Scalopidiidae Števčić, 2005

Ng, Peter K. L. & Castro, Peter, 2013, On the genus Scalopidia Stimpson, 1858 (Crustacea: Brachyura: Goneplacoidea: Scalopidiidae), with the description of one new genus and three new species, Zootaxa 3731 (1) : -

publication ID

https://doi.org/ 10.11646/zootaxa.3731.1.2

publication LSID

lsid:zoobank.org:pub:ECD3423E-FB05-4783-A08A-64EF16C1A57F

DOI

https://doi.org/10.5281/zenodo.6152187

persistent identifier

https://treatment.plazi.org/id/F5548796-1D4F-D86A-59BA-BE28FD43D182

treatment provided by

Plazi

scientific name

Scalopidiidae Števčić, 2005
status

 

Family Scalopidiidae Števčić, 2005 View in CoL

Diagnosis. Carapace subovate ( Figs. 2 View FIGURE 2 , 4 View FIGURE 4 A, C). Epistome longitudinally narrow, partially sunken into branchial cavity; posterior margin as prominent median triangle separated by distinct fissure, tip bilobed ( Figs. 5 View FIGURE 5 ). No endostomial ridges visible. Basal antennal article subrectangular, mobile; subsequent articles, flagellum in orbit ( Figs. 5 View FIGURE 5 ). Basal antennular article large, rectangular, mobile; in large, transverse antennular fossa; second antennal article elongated, longer than width of basal article, unable to fold into fossa ( Figs. 5 View FIGURE 5 ). Eye peduncle relatively stout, completely filling orbit, fused or mobile ( Figs. 5 View FIGURE 5 ). Chelipeds prominently unequal, heteromorphic in adult males ( Figs. 4 View FIGURE 4 B, D, 7). Ambulatory legs proportionally long; dorsal, ventral margins of first, second meri with sharp granules and/or spines; dactylus of P5 recurved ( Figs. 2 View FIGURE 2 , 4 View FIGURE 4 A, C, 8). Male thoracic sternum relatively wide, sternites 1, 2 completely fused forming triangular plate, sternite 3 separated from sternite 2 by concave suture; sternites 3, 4 fused with only lateral sutures discernible, median part depressed; sutures 4–7 medially interrupted, sternite 8 with deep longitudinal groove that does not reach suture 7/8 ( Fig. 9 View FIGURE 9 ). Sterno-abdominal cavity deep, press-button for male abdominal holding present as small rounded tubercle on posterior part of thoracic sternite 5, adjacent to suture 5/6, near edge of sterno-abdominal cavity ( Fig. 1 View FIGURE 1 ). Episternite 7 as a transversely elongated plate, covering penis as it exits coxa of P5, remaining portion of penis exposed along transverse channel or gutter, between thoracic sternites 7, 8 ( Fig. 9 View FIGURE 9 B, D, F, H). Penis coxo-sternal, long, exposed surfaces calcified to form tube ( Fig. 9 View FIGURE 9 B, D, F, H). Male abdomen T-shaped; telson subtriangular with rounded tip ( Figs. 9 View FIGURE 9 , 10 View FIGURE 10 ). G1 sinuous, with open tip, lateral surfaces lined with numerous short spinules ( Figs. 12 View FIGURE 12 A–C, E–G, 13A–C, E, F). G2 short, about a third length of G1, basal segment sinuous with dilated base, distal segment relatively short ( Figs. 12 View FIGURE 12 D, H, 13D, G). Adult female abdomen subovate, not covering entire surface of thoracic sternum; somites 1–6, telson free, separated from each other by deep clefts ( Fig. 11 View FIGURE 11 A, C, E). Female sterno-abdominal cavity relatively shallow ( Fig. 11 View FIGURE 11 B, D, F); vulvae relatively large, positioned on anterior half of somite 6 adjacent to suture 5/6, exposed without operculum or sternal vulvar cover ( Fig. 11 View FIGURE 11 B, D, F).

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