Cadulus nerta, Caetano, Carlos Henrique Soares, Scarabino, Victor & Absalão, Ricardo Silva, 2006

Caetano, Carlos Henrique Soares, Scarabino, Victor & Absalão, Ricardo Silva, 2006, Scaphopoda (Mollusca) from the Brazilian continental shelf and upper slope (13 º to 21 ºS) with descriptions of two new species of the genus Cadulus Philippi, 1844, Zootaxa 1267, pp. 1-47 : 36

Cadulus nerta n.sp.

Figs. 72–73

Type material

Holotype IBUFRJ 14314; Paratypes MNHN, 1 dd; MORG 41078, 1 dd. All specimens from the type locality.

Type locality

Espírito Santo, REVIZEE sta A3, 18 º58’53’’S, 37º51’06’’W, 247 m.

Distribution

Western Atlantic, Brazil: only know from type locality. Shells to 247m.

Etymology

nerta is a nordic goodness of nature.

Description

Shell small (to 3.0 mm long), glossy, translucent, inflated, regularly curved except by a slope in posterior end at ventral side. Maximum diameter close to center of shell. Ventral side regularly curved, contracted into short apical slope, dorsal side notably less curved with small bulge at maximum diameter. Dorsal view fusiform, constriction observed between the preapical callus and apex. Apex simple with dorsoventrally depressed section. Preapical callus thin, lumen oval dorsoventrally. Oral aperture very oblique, strongly laterally compressed.

Remarks

Cadulus nerta does not closely resemble any other Brazilian species of the genus. Compared with the North Atlantic Cadulus podagrinus Henderson, 1920 , it is less inflated, smaller and has a more laterally compressed apertural section.

Figures

FIGURES 57 – 73. Genus Episiphon, Entalina, Polyschides and Cadulus. (57) Episiphon didymum, IBUFRJ 14310, 7 mm; (58 – 59) Episiphon sowerbyi, IBUFRJ 14250, 8 mm; (60 – 61) Entalina platamodes, IBUFRJ 13793, 10 mm; (62 – 63) Polyschides portoricensis, IBUFRJ 10576, 7 mm; (64 – 65) Polyschides tetraschistus, (64) Holotype BMNH 1887.2. 9.66, 7 mm, (65) IBUFRJ 14280, 6 mm; (66 – 69) Cadulus parvus, (66) Holotype USNM 314713, 5 mm, (67 – 69) IBUFRJ 9858, 5 mm; (70 – 71) Cadulus eliezeri n. sp., Holotype IBUFRJ 10810, 3 mm; (72 – 73) Cadulus nerta n. sp., Holotype IBUFRJ 14314, 3 mm. Scale bar = 50 m.