Paradentalium gouldii ( Dall, 1889 ) Dall, 1889

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 : 10

Paradentalium gouldii ( Dall, 1889) n.comb.

Figs. 6–10

+ Dentalium gouldii Dall 1889: 424 ; 1890: 295; Rios 1994: 305, pl. 105, fig. 1495; Steiner and Kabat 2004: 595; Gracia et al. 2005: pl. 1, fig. 2.

+ Dentalium (Dentalium) gouldii: Henderson 1920: 29 ; Scarabino 1975: 183 (no pl. 58, fig. 892); Scarabino 1985: 197, pl. 71, fig. 1007.

+ Dentalium (Dentalium) gouldii gouldii: Henderson 1920: 30 , pl. 2, figs 6, 7.

+ Dentalium (Dentalium) gouldii portoricense Henderson 1920: 30 , pl. 2, fig. 5; Emerson 1952: 2; Warmke and Abbott 1961: 222, fig. 34c.

+ Dentalium (Dentalium) gouldii colonense Henderson 1920: 31 , pl. 3, fig. 6.

+ Dentalium gouldii colonense: Altena 1971: 86 .

Material examined

Paralectotype MCZ 7707 of Paradentalium gouldii ; IBUFRJ 10796, sta C76, 4 dd; IBUFRJ 14297, sta A3, 1 dd; IBUFRJ 14298, sta C13, 2 dd.

Distribution

USA: South Carolina ( Dall 1889); Puerto Rico ( Henderson 1920); Surinam ( Altena 1971); Colombia ( Gracia et al. 2005); Brazil: off Amapá ( Scarabino 1994), Bahia and Espírito Santo (this study). No specimen recorded alive; shells recorded 47– 260m.

Remarks

Paradentalium gouldii shares the outline with P. americanum (Chenu, 1843) , with hexagonal section at apex and aperture, differing in having intercostal spaces longitudinally sculptured by very fine striae. One of the paralectotypes, MCZ 7707, is much eroded making it impossible to verify the longitudinal sculpture ( Fig. 6 ). Pilsbry and Sharp (1987) suggest the synonymy between P. gouldii and P. americanum , but at this moment we prefer to treat them as valid species and our specimens are identified as Paradentalium gouldii mainly because of the presence of longitudinal sculpture between ribs.

Figures

FIGURES 1 – 19. Genus Dentalium and Paradentalium. (1 – 5) Dentalium laqueatum, (1) IBUFRJ 14233, 40 mm, (2 – 5) IBUFRJ 14238, 27 mm; (6 – 10) Paradentalium gouldii, (6) Paralectotype MCZ 7707, (7 – 10) IBUFRJ 10796, 10 mm; (11 – 15) Paradentalium disparile, (11 – 13) IBUFRJ 7744, 36 mm, (14 – 15) other specimen from the same lot exibiting the apical pipe, 29 mm; (16 – 19) Paradentalium infractum, IBUFRJ 14240, 45 mm. Scale bar = 100 m.