Egila, Dall & Bartsch, 1904

Pimenta, Alexandre D. & Absalão, Ricardo S., 2004, Review of the genera Eulimastoma Bartsch, 1916 and Egila Dall & Bartsch, 1904 (Mollusca, Gastropoda, Pyramidellidae) from Brazil, Zoosystema 26 (2), pp. 157-173 : 170-171

“ Egila ” ektopa n. sp.

( Fig. 6 E-H)

TYPE MATERIAL. — Holotype: REVIZEE, stn VV38, 19°44’S, 38°22’W, 71.4 m, Astro Garoupa, 29.II.1996 ( MNRJ 10255 ); paratypes: 1 spec., same locality ( MNHN); GEOMAR XII, stn 95, 1 spec. ( IBUFRJ 7800 ).

TYPE LOCALITY. — Off Espírito Santo State, Brazil, REVIZEE, stn VV38, 19°44’S, 038°22’W, 71.4 m.

DIAGNOSIS. — Shell conical with a rounded suprasutural spiral cord and axial ribs with well rounded upper summits and disappearing towards the lower part of the whorl; base smooth with a very distinct small chink-like umbilicus; columellar fold very prominent. ETYMOLOGY. — From the Greek ektopos: out of place, displaced, strange, an allusion to our incertainty about the generic allocation of this species.

DISTRIBUTION. — SE coast of Brazil (Espírito Santo and Rio de Janeiro states).

DESCRIPTION

Shell white, conical with rectilinear whorls. Holotype with 2.0 mm in length. Protoconch intorted, sunken into first teleoconch whorl. Sutures almost perpendicular to main shell axis, somewhat deep; with a rounded suprasutural spiral cord. About 20 orthocline axial ribs disappearing towards the lower part of the whorl; upper summits of the ribs well rounded, given a waved appearance to the suture above it. Base slightly convex, smooth with a very distinct small chinklike umbilicus. Aperture rhomboid, angulated in the middle. Outer lip thin. Columellar fold very prominent.

REMARKS

Our choice to include this species in Egila is based on some general similarities with “ Egila ” virginiae . However, as discussed earlier, the generic placement is tentative. As with “ Egila ” virginiae , “ Egila ” ektopa n. sp. does not conform to some of the diagnostic characters of Egila , especially the peripherical groove and the presence in “ Egila ” ektopa n. sp. of a rounded subsutural cord at which the axial ribs stop ( Fig. 6E, F ).

“ Egila ” ektopa n. sp. can be easily distinguished from “ Egila ” virginiae based on its trigonal shell shape ( Fig. 6E ), orthocline axial ribs ( Fig. 6E ),

Eulimastoma and Egila (Mollusca, Gastropoda) from Brazil strong rounded keel at periphery ( Fig. 6F ), base slightly rounded and presence of columelar fold ( Fig. 6E ), while “ Egila ” virginiae ( Fig. 6 A-D) shows elongate shell shape, opisthocline axial ribs, no keel at periphery of body whorl, well rounded base and absence of columelar fold.

Figures

FIG. 6. — A-D, “Egila” virginiae Altena, 1975; A, MNHN; B-D, MMUFRPE; A-C, whole shells, respective lengths: 3.65 mm, 1.78 mm; 1.52 mm; D, protoconch; E-H, “Egila” ektopa n. sp.; E-G, holotype (MNRJ 10255); E, whole shell, length 2.00 mm; F, last whorl; G, protoconch; H, protoconch of paratype (IBUFRJ 7800). Scale bars: 100 µm.