Taxonomic study on the molluscs collected in Marion-Dufresne expedition (MD 55) to SE Brazil: Xenophoridae, Cypraeoidea, mitriforms and Terebridae (Caenogastropoda)
Simone, Luiz Ricardo L.
Cunha, Carlo M.
Zoosystema
2012
2012-12-31
34
4
745
781
[858,1029,1514,1541]
Gastropoda
Velutinidae
Lamellaria
Animalia
Littorinimorpha
6
751
Mollusca
species
undetermined
( Fig. 3G, H)
MATERIAL EXAMINED. — Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 18°59’S, 37°48’W, 607- 620 mdepth, MNHN, 1 shell ( MD55, stn DC73, Bouchet, Leal & Métivier coll., 27. V.1987).— Off Regência, 19°40’S, 37°48’W, 790-940 mdepth, MNHN,1 shell (stn CB77). — Off Conceição da Barra, 18°59’S, 37°47’W, 1540-1550 mdepth, MNHN, 3 shells (stn CD70, 26. V.1987).
MEASUREMENTS (in mm). — MNHN (stn DC73): 3.7 × 2.7.
DISCUSSION ON LAMELLARIIDS Typical shells of Lamellariawere collected in the three above-mentioned stations. However, nothing more precise than the generic attribution is possible, as the identification of lamellariid species, only based on the vestigial shells, is complicated. Anyway, the shells of the three lots appear to belong to different species. Those of the MNHN lot (stn DC73) are more rounded and with a thicker-walled shell ( Fig.3G, H). The shell of the MNHN lot(stn DC77) is more elongated and thinner-walled. And the shells of the MNHN lot (stn DC70) are oval, with a wider aperture, and possess delicate transverse undulations on the last whorl. The first indication is that the three lots may represent different species, which only can be defined with additional samples. Family PEDICULARIIDAE Gray, 1853