Choniognathus spinosus, Forges & Lee & Ng, 2021
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publication ID |
https://doi.org/ 10.11646/zootaxa.5048.3.1 |
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publication LSID |
lsid:zoobank.org:pub:951BE302-C0BF-4AA3-AE12-BBAC4EDEBAFB |
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DOI |
https://doi.org/10.5281/zenodo.5569406 |
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persistent identifier |
https://treatment.plazi.org/id/03B187B7-FF96-FFB8-89B3-A3B8FE6F5DB4 |
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treatment provided by |
Plazi |
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scientific name |
Choniognathus spinosus |
| status |
sp. nov. |
Choniognathus spinosus View in CoL n. sp.
( Figures 1A View FIGURE 1 , 6A–F View FIGURE 6 )
Material examined. Holotype: ovigerous female (cl 10.2 mm, pcl 9.5 mm, cw 8.3 mm, bcw 7.3 mm) (MNHN-IU-2008-10297), stn CP3132, Mozambique Channel, 2511’S 3501’E, 101–102 m, coll. MAINBAZA, 10 April 2009.
Diagnosis. Dorsal surface of carapace covered with numerous prominent spines and sharp tubercles; with stiff scattered setae, without dense tomentum which completely covers surface ( Fig. 6A, B View FIGURE 6 ). Pseudorostral spines short, strongly diverging ( Fig. 6A, B View FIGURE 6 ). Supraocular eave broad with concave margin lined with 2 or 3 spines, not completely covering eye ( Fig. 6B View FIGURE 6 ); postocular spine longer than preocular tooth on eave, with short intercalated spine totally filling space between them ( Fig. 6B View FIGURE 6 ). Hepatic spine long, oriented outwards ( Fig. 6B View FIGURE 6 ). Gastric area raised, with numerous granules, with 2 tubercles on top; cardiac area raised, covered by prominent granules, with 5 posterior granules tuberculiform, forming blunt spines ( Fig. 6B, C View FIGURE 6 ); branchial area inflated covered with spines, 2 of them longer ( Fig. 6B View FIGURE 6 ). Posterior carapace margin with 3 rows of long granules like-spines ( Fig. 6B View FIGURE 6 ). Basal antennal article with 4 spines distally, base appressed against infraorbital margin with 2 long spines ( Fig. 6D View FIGURE 6 ). Buccal frame quadrangular, completely covered by third maxillipeds ( Fig. 6D, E View FIGURE 6 ). Third maxilliped with merus and ischium covered by scattered tubercles, merus separated from ischium by suture, structures mobile; anteroexternal angle of merus strongly produced, auriculiform ( Fig. 6D, E View FIGURE 6 ). Cheliped short, dorsal margins and outer surfaces of carpus, merus and chela covered by spines and stiff setae; cutting margins of fingers finely serrulate ( Fig. 6E, F View FIGURE 6 ). Ambulatory legs short, setose ( Fig. 6A View FIGURE 6 ). Pleon with 6 free somites and telson, somite 1 with large median swelling covered by tubercles and granules ( Fig. 6B, C View FIGURE 6 ).
Type locality. Mozambique Channel
Etymology. The name spinosus alludes to the spiny carapace and pereopods of the species.
Remarks. Choniognathus spinosus n. sp. has several unusual features that question its placement in the genus. It differs from the type species, C. reini , in the following characters: the pseudorostral spines are clearly divergent ( Fig. 6A View FIGURE 6 ) (versus directed anteriorly and subparallel in C. reini ; Fig. 7A, C, E View FIGURE 7 ); the supraorbital eave is more expanded with a spinous margin ( Fig. 6A, B View FIGURE 6 ) (versus narrow with the margin entire in C. reini ; Fig. 7A, C, E View FIGURE 7 ); the postocular spine is as long as than the preocular eave tooth, with the intercalated spine totally covering space ( Fig. 6B View FIGURE 6 ) (versus postocular spine is distinctly shorter than the preocular eave tooth with the intercalated spine separated from the eave and postorbital spine by narrow clefts ( Fig. 7A, C, E View FIGURE 7 ); the merus and ischium of the third maxilliped are mobile ( Fig. 6D View FIGURE 6 ) (versus fused in C. reini with the suture very shallow or undiscernible in C. reini ; Fig. 13G, H View FIGURE 13 ); the anteroexternal angle of the merus of the third maxilliped is strongly produced ( Fig. 6D View FIGURE 6 ) (versus lower in C. reini ; Fig. 13G, H View FIGURE 13 ); and the outer surface of the merus, carpus and chela are covered with prominent spines ( Fig. 6A, E, F View FIGURE 6 ) (versus almost smooth in C. reini ; Fig. 7D View FIGURE 7 ). In addition, while C. reini and C. granulosus (cf. Baker 1906: 108) have short ambulatory legs with all the dorsal surfaces of the carapace and pereiopods completely covered by a short dense tomentum ( Fig. 7E View FIGURE 7 ), this is not the case with C. spinosus n. sp., the carapace and pereopods are just covered with short stiff setae, which while dense, do not completely obscure the outline and surfaces like the other two species ( Fig. 1A View FIGURE 1 ).
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.