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Splendrillia bahamasensis Fallon, 2016, new species
No full text<i>Splendrillia bahamasensis</i>, new species <p>(Plates 144, 145)</p> <p> <b>Type material.</b> Holotype 16.2 x 6.2 mm (USNM 1291354); 24 paratypes, all from the type locality: 12 spec., 20.4 x 7.8, 16.1 x 6.2, 11.7 x 5.3 & 12.6 x 5.0 mm (USNM 1291355), 14.2 x 5.6, 16.6 x 6.5, 14.0 x 6.0 & 15.1 x 6.0 mm (ANSP 464994), 15.6 x 6.2, 14.2 x 5.6, 14.4 x 5.7 & 15.9 x 6.3 mm (UF 496645), NW side of N Elbow Cay; 2 spec., 15.6 x 5.9 mm (BMSM 14994) & 15.5 x 6.1 mm (BMSM 14992), NW side of N Elbow Cay; 3 spec., 12.3 x 4.9 & 12.5 x 4.9 mm (BMSM 14993) & 14.9 x 5.6 mm (BMSM 14995), NW side of Elbow Cays; 7 spec., 6.9 x 3.2, 7.6 x 3.4 & 7.8 x 3.4 mm (DMNH 240358), 9.8 x 4.1, 12.0 x 5.0, 12.0 x 5.2 & 14.8 x 5.7 mm (MZSP 122071), NW side of Elbow Cay. All types G. Mackintosh! Jan–Feb 1996.</p> <p> <b>Type locality.</b> Elbow Cays, Cay Sal Bank, Bahama Is., at 9– 12 m.</p> <p> <b>Other material examined.</b> An additional 84 specimens were examined, all from the Bahama Is.: <i>Grand Bahama I.:</i> 1 spec., 8.6 x 4.4 mm, in 3.7–5 m, S end, Wood Cay, P. Fallon!, 13 Jul 2000 (author’s coll.); 1 spec., 10.5 x 4.6 mm, off E side of Freeport Harbor inlet, 26°31'00"N, 078°46'30"W, Worsfold! (ANSP 374479); 7 spec., 2 largest: 11.5 x 4.3 & 11.9 x 5.1 mm, on algae covered rocks Freeport Dist., West End, 26°41'N, 078°58'W, J. Worsfold!, 1981 (ANSP 355569); 1 spec., 6.6 x 2.9 mm, in beach drift, West End, Bob Quigley! 1985 (H.G. Lee coll.); 8 spec., 6 largest: 11.8 x 5.1, 12.0 x 4.6, 9.4 x 3.6, 8.5 x 3.2, 9.4 x 4.0 & 14.2 x 5.3 mm, in 0–0.3 m, Settlement Pt., 26°42'15"N, 078°59'50"W, J. Worsfold! (ANSP 368585); 1 spec., 9.4 x 4.0 mm, in 24 m, Indian Cay, 26°42'45"N, 078°39'15"W, J. Worsfold! (ANSP 366925); 14 very young specimens, 2 measured: 7.0 x 3.0 & 8.5 x 3.5 mm, in 24 m, Gold Rock, 26°30'00''N, 078°22'00''W, J. Worsfold! (ANSP 369705); 5 spec., 4.3 x 2.5, 7.5 x 3.2, 8.1 x 3.5, 8.5 x 3.8 & 9.1 x 4.0 mm, in 24 m, Gold Rock, 20 mi E of Freeport, 26°35'N, 078°22'W, J. Worsfold! 1981 (ANSP 355563); 5 spec., 6.4 x 2.6, 9.4 x 4.0, 3.8 x 2.9, 8.7 x 3.7, & 4.3 mm, in 18–38 m, Lucaya, 26°29'45"N, 078°37'15"W, Worsfold! (ANSP 368081, 368082). <i>Bimini Is.:</i> 1 spec., 12.8 x 4.8 mm, in 1.8 m, Honeymoon Cove, Gun Cay, G. Mackintosh! 26 Feb 1996 (author’s coll.); 2 spec., 13.1 x 5.4 (author’s coll.) & 12.8 x 4.9 (USNM 900130) mm, in 4 m, Honeymoon Cove, Gun Cay, G. Mackintosh! 7 Apr 1994; 7 spec., 6 measured: 14.4 x 5.4, 13.9 x 5.4, 13.0 x 5.0, 10.1 x 4.1, 11.8 x 4.9 & 11.4 x 4.3 mm, Gun Cay, Bimini Is., McGinty! 21 May 1947 (UF 155958). <i>Berry Is.:</i> 1 spec., 10.0 x 4.2 mm, in 0.9 m, Hoffmans Cay, Pat Bingham! 20 Jun 1998 (H.G. Lee coll.). <i>Exuma Cays:</i> 4 spec., 10.4 x 4.6, 10.2 x 3.9, 11.3 x 4.5 & 11.6 x 5.0 mm, Ship Channel Cay, H. Dodge! (USNM 598737). <i>Cay Sal Bank:</i> 2 spec. 11.7 x 4.9 and 14.6 x 6.2 mm, in 9.8–11 m, E side of Dog Rocks, G. Mackintosh!, 15, 22 Feb 1996 (author’s coll.); 17 spec., 11.8 x 5.1, 12.9 x 5.3, 13.7 x 5.6, 13.5 x 5.5, 12.8 x 5.4, 13.5 x 5.4, 14.4 x 5.6, 14.4 x 5.7, 15.1 x 5.8, 14.8 x 6.0, 15.7 x 5.8, 15.5 x 6.1, 15.6 x 6.4, 16.4 x 6.4, 16.5 x 6.3, 16.2 x 6.2 & 13.7 x 5.5 mm, in 10 m, W side of Dog Rocks, G. Mackintosh! 24 Feb 1996 (author’s coll.); 1 spec., 11.5 x 4.5 mm, in 11 m, Cay Sal, G. Mackintosh!, 21 Apr 1994 (author’s coll.); 6 spec., 9.5 x 4.4, 10.2 x 5.5, 14.5 x 5.9 (all decollate) & 16.6 x 6.6 (author’s coll.), 9.2 x 4.2 & 9.2 x 4.3 (USNM 900111) mm, in 9 m, NW side of Elbow Cay, G. Mackintosh! 11 Jan 1966.</p> <p> <b>Range and habitat.</b> Bahama Is. (Grand Bahama I.; Bimini Is.; Berry Is.; Exuma Cays, and Cay Sal Bank). Reported from shallow sandy bottoms and on hard surfaces in approximately 2– 24 m.</p> <p> <b> Description. <i>Shell</i></b> small (to 20.4 mm); fusiform, truncated anteriorly; glossy, whorls appressed, with sloping shoulders, convex below; body whorl large compared to the spire, 62.0% of total length. <i>Protoconch</i> paucispiral, of approximately 2 smooth round whorls, the tip of the first partially submerged; the second larger than the first. <i>Axial sculpture</i> of broad low ribs, crests of most ribs rounded anteriorly, becoming narrower near the sulcus then terminating at sulcus; evanesce on shell base. Ribs slightly oblique on early whorls, but progressively less so to body whorl; absent between the varix and edge of outer lip; about as wide as their interspaces. Ribs 8 on penultimate (6–10), 6 to varix on body whorl (4–8 on specimens with a varix). Heavy, compact growth striae cover shell surface. <i>Spiral sculpture</i> of microscopic spiral lines overall, mostly obscured by dense striae; with weak spiral ridges on the anterior fasciole. <i>Sulcus</i> broad, slightly concave, about ¼ spire whorl height, with trace swellings of reduced ribs. <i>Varix</i> broader and higher than preceding ribs, positioned about ⅓-turn from the edge of the outer lip. <i>Outer lip</i> smooth, thick, juts out somewhat and flexed inward at its edge; a slight indentation present anteriorly suggests a stromboid notch. <i>Anal sinus</i> moderately deep in mature individuals, adjoins suture near back of sinus, behind parietal callus. <i>Inner lip</i> very thin, not margined, except in old shells; erect anteriorly near tip of canal, thin on parietal wall, ends in a low callus at suture line. <i>Anterior canal</i> short but distinct, open, notched. <i>Columella</i> slightly twisted to the left anteriorly viewed ventrally; anterior fasciole slightly swollen. <i>Color</i> white with light pink to rose-colored bands mid-whorl and anteriorly; dark rose-colored streaks between ribs, and on apertural side of varix. Other forms are patterned similarly with brownish orange, or a combination of brownishorange and rose; all white forms also occur.</p> <p> <b> Remarks. <i>Taxonomy</i>.</b> <i>Splendrillia bahamasensis</i> has all the important characteristics of <i>Splendrillia</i>: a smooth sulcus, axial ribs that terminate at the sulcus, a hump-like varix located about ⅓-turn from the edge of the outer lip, and an anal sinus that adjoins the suture at its rear. It is unique among <i>Splendrillia</i> in possessing heavy growth striae. <b> <i>Variability</i>.</b> The average length of 85 specimens is 12.24 mm (3.8–20.4 mm); the average W/ L ratio of 54 measured specimens is 0.413. Although color varies, no geographic pattern in the occurrence of pink or brownish orange forms could be discerned. All-white (dingy white) forms are rare. <i> <i>Identification.</i> Splendrillia bahamasensis</i> is commonly misidentified as <i>S. coccinata</i> (Reeve, 1845) by collectors and in museum collections; perhaps hampered by the absence of a published photograph of a <i>S. coccinata</i> type. Authors including the Bahama Is. in the range of <i>S. coccinata</i> have probably misidentified this species; the occurrence of verified specimens of <i>S. coccinata</i> is limited to the lower Lesser Antilles (see description of <i>S. coccinata</i>). <i>Splendrillia bahamasensis</i> is most easily distinguished from its congeners by its heavy growth striae. It also differs from <i>S. coccinata</i> by its larger maximum total length (20.4 versus 10.0 mm), straighter and fewer ribs. <i>Splendrillia bahamasensis</i> is also larger than <i>S. interpunctata</i> (largest 20.4 versus 16.5 mm). The ribs of <i>S. interpunctata</i> are narrower, more oblique, and sharper at their crests. While growth striae are noticeably present in <i>S. interpunctata</i>, they are not as dense so the shell still appears translucent, which is not the case for <i>S. bahamasensis</i>.</p> <p> <b>Etymology.</b> The Bahamas <i>Splendrillia</i>. Named for the country of the type locality and where all specimens reported here have been found.</p>Published as part of <i>Fallon, Phillip J., 2016, Taxonomic review of tropical western Atlantic shallow water Drilliidae (Mollusca: Gastropoda: Conoidea) including descriptions of 100 new species, pp. 1-363 in Zootaxa 4090 (1)</i> on pages 283-287, DOI: 10.11646/zootaxa.4090.1.1, <a href="http://zenodo.org/record/263299">http://zenodo.org/record/263299</a>
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