long, posterior margin convex, strongly expanded, tapering distally; merus slightly broad, about 1.8 x as wide as carpus; length ratio of articles 4 – 7 = 1.00: 0.95: 0.69: 0.34. Pereopod 7 (Fig. 7 F) coxa subrectangular, slightly deeper than wide, posterior margin convex, gently curved; basis greatly expanded posteriorly, anterior margin nearly straight, posterior margin rounded, subequal in length to the following articles combined; merus broadened, widening distally, anterior margin with rows of plumose setae and spines, posterior margin with 3 plumose setae and 1 distal seta; carpus, about 0.8 x as long as merus, anterior margin with rows of plumose setae and spines, posterior margin with 4 plumose setae and 1 slender seta apically. Uropod 1 (Fig. 7 G) peduncle 2.3 x length of rami, with 2 dorsolateral robust spines, 1 medial spine, 5 basofacial plumose setae and 1 apicomedial spine; rami subequal, outer ramus with 3 dorsolateral and 2 unequal apical spines. Uropod 2 (Fig. 7 H) peduncle about 1.9 x as long as outer ramus, with 4 dorsolateral robust spines and 1 apicomedial seta; outer ramus slightly shorter than inner one, with 3 robust dorsolateral spines, 1 medial spine and 2 unequal spines apically; inner ramus with 1 apicolateral and 1 apical spine. Uropod 3 (Fig. 7 I) slightly longer than uropod 2; peduncle stout, subequal in length to inner ramus, with apicolateral robust spine; outer ramus slightly shorter than inner one, lateral margin with 2 robust spines, medial margin with 4 plumose setae and 2 feeble setae apically; inner ramus with row of 8 plumose setae on medial margin and 2 feeble setae on lateral margin. Telson (Fig. 6 K) subtriangular, gradually narrowing distally, about 1.3 x as long as wide, deeply cleft, dorsal surface of each lobe with a pair of tiny penicillate setae and row of 3 – 4 cuticular pores, lateral margins of both lobes with 6 – 7 simple setae and 1 penicillate seta, apically with long simple seta. Paratype, adult female, 2.5 mm, cat no. NIBRIV 0000240790. Body (Fig. 8 A) similar to male, but body less compressed, eye smaller, antennae 1 – 2 shorter, especially antenna 2; pleonites narrower than those of male, cephalon as long as pereonites 1 – 2 combined. Antenna 1 (Fig. 8 B) about 2.7 x as long as cephalon; length ratio of peduncular articles 1 – 3 = 1.00: 0.58: 0.26, peduncular article 1 with 2 tiny unequal penicillate setae posterodistally; accessory flagellum very small, with 1 simple seta and 1 tiny aesthetasc apically; flagellum 6 - articulate. Antenna 2 (Fig. 8 C) short, about 0.7 x as long as antenna 1; gland cone of peduncular article 2 elongate, extending far beyond end of peduncular article 3; flagellum 3 - articulate, subequal in length to peduncular article 5. Gnathopod 1 (Fig. 8 D) slightly broader than that of male; carpus prominently shorter than that of male, subequal in length to propodus. Gnathopod 2 (Fig. 8 E) broader than that of male; basis elongate, subequal in length to following articles combined; carpus about 1.36 x as long as propodus, these articles shorter than those of male; palm of propodus not as strongly oblique as male, palmar corner with 3 spines. Pereopods 5 – 7 (Figs. 9 A – 9 C) nearly similar to those of male. Uropod 1 (Fig. 9 D) peduncle about 1.7 x as long as rami, with 1 dorsolateral and apicomedial spine, and 4 basofacial plumose setae; rami subequal in length, outer ramus with 1 lateral and 1 apicolateral spines, with 2 unequal spines apically. Uropod 2 (Fig. 9 E) peduncle about 1.4 x as long as rami, rami subequal in length, outer ramus with 2 dorsolateral and 2 distal spines. Uropod 3 (Fig. 9 F) peduncle slightly longer than outer ramus, with apicolateral robust spine; outer ramus about 0.8 x as long as inner one, with 1 robust spine laterally and 2 feeble setae apically; inner ramus with 5 subdistal setae. Telson (Fig. 9 G) similar to male in form, except each lobe with less marginal setae.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC4FFE4FF6DF99FB16CC94E.taxon	discussion	Remarks. This new species resembles Guernea minor Ishimaru, 1987 distributed in Japanese waters, in having similar mouthpart structure and broadened merus of pereopod 5. However, the new species is distinguished from G. minor (different characters of G. minor in brackets) by the following: 1) urosomite 1 without dorsal keel (vs posterior half produced dorsally into thin and high crest); 2) the anterodorsal portion of urosomites 2 – 3 placed above urosomite 1 (vs not extended toward urosomite 1); 3) peduncular articles of antennae 1 – 2 elongate, especially peduncular article 2 of antenna 1 rectangular, much longer than wide (vs rather stout, peduncular article 2 of antenna 1 quadrate, slightly longer than wide); 4) in male, carpus of gnathopod 2 elongate, about 1.63 x as long as propodus (vs short, about 1.4 x as long as propodus). In adult specimens of G. jejuensis, the anterodorsal portion of urosomites 2 – 3 is slightly notched while this notch is lacking in juveniles (2.1 mm, female). The dorsal ridges are also continued backward in juveniles. Moreover, the indentation of the dorsal plane of urosomites 2 – 3 is shallower than those of adult specimens. Distribution. Korea (Jejudo Is.).	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC2FFFFFF6DF86DB111C9A6.taxon	materials_examined	Type material. Holotype, adult male, 3.3 mm, (appendages on one slide), cat. no. NIBRIV 0000240791, Namchang, Haenam-gun, 34 ° 24 ʹ 0 8 ʺN, 126 ° 37 ʹ 38 ʺE, 20 May 1998, (C. M. Lee & Y. H. Kim), collected from light trap on bottom, depth 8 m. Paratypes, 1 Ƥ, 4.0 mm, dissected (appendages on one slide), NIBRIV 0000240792, other data same as holotype; 1 adult 3, 2.3 mm, CMNC 2011 - 0184, Chubongdo Is. Tongyeong-si, 34 ° 45 ʹ 0 7 ʺN, 128 ° 33 ʹ 25 ʺE, 10 July 1998, (C. M. Lee), collected from light trap on bottom, depth 5 m. Additional material examined. 4 3, Nohwado Is., Wando-gun, 23 May 1998, (C. M. Lee); 4 3, Chubongdo Is. Tongyeong-si, 10 July 1998, (C. M. Lee); 1 3, yeompo, Oenarodo Is., 30 July 2001; 4 3, Haban, Oenarodo Is., 30 July 2001; 1 3, Bangjukpo, Dolsando Is., 20 Mar, 2004; 1 3, Paengmok, Jindo Is., 28 June 2004.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC2FFFFFF6DF86DB111C9A6.taxon	etymology	Etymology. The specific epithet namhaensis originates from the Korean word “ Nam-Hae ”, meaning the South Sea, after the southern Korean coast in which the species was discovered.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC2FFFFFF6DF86DB111C9A6.taxon	diagnosis	Diagnosis. Lateral cephalic lobe extending far beyond end of peduncular article 1 of antenna 1, apically narrow; maxilla 1, inner plate small, lacking apical seta, palp uniarticulate; pleonites weakly carinate; urosomite 1 with well developed, rounded dorsal keel, extending backward above following urosomite; urosomites 2 – 3 distally truncated, ridged laterally, margins with 5 – 6 spines, dorsal surface hollowed with transverse row of anterior spines.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC2FFFFFF6DF86DB111C9A6.taxon	description	Description. Holotype, adult male, 3.3 mm, cat no. NIBRIV 0000240791. Body (Figs. 2 C, 11 A) strongly chitinized; cephalon subequal in length to pereonites 1 – 2 combined; rostrum triangular, somewhat apically protruded between antenna 1; eye medium, bulging, each ommatidium concentrated in the center; lateral cephalic lobe narrowly rounded, extending far beyond end of article 1 of antenna 1. Pleonites 1 – 3 (Fig. 11 B) weakly carinate; epimeron 1 with anterior sinus, slightly produced anteroventrally, with 1 small seta; epimeron 2 rounded anteroventrally, with 5 small setae ventrally; epimeron 3 similar to pleonal epimeron 2, but smaller and less concave posterodorsally, posterior margin nearly straight. Urosomite 1 (Fig. 11 C) dorsal carination broadly rounded, slightly extending over urosomites 2 – 3; urosomites 2 – 3 with 5 – 6 pairs of spines on the lateral ridge, sloped dorsal margin with a transverse row of 4 – 5 spines. Antenna 1 (Fig. 11 D) about twice as long as cephalon and pereonite 1 combined; length ratio of peduncular articles 1 – 3 = 1.00: 0.55: 0.24, peduncular article 1 slightly sinuate dorsally, with middorsal hump, convex ventromedially, with 2 thin, long simple setae and numerous long setular tufts; flagellum 8 - articulate, slightly shorter than peduncle. Antenna 2 (Fig. 11 E) 1.53 x as long as antenna 1; gland cone well developed, article 4 swollen posteromedially, 1.28 x as long as article 5, with numerous setular tufts anteriorly; flagellum 13 - articulate (broken), longer than peduncle. Lower lip (Fig. 11 F) inner lobes well developed, fused basally, outer lobes with 1 small apical tooth on shoulders; both lobes densely pubescent apically. Right mandible (Fig. 11 G) smooth, triangular; incisor broad, rounded apically; lacinia mobilis bifid, with 2 smooth teeth; molar process very large, protruding, strongly sclerotized, with 1 pappose seta. Maxilla 1 (Fig. 11 H) inner plate small, without seta; outer plate with 9 tooth-like spines (simple, bifid and denticulate) apically; palp uniarticulate, extending past outer plate, with 5 simple setae and an acute tooth apically. Maxilla 2 (Fig. 11 I) inner plate much shorter than outer, medial and apical margin with 5 simple setae; outer plate with 7 apical simple setae and 1 sub-medial short seta on lateral margin. Maxilliped (Fig. 11 J) inner plate small, with 2 apical setae; outer plate large, broad, extending beyond end of palp article 2, medial margin with 5 setae and 9 conical teeth; palp 4 - articulate, proximal article with 1 long seta posterodistally, medial margin of article 2 with 12 simple and 5 pinnate setae, article 3 0.36 x as long as article 2, medial margin setose, article 4 very short, 0.18 x as long as article 3. Gnathopod 1 (Fig. 12 A) coxa tapering distally, with feeble setae ventrally; basis slightly S-shaped proximally, gradually widening; anterior margin of merus very short, concealed by the abutment of carpus; carpus elongate, triangular, subequal in length to propodus, with 10 simple or pinnate setae posteriorly; propodus subrectangular, medial side with 1 angled row of 5 unipinnate setae, palm 0.60 x as long as ventral margin, with tiny setules marginally, corner delimited by 4 spines distally; dactylus falcate, 0.41 x as long as propodus, inner margin with 1 distinct tooth. Gnathopod 2 (Fig. 12 B) similar to gnathopod 1, but coxa 2 larger than coxa 1, basis not curved proximally, merus tapering distally, carpus and propodus more slender. Pereopod 3 (Fig. 12 C) slender, linear, coxa 3 similar to coxa 2, with 9 feeble setae ventrally; both margins of merus setose, posterior margin of carpus with 5 spines; length ratio of articles 2 – 7 = 1.00: 0.23: 0.59: 0.33: 0.40: 0.18. Pereopod 4 (Fig. 12 D) similar to pereopod 3, but less setose, coxa 4 slightly wider, posterior margin slightly concave, basis distinctly shorter; length ratio of articles 2 – 7 = 1.00: 0.28: 0.72: 0.38: 0.51: 0.28. Pereopod 5 (Fig. 12 E) coxa bilobate, 0.90 x as wide as long, posterior lobe broadly rounded, protruding downward; basis broad, bulging midanteriorly, 1.74 x as long as merus; ischium to dactylus slender, length ratio of articles 4 – 7 = 1.00: 0.79: 0.74: 0.40. Pereopod 6 (Fig. 12 F) coxa small, bilobate, slightly concave ventral margin; basis 0.90 x as wide as long, anterior margin rather straight, posterior margin expanded, convex, with 5 feeble setules; merus with 1 spine and 5 plumose setae anteriorly, 7 plumose setae posteriorly; length ratio of articles 4 – 7 = 1.00: 0.79: 0.80: 0.41. Pereopod 7 (Fig. 12 G) coxa subrectangular, longer than wide; basis broad, greatly expanded, anterior margin straight, posterior margin rounded, 0.79 x as wide as long; merus and carpus expanded broadly, with plumose, simple, pinnate setae and spines on both margins; propodus slender, subequal in length to carpus. Uropod 1 (Fig. 12 H) peduncle longer than rami, length 1.71 x outer ramus, medial margin with 4 spines; outer ramus 1.13 x as long as inner; inner ramus with 4 medial spines and 1 basofacial seta; both rami with long apical spine. Uropod 2 (Fig. 12 I) about 0.6 x as long as uropod 1; peduncle about 1.5 x as long as outer ramus, with 5 dorsolateral and 1 ventrodistal spine; outer ramus 0.9 x as long as inner one, with 4 outer, 2 subapical and 2 apical spines; inner ramus with 2 outer, 1 inner, 2 subapical and 1 long apical spine. Uropod 3 (Fig. 12 J) slightly shorter than uropod 1; peduncle stout, about 0.8 x as long as rami; both rami subequal in length, with outer spines and inner plumose setae. Telson (Fig. 12 K) subtriangular, narrowing distally, deeply cleft, about 1.6 x as long as wide, dorsomedian surface of each lobe with 1 pair of supple setae, half of dorsodistal surface covered with 7 – 9 pappose setae and 4 feeble marginal setae. Paratype, adult female, 4.0 mm, cat no. NIBRIV 0000240792. Body (Fig. 13 A) stouter than male. Eye (Fig. 13 B) rounded, bulging, smaller than that of male; lateral cephalic lobe not extending beyond article 2 of antenna 1. Pereonites somewhat broader than in male, while pleonites (Fig. 13 C) narrower. Pleonite 1 more tapering distally than that of male. Urosomite 1 process narrower and raised slightly higher, extending backward above following urosomite dorsodistally. Sloped dorsal quadrate plane of urosomites 2 – 3 (Fig. 13 D) enclosed by spines, except ventral margin. Antenna 1 (Fig. 13 E) about 1.3 x as long as cephalon; shorter and stouter than in male, length ratio of peduncular articles 1 – 3 = 1.00: 0.44: 0.20, article 1 naked, slightly sinuate dorsally, with middorsal hump, with 2 tiny plumose setae posterodistally; flagellum 6 - articulate, about half length of peduncle. Antenna 2 (Fig. 13 F) slightly shorter than antenna 1, peduncular article 4 long, naked, more than twice length of article 5; flagellum very short, 3 - articulate. Pereopod 5 (Fig. 13 G) similar to male, but coxa wider, about 0.8 x as wide as long, anteromedian margin of basis with 19 plumose setae. Uropod 3 (Fig. 13 H) peduncle subequal in length to rami, with 1 apicolateral spine; rami subequal in length, outer ramus with 4 dorsolateral spines, inner with 2 dorsolateral spines. Telson (Fig. 13 I) triangular, deeply cleft, about 1.5 x as long as wide, dorsal surface of each lobe with 6 – 7 pappose spines, lateral margin with 3 – 4 tiny setae, 1 penicillate seta lateromedially and distally with 1 pappose spine.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC2FFFFFF6DF86DB111C9A6.taxon	discussion	Remarks. Guernea namhaensis is similar to G. tomiokaensis Hirayama, 1985 from Japanese waters, in possessing a similar shaped dorsal keel of urosomite 1 and having the lateral cephalic lobe extending far beyond peduncular article 1 of antenna 1. However, our species is obviously distinguished from G. tomiokaensis (different characters of G. tomiokaensis in brackets) by the following group of features: 1) inner plate of maxilliped small, with 2 apical setae and the distal article of palp bears 2 small apical setae (vs inner plate vestigial, with 1 short apical seta and the distal article of palp bears 1 small apical seta); 2) posterior lobe of coxa 5 broadly rounded, extending strongly downward (vs not extending downward); 3) urosomite 1 extends backward above following urosomite dorsodistally (vs not extended backward above following urosomite); 4) urosomites 2 – 3 quadrate in dorsal view, sloped plane with 5 or 6 pairs of lateral spines and 1 transverse row of 4 or 5 dorsal spines (vs triangular in dorsal view, only with 5 opposite pairs of lateral spines); and 5) peduncle of uropod 3 subequal in length to rami (vs peduncle 0.6 x as long as rami). The new species is also similar to Guernea sombati Hirayama, 1986 from the South China Sea and Hong Kong. Our new species however, is distinguished from G .. s o m b a t i (different characters of G .. sombati in brackets) by the following features: 1) lateral cephalic lobe extending far beyond peduncular article 1 of antenna 1 (vs extending to near the end of peduncular article 1 of antenna 1); 2) in male, antenna 1 peduncle longer than flagellum (vs shorter than flagellum); 3) in male, antenna 2 peduncular article 4 swollen (vs relatively slender); 4) in male, antenna 2 peduncular article 5 relatively slender and elongate, 0.78 x as long as article 4 (vs short, about 0.5 x as long as article 4); 5) in female, antenna 1 peduncular article 2 short and stout, 0.44 x as long as article 1 (vs elongate, about 0.8 x as long as article 1); and 6) urosomites 2 – 3 with 5 or 6 pairs of lateral spines and a transverse row of 4 or 5 dorsal spines (vs 5 spines on each of the dorsal ridges).	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFC2FFFFFF6DF86DB111C9A6.taxon	distribution	Distribution. Korea (south coast).	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFD9FFFCFF6DFB4FB033CC82.taxon	materials_examined	Material examined. 24 3, Anpo, Yeosu-si, 20 March 2004; 1 3, Doyang, Goheung-gun, 7 July, 2005; 4 3, Yonggipo, Baengnyeongdo Is., 12 July 2006; 2 3, Yongdong-ri, Goheung-gun, 22 June 2008. Type locality. Tomioka Bay, Kyushu, Japan.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFD9FFFCFF6DFB4FB033CC82.taxon	description	Description. Male. Body (Figs. 2 D, 14 A) slender, small, about 2.7 mm long, strongly chitinized; cephalon slightly longer than pereonites 1 – 2 combined; eye small, round, black; lateral cephalic lobe round, produced forward; pereonites smooth; pleonite 1 (Fig. 14 B) broader than pleonites 2 and 3, with 1 ventral and 2 anterodistal setae; pleonite 2 subequal in width to pleonite 3, ventral margin rounded, with 6 – 7 setae; urosomite 1 with characteristic strong dorsal carina, gradually rising dorsodistally well beyond end of urosomite 1. Antenna 1 (Fig. 14 C) length ratio of peduncular articles 1 – 3 = 1.00: 0.52: 0.26, peduncular article 1 widest in middle, about 0.6 x as long as wide, distal half of ventral margin with long setular tufts; flagellum 7 - articulate, shorter than peduncle, with slender aesthetascs ventrally. Antenna 2 (Fig. 14 D) elongate, slightly shorter than body length; peduncular articles 1 – 3 short, peduncular article 4 convex ventromedially, 1.60 x as long as article 5, with numerous setular tufts dorsally; flagellum slender, elongate, about 4 x as long as peduncle, more than 26 - articulate. Lower lip (Fig. 14 E) inner lobes well developed, as long as outer; outer lobes subquadrate, apical margin flat, with fine pubescence. Mandible (Figs. 14 F – G) similar to each other, subtriangular; incisor broad, smooth and blunt; lacinia mobilis medium, left bidentate, right tridentate; molar prominent, well developed. Maxilla 1 (Fig. 14 H) inner plate small, lacking apical seta; outer plate with 7 tooth-like spines apically; palp biarticulate, distal article slightly shorter than proximal, with 2 simple setae apically and slender acute tooth. Maxilla 2 (Fig. 14 I) inner plate medium, apical margin with 3 setae; outer plate about twice length of inner one, with 1 seta laterally and 6 setae apically. Maxilliped (Fig. 14 J) inner plate very small, with 2 unequal setae apically; outer plate large, broad, not reaching end of palp article 2, medial margin with 7 setae and 4 spine-teeth distally; palp 4 - articulate, medial margins with fine setae; article 2 elongate, 1.29 x as long as article 1, 2.30 x as long as article 3; article 4 0.45 x as long as article 3, with long claw apically. Gnathopod 1 (Fig. 14 K) coxa slender, elongate-ovate, with 1 long seta and 2 short setules apically; basis elongate, 1.22 x as long as carpus and propodus combined, curved and narrowing proximally, with 2 setae anteriorly, 1 long seta posterodistally; ischium 0.66 x as long as merus, with 1 posterodistal seta; merus with 6 simple setae posterodistally; carpus widening distally, 1.66 x as long as merus, anterior margin with 2 strong setae, with 4 simple, 3 pinnate setae ventrally; propodus subequal in length to carpus, anterior margin about twice length of posterior; palm oblique, with fine unequal setules marginally, defined by 4 spines on palmar corner; dactylus falcate, about half length of propodus, with distinct tooth on inner margin. Gnathopod 2 (Fig. 15 A) similar to gnathopod 1, but basis proximally straight not curved, carpus and propodus thin, narrower and longer than those of gnathopod 1; carpus 1.39 x as long as propodus. Pereopod 3 (Fig. 15 B) coxa subquadrate, with rounded corners, ventral margin with 4 setae; basis rectangular, subequal in length to merus – carpus combined, anterior margin with 7 long setae; merus 1.56 x as long as carpus, with long setae on both margins; carpus slightly shorter than propodus, with 6 long setae ventrally; propodus 1.46 x as long as dactylus. Pereopod 4 similar to pereopod 3. Pereopod 5 (Fig. 15 C) coxa bilobate, posterodistal lobe large, round, broadly expanded ventrally; basis subovate, somewhat pear-shaped, gradually narrowing proximally, 0.75 x as wide as long, anterior margin curved, with row of 17 short pinnate setae, posterior margin straight, with 6 fine setules; merus 1.15 x as long as and about 2.5 x as wide as carpus, with 4 pinnate setae anteriorly, 4 short pinnate setae posteriorly and 1 spine posterodistally; carpus slender, subequal in length to propodus, with 2 posteromedial and 2 posterodistal spines; dactylus falcate, about half length of propodus. Pereopod 6 (Fig. 15 D) coxa subovate, weakly bilobate, anterior lobe small, posterior lobe large, with 1 ventral setule; basis anterior margin straight, proximoposterior margin broadly expanded, narrowing strongly distally, proximal width about 2.9 x as wide as distal; merus 1.13 x as long as carpus, with pinnate setae on both margins; propodus 1.07 x as long as carpus, with 3 anteromedial setae; dactylus slender, long, 0.68 x as long as propodus. Pereopod 7 (Fig. 15 E) coxa semicircular, ventral margin broadly convex; basis anterior margin straight, greatly expanded posteriorly, 0.81 x as wide as long; merus comparatively thick, 0.57 x as wide as long, with rows of pinnate setae on both margins, spines on anterior margin, 1 spine posterodistally; carpus as long as propodus, with rows of pinnate setae, small spines on anterior margin, pinnate setae posteriorly, long slender spine posterodistally; dactylus about half length of propodus. Uropod 1 (Fig. 15 F) peduncle 1.61 x as long as outer ramus, with 2 dorsolateral, 2 dorsomedial, 2 basofacial and 1 apicomedial spine; outer ramus slightly longer than inner, with 2 apical spines of unequal length; inner ramus with 1 long spine apically. Uropod 2 (Fig. 15 G) peduncle 1.49 x as long as outer ramus, with 4 dorsolateral and 1 apicomedial spine; outer ramus slightly longer than inner, both with long spines apically. Uropod 3 (Fig. 15 H) peduncle stout, slightly longer than outer ramus, slightly shorter than inner one, with 1 distal spine; inner ramus longer than outer, with row of long pinnate setae. Telson (Fig. 15 I) gradually rounded and slightly narrowing distally, length about 1.4 x width, deeply cleft (89 %), lobes with long pinnate or penicillate setae apically and subapically.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFD9FFFCFF6DFB4FB033CC82.taxon	distribution	Distribution. Japan (Kyushu), Korea (west and south coasts).	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
1E0187ECFFD9FFFCFF6DFB4FB033CC82.taxon	discussion	Remarks. The shape of the dorsal process of urosomite 1 is a unique and characteristic feature for the genus Guernea. Our specimens are in good agreement with the original description of Hirayama (1985), as it pertains to urosomite 1. However several morphological differences are found between our specimens and Hirayama’s: 1) maxilla 1 palp biarticulate (nonarticulated in original description); 2) maxilla 2 inner lobe with 3 apical setae (2 setae in original description); 3) uropod 3 peduncle slightly longer than outer ramus, slightly shorter than inner one (peduncle shorter than rami in original description); 4) uropod 3 inner ramus slightly longer than outer (both rami equal in length in original description). These slight differences (except the biarticulate palp) are deemed insufficient to warrant the erection of a new species for our material at this time, especially as we have not examined Hirayama’s type material for the condition of the maxilla 1 palp.	en	Kim, Young-Hyo, Hendrycks, Ed A., Lee, Kyung-Sook (2011): The genus Guernea Chevreux, 1887 from Korean waters (Crustacea: Amphipoda: Dexaminidae). Zootaxa 3104: 1-25, DOI: 10.5281/zenodo.204467
