Bresilia carolina, Anker, 2025
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publication ID |
https://doi.org/10.11646/zootaxa.5660.3.10 |
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publication LSID |
lsid:zoobank.org:pub:AB5F48A6-0D53-4F0F-BDA9-ECFF3DDBF8BE |
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DOI |
https://doi.org/10.5281/zenodo.16603150 |
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persistent identifier |
https://treatment.plazi.org/id/831987C9-F441-162F-FF52-FDF6FA98FD2F |
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treatment provided by |
Plazi |
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scientific name |
Bresilia carolina |
| status |
sp. nov. |
Bresilia carolina sp. nov.
( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 )
Type material. Holotype: ovigerous female, pocl 3.35 mm, cl 5.20 mm, USNM 1522863 About USNM , USA, North Carolina, off Cape Lookout, R/V Cape Hatteras sta. CH-09-037 , 34°12’26”N / 75°51’33”W, box corer, depth: 429 m, leg. S.W. Ross et al., 5 December 2009. GoogleMaps
Description. Body moderately slender, subcylindrical, integument firm, most tegumental scales shed, represented by minute pits. Rostrum moderately slender, straight for most part, somewhat up-turned distally, about 0.6 times carapace length, distinctly overreaching distal margin of 1 st article of antennular peduncle; dorsal margin with 10 relatively small teeth, 8 anterior to orbital margin, 1 above orbital margin and 1 posterior to orbital margin; small notch demarcating reduced tooth present at some distance from posterior-most (post-orbital) tooth; all teeth fixed, not articulated; distal 1/5 of rostrum length dorsally unarmed; ventral margin armed with 2 small teeth at some distance from rostrum tip and small notch demarcating reduced subdistal tooth; lateral carina well developed, distinct from orbit throughout its length; suborbital lobe distinct, rounded, slightly protruding ( Fig. 1A–C View FIGURE 1 ).
Carapace with antennal tooth only, hepatic, branchiostegal and pterygostomial teeth absent; antennal tooth prominent, not merged with orbit ( Fig. 1A–C View FIGURE 1 ). Pterygostomial angle produced into strong, sharp tooth, latter as long as antennal spine ( Fig. 1A, C View FIGURE 1 ). Dorsal midline of carapace with small hump at about 0.8 carapace length ( Fig. 1A View FIGURE 1 ). Epistomial sclerite with strong, sharp, median process ( Fig. 1D View FIGURE 1 ). Thoracic sternum narrow; sternite 3 with mediumsized, anteriorly directed, sharp tooth; sternite 4 with low median carina; sternite 5 with pair of strong, somewhat curved, sharp teeth; sternite 6 with pair of long, narrow, distally acute processes; sternite 7 with pair of slender, finger-like, distally blunt processes; sternite 8 with single, distally rounded, median process ( Fig. 1E View FIGURE 1 ).
Pleon smooth; pleonite 3 slightly produced posteriorly without overhanging proximal margin of pleonite 4, somewhat elevated but not forming hump; pleuron 2 greatly enlarged (at least in ovigerous female); pleura 1–3 posteriorly broadly rounded, pleuron 4 with posteroventral margin armed with 2 small teeth, ventral tooth forming acute posteroventral angle, dorsal tooth situated at some distance from posteroventral angle; pleuron 5 with posteroventral angle produced into spine-like tooth; pleonite 6 with small tooth on posterolateral margin, above base of uropod; ventrolateral corner bluntly angulate ( Fig. 1A View FIGURE 1 ). Telson about 3.3 times as long as greatest width; dorsal surface with 7 pairs of small, submarginally inserted, spiniform setae; posterior margin slightly convex, furnished with 6 pairs of spiniform setae, lateral ones shortest, sublateral ones longest and stoutest, submedial ones increasing in length from centre towards sublateral ones ( Fig. 1F View FIGURE 1 ).
Eyestalks subpyriform; cornea well developed, slightly wider than eyestalk; nebenauge present, small ( Fig. 1B, C View FIGURE 1 ).
Antennular peduncle relatively slender, much shorter than scaphocerite; 1 st article longer than 2 distal articles combined; stylocerite not abutting, tapering to acute tip, reaching to distal margin of 1 st article; dorsolateral flagellum uniramous, longer than peduncle, with pairs or groups of aesthetascs on 6–14 subdivisions, distal part markedly thinner; mesial flagellum much longer and more slender than dorsolateral flagellum ( Fig. 1B, C View FIGURE 1 ). Antennal peduncle with basicerite relatively stout, armed with subacute dorsolateral tooth and strong distoventral spine; carpocerite slender, reaching past mid-length of scaphocerite; scaphocerite well developed, with broad blade, lateral margin straight, distolateral tooth well developed, falling well short of strongly convex distal margin of blade; flagellum broken ( Fig. 1B, C View FIGURE 1 ).
Mouthparts typical for genus, as illustrated ( Fig. 2A–I View FIGURE 2 ). Maxilliped 3 slender; antepenultimate article armed with 2 small spiniform setae subdistally; tip of ultimate article with several long stiff setae; exopod overreaching antepenultimate article ( Fig. 2J View FIGURE 2 ).
Pereiopod 1 in full extension overreaching distal margin of scaphocerite, with enlarged chela; articulation between basis and ischium distinct ( Fig. 1G–I View FIGURE 1 ). Ischium somewhat widening distally, distoventral angle produced into blunt lobe. Merus subcylindrical, somewhat flattened ventrally unarmed. Carpus short, cup-shaped, with blunt distomesial and distodorsal lobes; distal ventromesial surface with row of stiff setae (part of carpo-propodal brush); ventral surface with single spinule ( Fig. 1H, I View FIGURE 1 ). Chela almost as long as ischium, merus and carpus combined. Palm oval in cross-section, largely smooth, except for single spiniform seta near midpoint of flexor margin ( Fig. 1G–I View FIGURE 1 ). Fingers somewhat deflexed, deeply concave on lateral surface, with blunt tips. Pollex with cutting edge in form of sharp chitinous ridge with long row of deep fossae to accommodate flattened teeth on cutting edge of dactylus ( Fig. 1I View FIGURE 1 ). Dactylus slightly overreaching pollex; cutting edge pectinate, consisting of long row of flattened teeth, subdistal portion with excavation on lateral surface; 2 small spinule-like setae present in proximal half, above cutting edge. Exopod well developed, flagellum-like, not reaching distal margin of merus ( Fig. 1I View FIGURE 1 ).
Pereiopods 2–4 with endopods missing.Pereiopod 5 slender; ischium with 2 stout spiniform setae on ventrolateral surface; merus about 1.6 times as long as ischium, with single spiniform seta on ventrolateral surface; carpus slightly less than 0.8 length of merus, unarmed; propodus about 1.8 times as long as carpus, somewhat curved, with 3 spinules on flexor margin, 1 near mid-length, 1 between 0.8 and 0.9 of propodus length, and 1 at distoventral angle adjacent to propodo-dactylar articulation; dactylus about 0.2 times as long as propodus, curved, with long, sharp, terminal unguis, flexor margin furnished with 6 accessory spinules gradually decreasing in size from distal to proximal ( Fig. 2K, L View FIGURE 2 ).
Pleopods (not illustrated) without distinctive features; male pleopods unknown. Uropod slightly overreaching tip of telson; protopod with 2 distally pointed lobes; endopod slender, tapering distally; exopod noticeably longer than endopod, diaeresis distinct at least in its lateral section, with small lobe adjacent to stout spiniform seta, latter also flanked by small distolateral tooth ( Fig. 1J View FIGURE 1 ).
Eggs few (less than 10), ovoid in shape, large, length / width diameter approximately 1.5 / 1.2 mm.
Colour in life not recorded.
Etymology. The name of the new species derives from the Carolinas, referring to the type locality off Cape Lookout, North Carolina; used as a noun in apposition.
Distribution. North-western Atlantic: presently known only from the type locality off North Carolina, United States of America.
Ecology. Largely unknown, except for the fact that the holotype was found in a bottom sample taken by a box corer at a depth of 429 m.
Remarks. Bresilia carolina sp. nov. belongs to a small group of species within the genus combining the following characteristics: (1) third pleonite without or with a moderate dorsal hump; (2) all dorsal rostral teeth fixed, none mobile; (3) pterygostomial angle of carapace with strong sharp tooth; and (4) posterior margin of telson with more than six spiniform setae. This combination of characters is found only in two other congeners, B. atlantica Calman, 1896 (type species) and B. corsicana Forest & Cals 1977 (cf. Calman 1896; Kemp 1910; Forest & Cals 1977), and immediately eliminates B. antipodarum Bruce, 1990 (with an exaggerated dorsal hump, six spiniform setae on the posterior margin of the telson, and, in addition, without rostral tooth in postorbital position); B. plumifera Bruce, 1990 (with a strong dorsal hump on the third pleonite, and in addition, with much fewer rostral teeth); B. saldanhai Calado, Chevaldonné & dos Santos, 2004 (with a strong dorsal hump on the third pleonite and six spiniform setae on the posterior margin of the telson); B. briankensleyi Bruce, 2005 (with an exaggerated dorsal hump and, in addition, without rostral tooth in postorbital position); B. gibbosa Komai & Yamada, 2010 (with a pronounced dorsal hump on the third pleonite, posterior three rostral teeth mobile, rounded pterygostomial angle and six spiniform setae on the posterior margin of the telson); B. rufioculus Komai & Yamada, 2011 (with a rounded pterygostomial angle and six spiniform setae on the posterior margin of the telson); B. pacifica Hendrickx, 2014 (with a moderate dorsal hump on the third pleonite, slightly overhanging the base of the fourth pleonite, posterior three rostral teeth mobile, and in addition, with unarmed antepenultimate article of the third maxilliped); B. cinctus Komai & Kohtsuka, 2017 (with a strong dorsal hump on the third pleonite and rounded pterygostomial angle); B. scintilla De Grave, Wirtz & Anker, 2023 (with a rounded pterygostomial angle and six spiniform setae on the posterior margin of the telson, and in addition, with the fifth pereiopod having a much shorter carpus); as well as Bresilia sp. of Bruce (2005b) (with a strong dorsal hump on the third pleonite and several mobile dorsal teeth on the rostrum) (cf. Bruce 1990 a, 1990b, 2005 a, 2005b; Calado et al. 2004; Komai & Yamada 2010, 2011; Hendrickx 2014; Komai & Kohtsuka 2017; De Grave et al. 2023).
Bresilia carolina sp. nov. is morphologically closest to the two other deep-water Atlantic species, B. atlantica presently known only from several specimens of both sexes (however, without a single ovigerous female) dredged between 1208 m and 1423 m off Ireland ( Calman 1896; Kemp 1910), and B. corsicana described based on single female dredged from 450 m off Capraia Island in the Ligurian Sea, between Corsica and Italy ( Forest & Cals 1977). The new species can be separated from B. atlantica by the presence of 10 teeth on the dorsal margin of the rostrum (including one in postorbital position) vs. three or four teeth (including, sometimes, one in postorbital position) in B. atlantica ; the stronger and sharper pterygostomial tooth; the less pronounced dorsal hump on the third pleonite; and the much stouter dactylus of the fifth pereiopod, about three times as long as basal width vs. more than six times as long as basal width in B. atlantica (cf. Figs. 1 View FIGURE 1 , 2 View FIGURE 2 ; Calman 1896: pl. I, figs. 1–17; Kemp 1910: pl. X, figs. 1–7). The main differences between B. carolina sp. nov. and B. corsicana are the rostrum turned slightly upwards in the new species vs. rather descendent in B. corsicana ; the number of dorsal spiniform setae on the telson, seven pairs in the new species vs. five pairs in B. corsicana ; and the posterior margin of the telson faintly rounded in the new species vs. with a deep median cleft in B. corsicana . Both species have a peculiar distal excavation on the dactylus of the first pereiopod, which at the first inspection of the holotype of B. carolina sp. nov. was interpreted as a possible physical damage ( Fig. 2I View FIGURE 2 ; Forest & Cals 1977: fig. 15). Furthermore, B. carolina sp. nov. has a small mid-dorsal tubercle near the posterior margin of the carapace ( Fig. 1A View FIGURE 1 ), which is absent in all other species of the genus.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Caridea |
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