Turbonilla kamayura, S, Absalão, Ricardo Silva, Santos, Franklin Noel & Oliveira, Deusinete, 2003

S, Absalão, Ricardo Silva, Santos, Franklin Noel & Oliveira, Deusinete, 2003, Five new species of Turbonilla Risso, 1826 (Gastropoda, Heterobranchia, Pyramidellidae) found off the northeast coast of Brazil º­ 13 º, Zootaxa 235, pp. 1-11 : 5-7

Turbonilla kamayura n. sp. ( Fig. 8­10 )

Description: Shell small, slightly conical to subcylindrical; semitransparent. Teleoconch whorls strictly convex. Suture shallow, oblique. Protoconch heterostrophic helicoidal; diameter 222 m in holotype. With 10 teleoconch whorls. Axial ribs straight and orthocline; about 16 in first whorl of teleoconch, decreasing to 10­12 in remaining whorls and increasing to 14 on body whorl of holotype; interspaces about twice as wide as ribs, ending abruptly at periphery of last whorl. Spiral sculpture absent. Base rounded, smooth. Aperture rhomboid. Columella slightly concave, without fold. Outer lip thin. No umbilical fissure.

Dimensions: Holotype height 4.0 mm; width 0.9 mm.

Type material: Holotype IBUFRJ 12701. Paratype MORG 41056, paratype MNRJ 9824, paratype UFPE 4441, paratype IBUFRJ 12702, paratype ZMA Moll. 4.02.0 17, paratype ANSP 410303, paratype MNHN. All paratypes from Ilha de Itaparica, Praia do Despacho, Bahia State (13º01’S, 38º27’W), F. Maestrati coll., 1984­1989. All lots with two specimens, except MNHN with 21.

Type locality: 06º57’32”S 34º29’22”W, #7 REVIZEE, 750 m depth, Rv. “Natureza” coll., off Paraíba State, northeast coast of Brazil, 29/xi/2001.

Distribution: Ranging from Pernambuco State (08ºS) and Bahia State (13ºS), Northeast Brazilian coast.

Etymology: This species is named in honor of the Kamayura Indians, one of the indigenous peoples of Brazil. The name is employed as a noun in apposition.

Remarks: The most similar species to T. kamayura is T. coomansi van Aartsen, 1994 ( Clench & Turner, 1950, pl. 49, fig. 11 named as T. pusilla C. B. Adams, 1850 ) from Jamaica. Both have the same shell profile, type of protoconch, and axial ribs. Turbonilla kamayura reaches a larger size, i.e., a length of 4.8 mm versus 3.5 mm for T. coomansi . Although both species have the same type of helicoidal protoconch (type AII), the protoconch of T. kamayura has about one whorl more than does the protoconch of T. coomansi . The axial ribs in T. kamayura vary from orthocline to slightly opisthocline, while they are clearly opisthocline in T. coomansi . The main difference is in the interspaces between the axial ribs; in T. kamayura they are about twice as wide as the ribs while in T. coomansi they are equal to the width of the ribs.

Turbonilla enna Bartsch in Dall, 1927 (Pimenta & Absalão in press: fig. 35 [holotype]) is also similar to T. kamayura but can be distinguished by its planispiral protoconch (type AI); in T. kamayura the protoconch is helicoidal (type AII). Moreover, T. enna is nearly subcylindrical while the shell profile of T. kamayura is slightly triangular.

Figures

FIGURES 8 ­ 14. 8 ­ 10. Turbonilla kamayura n. sp., holotype (IBUFRJ 12701). 8: whole shell, length 4.0 mm; 9: base detail; 10: protoconch detail. Scale bar = 100 µm. 11 ­ 14. Turbonilla mermeroglaphyra n. sp., holotype (MNRJ 9825). 11: whole shell, length 2.4 mm; 13: base detail; 14: protoconch detail; 12: paratype (IBUFRJ 12704), whole shell, length 2.8 mm. Scale bar = 100 µm.