Graptacme calamus (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 : 19-20

Graptacme calamus (Dall, 1889)

Figs. 39–43

+ Dentalium calamus Dall 1889: 421 .

+ Dentalium (Graptacme) calamus : Henderson 1920: 72, pl. 12, figs. 7,8; Warmke and Abbott 1961: 222, fig. 34h; Penna 1972: 230; Abbott 1974: 386, fig. 4519; Penna­Neme 1974: 112; Scarabino 1975: 184, pl. 59, fig. 904.

Fustiaria (Laevidentalium) perlongum (non Dall 1881): Scarabino 1973: 197 (in part). + Graptacme calamus: Scarabino 1985: 198 , pl. 72, fig. 1016; 1994: 307, pl. 106, fig. 1504; Cabral

and Mello 1994: 36, figs. 6,7; Redfern 2001: 190, pl. 76, fig. 780; Steiner and Kabat 2004: 572. + Graptacme calama : Steiner and Kabat 2001: 446.

Diagnosis

Shell to 23 mm length, regularly tapering, translucent ashy white. Shell surface covered by fine, equal longitudinal striae. Apex oblique, internal wall of the lumen protrude, forming an apical plug with an irregular slit sagitally disposed. Apical, oral sections circular.

Material examined

Lectotype of Graptacme calamus ; IBUFRJ 14231, sta VV16, 10 dd; IBUFRJ 14232, sta 51, 5 dd; MORG 39632, sta VV16, 3 dd.

Distribution

USA: North Carolina, Florida (Henderson 1920; Abbott 1974); Caribbean Sea: Cuba; Puerto Rico; Brazil: Amapá to Rio Grande do Sul (Penna 1972; Penna­Neme 1974; Scarabino 1975, 1985, 1994). Living 17 to 124 m.

Remarks

Four species of the genus Graptacme were recorded from Brazilian waters (Scarabino 1994): G. c a l a m u s, G. eborea (Conrad, 1846) , G. perlonga and G. semistriolata . Within these, only G. eborea was absent in the material obtained in REVIZEE program expeditions. The plug­shaped apex, even if variable in outline, and the length of the slit ( Figs. 42 and 43 ), together with the presence of the striae in the whole shell surface easily distinguish G. calamus from the others species of the genus.

Figures

FIGURES 39 – 56. Genus Graptacme and Fustiaria. (39 – 43) Graptacme calamus, (39 – 40) Lectotype USNM 68117, 19 mm, (41 – 43) IBUFRJ 14232, 18 mm; (44 – 45) Graptacme perlonga, IBUFRJ 13866, 61 mm; (46 – 47) Graptacme semistriolata, IBUFRJ 14247, 35 mm; (48 – 52) Fustiaria liodon, (48) Holotype ANSP 35554, 25 mm, (49 – 52) IBUFRJ 14252, 30 mm; (53 – 56) Fustiaria stenoschiza, (53 – 54) Syntype ANSP 71081, 35 mm, (55 – 56), IBUFRJ 10587, 26 mm.