Turbonilla halanychi, Lygre & Kongsrud & Schander, 2011

Lygre, Frøydis, Kongsrud, Jon Anders & Schander, Christoffer, 2011, Four new species of Turbonilla (Gastropoda, Pyramidellimorpha, Turbonillidae) from the Gulf of Guinea, West Africa, African Invertebrates 52 (2), pp. 243-243 : 249

Turbonilla halanychi sp. n.

Fig. 4

Etymology: This species is named in honour of Dr Kenneth M. Halanych, Auburn University. A great invertebrate phylogeneticist, and a good friend.

Diagnosis: Tall, high spired with large protoconch, slightly convex whorls, and, weakly GH¿QHG D[LDO ULEV FURVVHG E\ PLFURVWULDH.

Description: Shell tall, slender, conical or subcylindrical, white and shiny with rounded apex. Protoconch of type A-II, diameter 290 μm, semisubmerged. Whorls almost straight. Initial whorl sloping slightly to the right, giving shell a somewhat crocked DSSHDUDQFH. 6XWXUH VXSHU¿FLDO, QRWLFHDEOH REOLTXH LQ XSSHU ZKRUOV. $[LDO ULEV QRW much elevated, straight, orthocline or slightly opisthocline; tightly spaced, broader than interspaces. Ribs disappearing at periphery of ultimate whorl. Base smooth. Microsculpture consisting of spiral striae seen in interspaces and on ribs. Microsculpture continue on base. Aperture rhomboid. Columellar tooth absent. No umbilicus.

Holotype: NIGERIA: station N15, 04°01'N: 07°58'E, - 64 m ( ZMBN 86954 ). Length 2.25 mm, width 0.55 mm.

Paratypes: Four from type locality in ZMBN (86955–86958) . Three in NMSA ( L8458 / T2749 ) .

Distribution: Nigeria, Gabon and Congo, - 64– 162 m.

Comparison: This species is similar to T. bengoensis , but the protoconch is slightly larger and not as submerged. The whorls are more convex and the axial ribs broader. T. pseudomarteli has a more globular protoconch, the axial ribs are broader and a subsutural shelf is present.

Figures

Fig. 4. Turbonilla halanychi sp. n.: (A) holotype; (B) paratype, teleoconch, station N15, Nigeria; (C) paratype, protoconch, station N15, Nigeria; (D, E) paratypes, protoconchs, station N15, Nigeria; (F, G) paratypes, details of sculpture, station N15, Nigeria.