Fenimorea glennduffyi, Fallon, Phillip J., 2016

Fallon, Phillip J., 2016, Taxonomic review of tropical western Atlantic shallow water Drilliidae (Mollusca: Gastropoda: Conoidea) including descriptions of 100 new species, Zootaxa 4090 (1), pp. 1-363 : 173-174

Fenimorea glennduffyi , new species

( Plate 81 )

Type material. Holotype 10.8 x 4.7 mm (UF 470307); 5 paratypes: 2 spec., 10.2 x 4.2 & 10.4 x 4.4 mm, from the type locality, G. Duffy! Apr 1985 (UF 470308); 2 spec., 11.9 x 4.9 & 11.8 x 4.8 mm, in 1.2 m, ca. 1.6 km E of Salinas Point, SW of Bani, Dominican Republic, E. García! Jan 1986 (EFG 7855); 1 spec., 11.5 x 4.8 mm, in 0.9– 1.2 m, Las Salinas, Dominican Republic, G. Duffy! 15 Oct 1994 (USNM 1146305).

Other material examined. One all-white spec., 9.6 x 4.5 mm, in 0.9–1.2 m, Las Salinas, Dominican Republic, G. Duffy! 15 Oct 1994 (USNM 1146597).

Type locality. Las Salinas, Dominican Republic, at 0.6–1.2 m.

Range and habitat. Dominican Republic (Las Salinas and vicinity). Reported live-taken from shallow water at 0.6–1.2 m.

Description. Shell small (to 11.9 mm in total length), fusiform, anterior truncated, up to 8¼ slightly convex whorls, the last approximately 63% of total length; sculpture of axials, aperture narrowly oval. Protoconch of approximately 1¾–2 smooth round whorls. Axial sculpture of low narrow ribs that extend from suture-to-suture on spire whorls, evanesce just below periphery on last, number 11–12 on penultimate, 6–8 on last whorl. Ribs highest on shoulder, greatly reduced and slightly recurved in sulcus, then greatly reduced below periphery such that they appear almost knob-like. Varix low, broad and hump-like, about ⅓-turn from the edge of the outer lip. Spiral sculpture of microscopic threads and more widely space shallow grooves. The threads are intersected by growth striae of about equal strength producing the typical pattern of aligned microscopic “pits”; grooves end in dimples or projections at outer lip’s edge. Sulcus about ⅓-whorl height, ribs convex; microsculpture present. Outer lip thin, flattened from varix, with several very low axial folds; edge of lip forms a flat arc from anal sinus to anterior canal; stromboid notch faint. Anal sinus a U-shaped notch near suture, entrance slightly constricted by parietal lobe. Inner lip narrow, recumbent, margined, pinched up on anterior canal, very thin on parietal wall, and formed into a lobe at anal sinus. Anterior canal short, open, notched; fasciole not swollen. Color off white with a central brown spiral band, a spiral band of intermittent brown patches in sulcus and over shoulder, and a large brown patch on varix.

Remarks. Taxonomy. Fenimorea glennduffyi has all the diagnostic characteristics of Fenimorea : ribs sutureto-suture but greatly reduced in the sulcus, microsculpture of very fine spiral threads and growth striae that show intervening pits and a large hump-like varix about ⅓-turn from the edge of the outer lip. Variability. The six type specimens have an average total length of 11.10 mm (10.2–11.9 mm) and an average W/ L ratio of 0.418. Nearly all-white forms occur (faint color appears on the varix). Identification. Fenimorea glennduffyi is closest to F. caysalensis , new species. It differs from that species in possessing shouldered whorls and fewer ribs (11–12 versus 12–16 on the penultimate whorl). An all-white form of F. glennduffyi (Fig. 8) originally from the same lot as the one depicted in Fig. 7 is very similar to F. ni v al i s, new species, of Brazil, but differs principally in possessing fewer ribs that are broader and have rounder crests. Fenimorea glennduffyi is also similar to F. biminensis , new species. It differs in being slightly more stout (W/L = 0.418 versus 0.395), and in possessing a narrow, not the wide, central spiral band of F. biminensis .

Etymology. Glenn Duffy’s Fenimorea . Named in honor of Mr. Glenn Duffy for his contribution of mollusks from the Dominican Republic for scientific study.

Figures

PLATE 81. Fenimorea glennduffyi, new species. Upper panel. Figs. 1 – 2: holotype, Las Salinas, Dominican Republic (UF 470307). Fig. 1: ventral, lateral, and dorsal views; Fig. 2: apical view, V = varix, L = edge of outer lip. Lower panel. Figs. 3 – 7: paratypes, all from the Dominican Republic. Figs. 3 – 4: Las Salinas (UF 470308); Figs. 5 – 6: E of Salinas Point (EFG 7855); Fig. 7: Las Salinas (USNM 1146305); Fig. 8: Las Salinas (USNM 1146597).