Fenimorea tartaneata, 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 : 204-205

Fenimorea tartaneata , new species

( Plate 98 )

Type material. Holotype 22.6 x 10.0 mm, R. Masino! (USNM 1291351); 1 paratype: 29.0 x 11.8 mm, off Bayman's Bay Resort, Guanaja I., Honduras, diver-collected, 1983 (EFG 6714).

Type locality. Trujillo Bay, 15°57'57"N, 086°01'44"W, in 20 m.

Range and habitat. Known only from Honduras. Reported from 20 m on soft sand.

Description. Shell medium (incompletely developed specimens to 29.0 mm in total length), broadly fusiform, truncated anteriorly, with convex whorls; whorls number up to 10½ including the protoconch of what are juvenile type specimens, the last approximately 61% of total length. Sculpture of axial ribs. Aperture oval, anterior canal short. Protoconch of approximately 2 smooth round whorls. Axial sculpture of straight, broad, round ribs that are wider than their interspaces, reduced abruptly at the sulcus where they are low, narrowed, and curved with ridged crests, not round crests as on the whorl proper. Ribs evanesce on shell base; number 11 on the penultimate, 13–14 on last whorl. Varix not present on the incompletely developed type specimens. Spiral sculpture of well-spaced grooves forming overlapping bands with raised edges on their abapical side; more closely spaced fine grooves in sulcus, without raised edges in sulcus; grooves intersected by fine growth striae with depressions or “pits” visible between striae, the typical microsculpture of Fenimorea . Sulcus concave; rib crests ridged, and ribs and striae recurved in the sulcus to reflect the outline of anal sinus. Outer lip thin, smooth, without scalloping, without a stromboid notch in the juvenile types. The outer lip bends along the anterior canal. Anal sinus incompletely developed in specimens in hand; only a thin-lipped, shallow notch below the suture. Inner lip narrow, erect along anterior canal, recumbent and margined in parietal area; no parietal callus present in these juvenile specimens. Anterior canal short but well defined, open; anterior fasciole slightly swollen with 5–6 spiral grooves. Color white with a wide golden brown spiral band mid-whorl that darkens toward its bottom edge and two narrower bands below, these latter only visible on last whorl; narrow golden brown stains present between the ribs extend to the shoulder.

Remarks. Taxonomy. Although fully developed lips are absent from the specimens in the type series, Fenimorea tartaneata has the characteristic shell microsculpture of the genus and ribs that extend from suture-tosuture that are modified in the sulcus. Variability. The average total length of two specimens is 25.8 mm (22.6–29.0 mm), and their average W/L is 0.425. They are not fully developed; that is, a varix and deep anal notch are not present. Identification. This species is similar to four other large, colorful Fenimorea : F. janetae Bartsch, 1934 , F. sunderlandi (Petuch, 1987) , F. kathyae Tippett, 1995 , and F. tessellata , new species. From F. janetae it differs in possessing broader ribs that are round-crested, not ridged (compare apical views of the two species), a last whorl that is rounder, not as evenly tapered, a broader shell (average W/ L ratio = 0.425 versus 0.384), and a different color pattern. The central color band is not a solid color as in F. janetae . From F. sunderlandi it differs in possessing broader ribs that are straight, not oblique, a broader shell (average W/ L ratio = 0.425 versus 0.384) and in having a different color pattern. From F. kathyae it differs in having a broader shell (average W/ L ratio = 0.425 versus 0.384), and a different color pattern. From F. tessellata it differs in possessing fewer and broader ribs that are round-crested, not ridged, a broader shell (average W/ L ratio = 0.425 versus 0.384), and a different color pattern. The two specimens of F. t ar t an e a t a are unique for a combination of characteristics not observed in any of the specimens of its closest congeners: a short spire (the largest W/ L ratio ), the deep spiral grooves (the others have smoother surfaces), and a color pattern unlike the others, which is for the most part fairly uniform within species. For these reasons it merits description as new.

Etymology. The Tartan-clad Fenimorea . The color pattern of varying–width bands and vertical stripes suggest a tartan cloth “skirt” draped down from around its periphery, or “hips”.

Figures

PLATE 98. Fenimorea tartaneata, new species. Figs. 1, 3: holotype, Trujillo Bay, Honduras (USNM 1291351). Fig. 1: ventral, lateral & dorsal views; Fig. 3: apical view, L = edge of outer lip; Fig. 2: enlarged view of protoconch of specimen in Fig. 4 (not to scale); Fig. 4: paratype, off Guanaja I., Honduras (EFG 6714).