Compressidens pressum (Pilsbry & Sharp, 1897)

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 : 43

Compressidens pressum (Pilsbry & Sharp, 1897)

Figs. 86–89

+ Dentalium compressum (non Orbigny 1850): Watson 1879: 516; 1886: 9, pl. 1, fig. 9; Dall 1881: 38.

+ Dentalium pressum Pilsbry and Sharp 1897: 124 , pl. 22, figs. 50–52.

+ Dentalium (Compressidens) pressum: Henderson 1920: 83 , pl. 14, figs. 3, 6, 8; Maury 1922: 39; E merson 1952: 7; Abbott 1974: 387, fig. 4527.

+ Pulsellum (Compressidens) pressum: Kraeuter 1972: 22 , fig. 1a–f; Scarabino 1975: 181, pl. 58, fig. 883; 1985: 200, pl. 73, fig. 1026.

+ Pulsellum pressum: Cabral and Mello 1994: 40 , fig. 13.

+ Compressidens pressum: Scarabino 1994: 309 , pl. 107, fig. 1516; Steiner and Kabat 2001: 441; 2004: 633; Gracia et al. 2005: 333, fig. 8.

Type material

Holotype BMNH 1887.2.9.35.

Type locality

Culebra Island, West Indies, Challenger sta 24, 18 º38’30"N, 65º05’30"W, 714 m (by original designation).

Diagnosis

shell medium size (to 12 mm), moderately curved, strongly dorsoventrally compressed, almost subangular on lateral sides. Faint, low longitudinal riblets, mostly on dorsal side; crossed by close, sharp, irregular transversal scratches. Apex simple with a thick callus, lumem circular.

Material examined

IBUFRJ 9996, sta 25A, 2 dd; IBUFRJ 10700, sta VV24, 2 dd; IBUFRJ 10966, sta C36r, 5 dd; IBUFRJ 14271, sta R4#1, 1 dd; IBUFRJ 14272, sta 52, 6 dd; IBUFRJ 14273, sta 1f, 2 dd; IBUFRJ 14274, sta 50, 1 dd; IBUFRJ 14275, sta C35, 1 dd.

Distribution

USA: Florida (Henderson 1920; Kraeuter 1972); Colombia (Gracia et al. 2005); Brazil: Ceará (Cabral & Mello, 1994), off Recife (Kraeuter 1972; Mello 1981), Bahia to Rio de Janeiro (this study). Shells from 168 to 1431 m (Kraeuter 1972).

Remarks

Compressidens pressum is similar to C. ophiodon (Dall, 1881) , a western Atlantic species known from Florida and Caribbean Sea (Kraeuter 1972), but C. ophiodon is distinguished by the more curved and less compressed shell without the longitudinal sculpture.

Figures

FIGURES 74 – 89. Genus Gadila and Compressidens. (74 – 77) Gadila dominguensis, (74) Syntype BMNH 1854.10. 4.466, 7 mm, (75 – 76) IBUFRJ 9513, 8 mm; (77) Gadila acus, Lectotype USNM 95379, 8 mm; (78 – 80) Gadila pandionis, (78) Lectotype USNM 38644, 10 mm, (79 – 80) IBUFRJ 14314, 13 mm; (81 – 83) Gadila simpsoni, (81) Holotype USNM 161580, 7 mm, (82 – 83) IBUFRJ 14317, 5 mm; (84 – 85) Gadila pocula, IBUFRJ 14312, 10 mm; (86 – 89) Compressidens pressum, IBUFRJ 10966, 9 mm. Scale bar = 500 m.