Entalina platamodes (Watson, 1879)

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 : 30

Entalina platamodes (Watson, 1879)

Figs. 60–61

+ Siphonodentalium platamodes Watson 1879: 519 ; 1886: 13, pl. 2, fig. 4.

+ Entalina platamodes: Pilsbry and Sharp 1897: 133 , pl. 23, figs. 3–5; Henderson 1920: 87, pl. 15, figs. 1, 4, 5, 7; Emerson 1952: 7, pl. 1, fig. 1; Turner 1955: 314; Warmke and Abbott 1961: 222; Abbott 1974: 390, fig. 4585; Penna­Neme 1974: 114; Scarabino 1985: 200, pl. 73, fig. 1027; 1994: 308, pl. 107, fig. 1514; Steiner and Kabat 2001: 443; 2004: 630; Gracia et al. 2005: 332, fig. 5.

+ Entalina quadrata Henderson 1920: 88 , pl. 15, figs. 2, 3, 6, 10.

Type material

Syntypes BMNH 1887.2.9.61–62, 3 dd.

Type locality

West Indies: Culebra Island, Challenger sta 24, 18 º38’30"N, 65º05’30"W, 712 m (by original designation).

Diagnosis

shell medium size (to 10 mm), markedly curved, fresh specimens translucent. Five primary ribs, secondary ribs more notorious at angles of intercostals spaces. Section pentagonal at apex, tetragonal at aperture, pre­apical callus thin.

Material examined

IBUFRJ 10032, sta A3, 4 dd; IBUFRJ 10714, sta C36r, 7 dd; IBUFRJ 10934, sta C38f, 1 dd; IBUFRJ 13784, sta 2f, 1 dd; IBUFRJ 13785, sta 5r, 4 dd; IBUFRJ 13787, sta 20, 1 dd; IBUFRJ 13788, sta 1f, 3 dd; IBUFRJ 13789, sta 517, 5 dd; IBUFRJ 13790, sta C13, 18 dd; IBUFRJ 13791, sta 25A, 31 dd; IBUFRJ 13792, sta 504, 11 dd; IBUFRJ 13793, sta 52, 455 dd; IBUFRJ 13810, sta R4#1, 8 dd; IBUFRJ 13811, sta R3#2, 11 dd; MORG 40089, sta C36r, 1 dd.

Distribution

USA: Florida (Henderson 1920; Abbott 1974); Caribbean Sea: Cuba (Turner 1955); Colombia (Gracia et al. 2005); Porto Rico (Emerson 1952); Culebra Island (Watson 1879); Brazil: off Alagoas (Penna­Neme 1974; Scarabino 1985, 1994), Bahia to Rio de Janeiro (this study). Living 290 m (Penna­Neme 1974), shells 20 to 830 m (this study).

Remarks

Henderson (1920) based his description of E. quadrata on a single specimen, which shows a tetragonal section throughout and many longitudinal riblets at intercostals spaces. Emerson (1952) studied five lots, totaling over 200 specimens of E. platamodes , and verified a variation in the degree of expression of dorsal ribs which produces shells with pentagonal and/or tetragonal sections. Our material seems to have less longitudinal riblets than the "numerous" mentioned by Emerson (1952: 8).

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.