Gadila dominguensis (Orbigny, 1853)

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 : 37-39

Gadila dominguensis (Orbigny, 1853)

Figs. 74–76

+ Cadulus dominguense Orbigny 1853: 201 , pl. 25, figs. 7–9; Gray 1854: 34.

+ Cadulus acus Dall 1889: 432 , pl. 27, fig. 11; Dall and Simpson 1901: 457; 1903: 78.

+ Cadulus (Gadila) acus: Pilsbry and Sharp 1898: 191 , pl. 36, fig. 27; Henderson 1920: 140, pl. 20, fig. 11; Warmke and Abbott 1961: 221, fig. 34d; Penna­Neme 1974: 115; Scarabino 1975: 182, pl. 52, fig. 886; 1985: 201, pl. 73, fig. 1030.

+ Cadulus (Gadila) dominguensis: Pilsbry and Sharp 1898: 191 , pl. 36, fig. 26; Henderson 1920: 141, pl. 20, fig. 3; Scarabino 1985: 201, pl. 73, fig. 1029.

+ Cadulus (Gadilopsis) acus: Emerson 1952: 10 ; Abbott 1974: 390, fig. 4576.

+ Cadulus domingensis (sic): Matthews and Rios 1974: 47.

+ Cadulus (Gadila) dominguense: Penna­Neme 1974: 116 .

+ Gadila dominguensis: Scarabino 1975: 182 , pl. 58, fig. 885; 1994: 309, pl. 107, fig. 1519; Steiner and Kabat 2004: 585.

+ Gadila acus: Díaz and Puyana 1994: 257 , pl. 71, fig. 1052; Scarabino 1994: 309, pl. 107, fig. 1518; Steiner and Kabat 2001: 445; 2004: 558; Absalão and de Paula 2004: fig. 1a; Absalão et al. 2005: 177, fig. 1.

+ Gadila dominguense: Steiner and Kabat 2001: 445 .

Type material

Syntypes BMNH 1854.10.4.466, 5 dd.

Type locality

" Saint­Domingue [ Dominican Republic]; Martinique; Saint­Thomas; Cuba " (by original designation).

Diagnosis

Shell small to medium (to 11 mm), slender, slightly curved, maximum diameter near oral aperture. Circular wrinkles in apical region, remainder of shell smooth. Apex simple, aperture slightly oblique. Section circular throughout.

Material examined

Syntypes of Gadila dominguensis ; Lectotype of G. acus USNM 95379 (designated by Henderson, 1920: 140); IBUFRJ 9649, sta C65, 1 dd; IBUFRJ 9513, sta 16, 3 dd; IBUFRJ 9997, sta 48, 3 dd; IBUFRJ 12854, sta C76, 30 dd.

Distribution

USA: Florida (Henderson 1920; Abbott 1974); Caribbean Sea: Porto Rico (Henderson 1920; Emerson 1952); Honduras; Guatemala; Belize (Henderson 1920); Colombia (Díaz & Puyana 1994); Cuba; St. Thomas; Martinique; Dominican Republic (Orbigny 1853; E merson 1952); Suriname (Altena 1971); Brazil: Amapá to Bahia (Scarabino 1975, 1994), Espírito Santo (this study). Living 53 to 103 m (Penna­Neme 1974), shells from shore to 100 m (this study).

Remarks

Henderson (1920: 141) already mentioned that Gadila acus and G. dominguensis were closely allied species but he retained both species until a comparison with the types could be done. As show in Figures 74 and 77 , the types of G. dominguensis and G. acus , respectively, are not sufficiently different to justify these two species. The shared characteristics include general elongate slender form, equator situated immediately posterior of the anterior aperture and presence of circular wrinkles at the apical region. Gadila acus is considered here a junior synonym of G. dominguensis . Steiner and Kabat (2004) noted a questionable record of G. dominguensis from the West African coast by Nicklès (1979: 64, fig. 21). Considering the shell profile of Nicklès´s sketch we agree with Steiner and Kabat (2004).

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.