taxonID	type	description	language	source
0336445BFFE3FFC2B085FF33FC5677D5.taxon	materials_examined	Material examined Cherry Valley, Beijing Botanical Garden: five males, two females and three juveniles, 25 December 1994, collected by Dezeng Liu; 10 males and 10 females, December 1992, collected by Yixiong Cai; 12 males and eight females, 22 December 2002, collected by Chenglong Xiong. Diagnosis Gnathopod 1 with long curled setae on posterior margin of propodus; carpus and propodus of gnathopod 2 of the male with long curled setae dorsally; inner ramus of uropod 3 less than half of primary article of outer ramus, and both rami armed with simple setae, the telson with groups of long facial setae. Remarks Gammarus electrus is only known from Cherry Valley in Beijing. It can be distinguished from other Gammarus species by uropod 3 having long simple setae and gnathopod 2 having long curled setae on dorsal margins of carpus and propodus of gnathopod 2.	en	Hou, Zhong-E, Li, Shuqiang (2005): Amphipod crustaceans (Gammaridea) from Beijing, P. R. China. Journal of Natural History 39 (36): 3255-3274, DOI: 10.1080/00222930500289590, URL: http://dx.doi.org/10.1080/00222930500289590
0336445BFFE3FFC5B0E0FC3BFCF177AB.taxon	materials_examined	Material examined Zhenzhuquan Spring, Caishihe River, Yanqing County: six males and seven females, 26 August 2001, collected by Shuqiang Li and Guoqing Zhang. Badaohe River, lower reaches of Baihepu Reservoir, Yanqing County, collected by Shuqiang Li and Guoqing Zhang: 36 males, 21 females and 12 juveniles, 26 August 2001; one female, 26 August 2001; 167 males, 116 females and 35 juveniles, 7 April 2004. Maquan Spring, Shangbanquan Town, Yanqing County: 11 males and 17 females, 26 August 2001, collected by Shuqiang Li and Guoqing Zhang. Fengsui Relic, Xiabanquan Village, Yanqing County: one female, 18 May 2004, collected by Shuqiang Li and Zhong-E Hou. Guanting Reservoir, Heilongmiao Village, Yanqing County, collected by Shuqiang Li and Zhong-E Hou: one male and one female, 18 May 2004; two females, 18 May 2004; 29 males, 30 females and two juveniles, 18 May 2004; 47 males and 47 females, 18 May 2004. Beiganchi Village, Changgou Town, Fangshan District: two males, 7 December 1992; 101 males, 97 females and 28 juveniles, 15 September 2001, collected by Yuezhao Wang and Shuqiang Li. Xiganchi Village, Changgou Town, Fangshan District: 123 males, 121 females and five juveniles, 15 September 2001, collected by Yuezhao Wang and Shuqiang Li. A spring from Shidu Scenic Area, Fangshan District: 97 males, 163 females and 29 juveniles, 12 May 2000, collected by Shuqiang Li. Qingshuihe River, near Xihulin Village, Mentougou District, collected by Shuqiang Li and Kaibaryer Meng: two males and one female, 13 October 2001; six males and three females, 13 October 2001. Zhenzhu Spring: one male, September 1994, collected by Yixiong Cai. Diagnosis Body large and stout; peduncle of antenna 2 with few short setae, calceoli present in male; pereopods 3 and 4 with long straight setae on posterior margins; epimeral plates 2 and 3 with sharp posterodistal corners; inner ramus of uropod 3 reaching about 75 % of length of outer ramus, both rami set with plumose setae. Remarks	en	Hou, Zhong-E, Li, Shuqiang (2005): Amphipod crustaceans (Gammaridea) from Beijing, P. R. China. Journal of Natural History 39 (36): 3255-3274, DOI: 10.1080/00222930500289590, URL: http://dx.doi.org/10.1080/00222930500289590
0336445BFFE4FFC7B086FBFEFC6B7504.taxon	materials_examined	Material examined Beiganchi Village, Fangshan District, collected by Yixiong Cai: four males, four females and three juveniles, 7 December 1992; 92 males, 75 females and eight juveniles, 7 December 1992; 75 males and 56 females, 7 December 1992. Between Shidu and Yesanpo Scenic Area, Fangshan District: two males and one female, 12 May 2000, collected by Shuqiang Li. A sump from Baicaopang, Yesanpo Scenic Area, Fangshan District: two males and two females, 13 May 2000, collected by Shuqiang Li. A spring near Wanglaopu Village, Liudu Town, Fangshan District: eight males, 10 females and five juveniles, 24 November 2003, collected by Shuqiang Li. A spring about 2 km from the west of Baiyu Village, Mentougou District: 50 males, 41 females and 15 juveniles, 13 October 2001, collected by Shuqiang Li and Kaibaryer Meng. A sping near Shangqingshui Village, Mentougou District: 133 males, 101 females and 23 juveniles, 13 October 2001, collected by Shuqiang Li and Kaibaryer Meng. Longmen Gully, Yanjiatai Village, Mentougou District: 14 males, two females and five juveniles. Xiaolongmen Forestry Centre, Mentougou District: 42 males, 16 females and nine juveniles, 2 October 2004, collected by Yucheng Lin and Kaibayer Meng. A spring beside Longquanyu Great Wall, Yanqing County: 65 males, 33 females and 20 juveniles, 27 October 2001, collected by Kevin Li, Ye Tao and Kaibaryer Meng. Maquan Spring, Shangbanquan Town, Yanqing County: 124 males, 164 females and 30 juveniles, 26 August 2001, collected by Shuqiang Li and Guoqiang Zhang. Guanting Reservoir, Heilongmiao Village, Yanqing County: 38 males and 34 females, 18 May 2004, collected by Shuqiang Li and Zhong-E Hou. A spring at foot of hill, near Baihe Village, Changping District: six males, five females and 15 juveniles, 3 December 2001, collected by Shuqiang Li and Zhong-E Hou. Huanglou Fall, Baiyanggou, Changping District: 35 males, nine females and 30 juveniles, 20 October 2001, collected by Shuqiang Li and Zhong-E Hou. A spring of upper stream of Xiangtan Reservoir, Changping District: 220 males, 153 females and 20 juveniles, 20 October 2001, collected by Shuqiang Li and Zhong-E Hou. Huyu Spring, Changping District, collected by Yixiong Cai: five males, 4 November 1992; 12 males, 20 females and 15 juveniles, 4 December 1992. A spring of Duijiuyu Scenic Area, Changping District: 42 males and 24 females, 5 November 1992, collected by Yixiong Cai. Zhenzhu Spring, Huairou District: 123 males, 121 females and 15 juveniles, 2 June 2001, collected by Shuqiang Li. Huamu Spring, Huamu Village, Huairou District: 53 males, 25 females and 35 juveniles, 2 June 2001, collected by Shuqiang Li. Lianhuachi Spring, Yanqi Town, Huairou District: 57 males, 61 females and nine juveniles, 2 June 2001, collected by Shuqiang Li. A brook between Li Village and Detian Village, Huairou District, collected by Shuqiang Li: 39 males, 13 females and two juveniles, 26 May 2001; 109 males, 114 females and nine juveniles, 26 May 2001. A spring near Yudaohe Village, Huairou District, collected by Guoqiang Zhang: 300 males, 289 females and 75 juveniles, 26 May 2001; 20 males and 20 females, 26 May 2001. Jinglinggu, Sihetang Town, Miyun County: eight males and seven females, 1 December 1992, collected by Yixiong Cai. Sihetang Village, Miyun County: 16 males, five females and nine juveniles, 26 December 1994, collected by Yixiong Cai. Liukeyu Village, Sihetang Town, Miyun County, collected by Yixiong Cai: 52 males, 21 females and 12 juveniles, 1 December 1992; 21 males, 34 females and 10 juveniles, 1 December 1992. Xianren Fall, Huangtuliang Village, Sihetang Town, Miyun County: 54 males, 12 females and three juveniles, 30 November 1992, collected by Yixiong Cai. Huangcaowa Village, Pinggu District, collected by Yixiong Cai: 65 males and 42 females, 7 December 1992; 14 males and 10 females, 2 December 1992. Hudongshui Lake, Pinggu District, collected by Yixiong Cai: 51 males and 19 females, 2 December 1992; 13 males and seven females, 2 December 1992. Diagnosis Antennae 1 and 2 with few setae, calceoli present in male; merus to propodus of pereopod 3 with long curled setae on posterior margin; pereopods 5 – 7 with few setae on anterior margin; epimeral plates 1 – 3 with blunt posterodistal corners; inner ramus of uropod 3 reaching about 50 % of length of outer ramus, outer margin of outer ramus in uropod 3 with long simple setae only. Remarks	en	Hou, Zhong-E, Li, Shuqiang (2005): Amphipod crustaceans (Gammaridea) from Beijing, P. R. China. Journal of Natural History 39 (36): 3255-3274, DOI: 10.1080/00222930500289590, URL: http://dx.doi.org/10.1080/00222930500289590
0336445BFFE6FFC7B053FEB9FB1177A2.taxon	materials_examined	Material examined One male and one female, a well of Beizhai Village, Qiaozi Town, Huairou District, 5 November 2002, collected by Shuqiang Li. Diagnosis Eyes absent, inferior antennal sinus indistinct; pereopods 3 – 7 slender and elongate; epimeral plates 1 – 3 sub-rounded, pleonites and urosomites with fine setae on dorsal margin; uropod 3 uniramous; telson apical margin divided by a shallow excavation. Remarks	en	Hou, Zhong-E, Li, Shuqiang (2005): Amphipod crustaceans (Gammaridea) from Beijing, P. R. China. Journal of Natural History 39 (36): 3255-3274, DOI: 10.1080/00222930500289590, URL: http://dx.doi.org/10.1080/00222930500289590
0336445BFFE6FFC6B0B3FBD7FE677690.taxon	materials_examined	Material examined Fengsui Relic, Xiabanquan Village, Yanqing County, collected by Shuqiang Li and Zhong-E Hou: one female, 26 August 2001; eight males, 7 April 2004; four males, 7 April 2004; 57 males, 7 April 2004; nine males and nine females, 18 May 2004; three males and five females, 18 May 2004; 34 males, 40 females and one juvenile, 18 May 2004; three males and four females, 18 May 2004; seven males and five females, 18 May 2004; seven males and five females, 18 May 2004; 22 males and 33 females, 18 May 2004. Guanting Reservoir, Heilongmiao Village, Yanqing County, collected by Shuqiang Li and Zhong-E Hou: two males and six females, 18 May 2004; 14 males and 14 females, 18 May 2004; three males and five females, 18 May 2004. Yuanmingyuan Park: 40 males and 65 females, 25 May 2004, collected by Zhong-E Hou and Yucheng Lin. Paddyfield near Jingmiyingshuiqu River, Xibeiwang Village: 65 males and 24 females, 22 August 2000, collected by Shuqiang Li and Zhong-E Hou. River at the foot of Mt Yuquanshan: five males and five females, 22 May 2001, collected by Shuqiang Li and Zhong-E Hou. Huamu Spring, Huamu Village, Huairou District: four females, 2 June 2001, collected by Shuqiang Li. Diagnosis Left mandibular lacinia mobilis five-dentate; male gnathopod 1 with swollen carpus and propodus; gnathopod 2 powerfully subchelate; female gnathopod 2 with anteriorly broadened basis and posteriorly tumescent carpus and propodus; carpus of pereopod 4 short; outer ramus of uropod 1 marginally unarmed. Remarks	en	Hou, Zhong-E, Li, Shuqiang (2005): Amphipod crustaceans (Gammaridea) from Beijing, P. R. China. Journal of Natural History 39 (36): 3255-3274, DOI: 10.1080/00222930500289590, URL: http://dx.doi.org/10.1080/00222930500289590
0336445BFFE7FFC6B045FCE4FD8A72D9.taxon	materials_examined	Material examined Fengsui Relic, Xiabanquan Village, Yanqing County, collected by Shuqiang Li and Zhong- E Hou: one male and one female, 7 April 2004; one female, 18 May 2004. Guanting Reservoir, Heilongmiao Village, Yanqing County, collected by Shuqiang Li and Zhong-E Hou: one female, 18 May 2004; three males, four females and one juvenile, 18 May 2004; six juveniles, 18 May 2004; 35 juveniles, 18 May 2004. Heilongmiao Village, Yanqing County: one female and two juveniles, 23 April 2002, collected by Lihong Tu and Wei Chen. Beijing (10147), no detailed locality: five males and three females, 21 November 1928. Hehua Pond in the campus of Tsinghua University, Haidian: two males and two females, 14 May 1929, collected by T. Lin. Diagnosis Mandibular palp article 1 with two distal spines; inner lobes of lower lip distinct; pleonites 1 – 3 without dorsomarginal spine; uropod 3 lanceolate, inner ramus about one-third of outer ramus; telson longer than maximum basal width. Remarks Jesogammarus (J.) hebeiensis can distinguished from related Jesogammarus (J.) species by the spinose mandibular palp article 1, setose pleonites, sexually dimorphic setation in pereopods 5 – 7, and elongate telson.	en	Hou, Zhong-E, Li, Shuqiang (2005): Amphipod crustaceans (Gammaridea) from Beijing, P. R. China. Journal of Natural History 39 (36): 3255-3274, DOI: 10.1080/00222930500289590, URL: http://dx.doi.org/10.1080/00222930500289590
0336445BFFE7FFC6B045FCE4FD8A72D9.taxon	description	Jesogammarus (J.) hebeiensis and Jesogammarus (Annanogammarus) debilis sp. nov. can coexist in the same environment.	en	Hou, Zhong-E, Li, Shuqiang (2005): Amphipod crustaceans (Gammaridea) from Beijing, P. R. China. Journal of Natural History 39 (36): 3255-3274, DOI: 10.1080/00222930500289590, URL: http://dx.doi.org/10.1080/00222930500289590
0336445BFFE8FFD0B01EFF60FC8E71F3.taxon	description	(Figures 1 – 6) Type material examined One male holotye (IZCAS-I-A 0115), Beixinzhuang Village, Hebei Town, Fangshan District, 15 September 2001, collected by Yuezhao Wang and Shuqiang Li; one female allotype (IZCAS-I-A 0116) and 10 males and 12 females paratypes, same data as holotype. Other material Beixinzhuang Village, Hebei Town, Fangshan District: one male, 15 September 2001, collected by Lihong Tu. Jiudaohe Village, Fangshan District: one female, 15 September 2001, collected by Yuezhao Wang and Shuqiang Li. Beiganchi Village, Changgou Town, Fangshan District: three males and one female, 15 September 2001, collected by Yuezhao Wang and Shuqiang Li. Fengsui Relic, Xiabanquan Village, Yanqing County: 15 males, 54 females and three juveniles, 7 April 2004, collected by Shuqiang Li and Zhong-E Hou. Huamu Spring, Huamu Village, Huairou District: eight males, seven females and three juveniles, 2 June 2001, collected by Shuqiang Li. Beijing (10147), no detailed locality: 26 males and 23 females, 21 November 1928. Beijing (BJ 0141), no detailed record on the label: three males and four females. Etymology This specific name debilis alludes to the body shape, which seems slender. Diagnosis Peduncular article 1 of antenna 1 lacking a distal spine; mandibular palp articles with setae alone; propodus of male gnathopod 2 slender; propodus palmar margin of female gnathopod 2 with weakly pectinated stiff setae; outer ramus of uropod 2 marginally bare; uropod 3 with more than three plumose setae; telson longer than maximum basal width. Description Male. Body length 10.5 mm. Head as long as deep (Figure 1 A), eyes medium in size, subreniform. Antenna 1 (Figure 1 B, D): peduncular articles 1 – 3 in length ratio 1: 0.77: 0.53, peduncular article 1 lacking posterodistal spine, with distal setae, peduncular articles 2 and 3 bearing setae on posterior margin; flagellum with 26 articles, most of which with aesthetascs; accessory flagellum with five articles. Antenna 2 (Figure 1 C, E): peduncular article 4 about as long as article 5, with two to four groups of setae along anterior and posterior margins; flagellum with 14 articles, proximal nine articles with cup-calceoli. Upper lip (Figure 1 F): convex, with minute setae. Mandibles (Figure 1 G, H, O, P): left and right incisor with five and four teeth, respectively; left lacinia mobilis with four dentitions, right lacinia mobilis bifurcate; article 1 of palp unarmed, article 2 with seven marginal and nine submarginal setae, article 3 reaching 89 % of length of article 2, with two cluster of A-setae and one B-seta. Lower lip (Figure 1 I): inner lobes absent. Maxilla 1 (Figure 1 J, K, N): asymmetrical, inner plate with 16 plumose setae medially; outer plate with 11 serrated spines apically, outer margin with setules; article 2 of left palp with six spines and four setae apically; article 2 of right palp with six spines and five setae apically. Maxilla 2 (Figure 1 L): inner plate with a diagonal row of 16 plumose setae. Maxilliped (Figure 1 M): inner plate with one subapical spine and three apical spines; outer plate with 13 spines on medial margin and three pectinate setae apically. Gnathopod 1 (Figure 2 A, C, E): coxal plate lower and anterodistal margins setose, posterodistal corner with one stiff seta; anterior and posterior margins of basis setose; propodal palmar margin bearing seven inner and nine outer striated peg-spines, anterior margin with three groups of setae; dactylus with posterior accessory blade longer than nail, bearing one seta on outer margin and two setae on inner margin. Gnathopod 2 (Figure 2 B, D, F, G): coxal plate lower and anterodistal margins setose, posterodistal corner with one stiff seta; anterior and posterior margins of basis setose; propodus more slender than in gnathopod 1, palmar margin bearing eight inner and eight outer striated peg-spines; dactylus with posterior accessory blade longer than nail, bearing one seta on outer margin and two setae on inner margin. Pereopod 3 (Figures 2 H, 3 A, J): coxal plate subrectangular, anterodistal margin with two setae, posterodistal margin with one seta and one stiff seta; basis with long setae on anterior and posterior margins; merus with three groups of long stiff setae on posterior margin; carpus with spines accompanied by setae on posterior margin; propodus with four single spines accompanied by setae on posterior margin; dactylus with one plumose seta on outer margin and two setae at hinge of nail. Pereopod 4 (Figures 2 I, 3 B): coxal plate excavated on posterior margin, anterodistal margin with one seta, posterodistal margin with seven setae; basis with long setae on posterior margin; merus with three groups of stiff setae on posterior margin; carpus with one spine accompanied by setae; propodus with spines accompanied by setae; dactylus similar to that of pereopod 3. Pereopod 5 (Figures 2 J, 3 C, I): coxal plate with one distal seta on anterior lobe, posterodistal corner of posterior lobe with one spine; basis with one group of setae on anteroproximal margin, anterodistal margin spinose, posterior margin nearly straight, with stiff setae; merus to propodus with marginal spines; dactylus with one plumose seta on outer margin and one seta at hinge of nail. Pereopod 6 (Figures 2 K, 3 D): longer than pereopod 5, coxal plate with one spine on posterodistal corner; basis with one group of setae on anteroproximal margin and spines on anterodistal margin, posterior margin weakly sinuate, with a row of setae associated with short spines; merus to propodus with marginal spines; dactylus similar to that of pereopod 5. Pereopod 7 (Figures 2 L, 3 E): coxal plate with a group of long setae on anterior margin and three short setae on posterior margin; basis with two long setae on anteroproximal margin and spines on anterodistal margin, posterior margin expanded, with short spines and setae, inner surface bearing one posterodistal spine and one seta; merus to propodus with marginal spines; dactylus similar to that of pereopod 5. Coxal gills of gnathopod 2 and pereopods 3 and 4 subequal to their bases in length (Figure 2 G – I), anterior accessory lobe of each gill larger than posterior lobe, about onequarter of main gill in length. Gill of pereopod 5 (Figure 2 J) longer than basis, anterior accessory lobe larger than posterior lobe, about one-third of main gill. Gill of pereopod 6 (Figure 2 K) shorter than basis, accessory lobe about half of main gill. Gill of pereopod 7 (Figure 2 L) a little longer than half of basis, accessory lobe less than one-quarter of main gill. Pereonite 6 (Figure 4 A): posterodorsal margin bare. Pereonite 7 (Figure 4 B): posterodorsal margin with six setae. Pleonites 1 – 3 (Figure 4 C – E): posterodorsal margins with 11 marginal setae, 16 marginal setae, and 17 marginal and two submarginal setae, respectively; lateral plate 1 with about 10 long setae on anteroventral corner and six setules on posterior margin; lateral plate 2 with three anteroventral marginal spines and two submarginal spines, posterior margin with a row of seven setules; lateral plate 3 with three spines on anteroventral margin and six setules on posterior margin. Pleopods 1 – 3 (Figure 3 F – H): subequal in length, peduncle with long setae on outer margin, bearing two retinacula accompanied by three or four plumose setae on anterodistal corner; outer ramus a little shorter than inner ramus, both rami armed with plumose setae. Urosomites (Figure 4 F): urosomites 1 and 2 bearing a pair of dorsomarginal lateral spines and medial spine-clusters associated with setae; urosomite 3 with a pair of dorsomarginal lateral spines and two medial setae. Uropod 1 (Figure 3 K): basofacial spine in peduncle present or absent, outer and inner margins with two or three spines, respectively; outer ramus with three spines on inner margin; inner ramus with two spines on inner margin. Uropod 2 (Figure 3 L): peduncle with marginal spines on inner and outer margins; outer ramus marginally bare; inner ramus with one spine on outer margin and two spines on inner margin. Uropod 3 (Figure 3 M): peduncle with short setae on inner margin; outer ramus with two articles, outer margin of proximal article with one spine and two pairs of spines sequentially, inner margin with seven plumose setae and a pair of spines; terminal article distinct, 18 % of length of proximal article, longer than distal spines of proximal article; inner ramus about one-third of proximal article, with one spine and two plumose setae on inner margin, and one apical spine accompanied by one plumose seta. Telson (Figure 4 G): medially cleft for 72 % of its length, basal maximum width 90 % of length, with apical and distolateral spines. Female. Body length 8.2 mm. Gnathopod 1 (Figure 5 A, C, E, G, H): coxal plate with setae on lower and posteroproximal margins; basis with numerous long setae on anterior and posterior margins; propodus oval, bearing two spines on inner posterodistal corner and two spines on outer posterodistal corner, and five pectinate stiff setae; dactylus with posterior accessory blade shorter than nail, bearing one seta on outer margin. Gnathopod 2 (Figure 5 B, D, F, I): coxal plate with one seta on anterodistal corner and 15 setae on posterior margin; basis with setae along anterior and posterior margins; carpus and propodus slender, propodus parallel-sided, palmar margin with five simple spines on inner margin and three simple spines and two weakly pectinate stiff setae on outer margin; dactylus with posterior accessory blade shorter than nail, bearing one seta on outer margin. Pereopod 3 (Figures 5 J, 6 A): coxal plate with setae on posterior margin; basis with long setae on anteroproximal and posterior margins; merus and carpus with long stiff setae on posterior margin; propodus with spines on posterior margin. Pereopod 4 (Figure 6 B): coxal plate with setae on posterior margin; basis with long setae on posterior margin; merus with stiff setae on posterior margin. Pereopod 5 (Figure 6 C): basis with one seta on posterodistal margin of inner surface; merus to propodus spinose. Pereopod 6 (Figure 6 D): coxal plate with long setae on anterior margin; basis with two groups of setae and one posterodistal seta on inner surface. Pereopod 7 (Figure 6 E, I): coxal plate with two groups of long setae on anterior margin; basis with numerous long setae and one posterodistal spine on inner surface. Accessory gills: anterior lobe of accessory gills of gnathopod 2 and pereopod 3 much larger than posterior lobe; anterior lobe of accessory gill of pereopod 4 a little larger than posterior lobe; anterior lobe of accessory gill of pereopod 5 about one-third of main gill; accessory gill of pereopod 6 about half of main gill; accessory gill of pereopod 7 about onethird of main gill. Oostegites on gnathopod 2 to pereopod 5 progressively attenuated (Figure 4 H – K), fringed with many marginal setae. Uropod 1 (Figure 6 F): peduncle with or without basofacial spine, bearing marginal spines; outer ramus with one spine on inner margin; inner ramus with two spines on inner margin. Uropod 2 (Figure 6 G): peduncle with marginal spines; outer ramus marginally bare; inner ramus with two spines on inner margin. Uropod 3 (Figure 6 H): proximal article of outer ramus with two groups of spines on outer margin, inner margin with three plumose setae and one spine, and bearing two pairs of distal spines, reaching half of terminal article length; terminal article 23 % of length of proximal article; inner ramus 40 % of length of proximal article, with one spine and two plumose setae on outer margin. Telson (Figure 4 L): medially cleft 72 % of length, basal maximum width 87 % of length, with apical and distolateral spines. Variation Basofacial spine on peduncle uropod 1 present or absent in males and females. Remarks This subgenus contains five species: J. (A.) annandalei (Tattersall, 1922), J. (A.) naritai Morino, 1985, J. (A.) fluvialis Morino, 1985, J. (A.) suwaensis Morino, 1986, and J. (A.) koreaensis Lee and Seo, 1990. Jesogammarus (A.) debilis is closely related to J. (A.) annandalei in peduncular article 1 of antenna 1 without posterodistal spine, many setae on pleonites, and antenna 2 with short setae; it differs from J. (A.) annandalei in having bases of pereopods 6 – 7 without long setae, inner ramus of uropod 3 elongate and both rami with more plumose setae. Jesogammarus (A.) debilis can be distinguished from J. (A.) koreaensis and J. (A.) fluvialis by peduncular article 1 of antenna 1 without posterodistal spine and propodus palmar margin of female gnathopod 2 with weakly pectinate stiff setae. Jesogammarus (A.) debilis differs from J. (A.) naritai and J. (A.) suwaensis by pleonites without spines on dorsal margins. This discovery of a new Annanogammarus species from a suburb of Beijing is interesting from a zoogeographical viewpoint. It is probable that Annanogammarus has invaded from the continent, through the Korean Peninsula to Japan.	en	Hou, Zhong-E, Li, Shuqiang (2005): Amphipod crustaceans (Gammaridea) from Beijing, P. R. China. Journal of Natural History 39 (36): 3255-3274, DOI: 10.1080/00222930500289590, URL: http://dx.doi.org/10.1080/00222930500289590
