Kongsrudia rolani, Lygre, Frøydis & Schander, Christoffer, 2010

Lygre, Frøydis & Schander, Christoffer, 2010, Six new species of pyramidellids (Mollusca, Gastropoda, Pyramidelloidea) from West Africa, introducing the new genus Kongsrudia, Zootaxa 2657, pp. 1-17 : 4-7

Kongsrudia rolani new species

( Fig. 3 A–F )

Type locality: Gabon, station G16, 03 º 49’S, 10º 37’E, 69 m.

Type material: Holotype deposited in Bergen Museum ZMBN 86655; 6 Paratypes from Type locality in Bergen Museum ZMBN 86656 2 Paratypes Gothenburg Natural History Museum GNM Gen. kat. 2010- 22.252 and Gen. kat. 2010-22.253.

Material examined: Station N15 20 shells; G2, 11 shells; G16, 10 shells; CR2, 13 shells.

Etymology: The species is named after Emilio Rolán, Vigo, Spain who has worked extensively on West African Pyramidellids, and is a dear friend.

Description: Shell tall, slender, conical, milky white and shiny with a blunt, pointed apex. Protoconch of type B. Whorls convex, turreted. Suture distinct and moderately deep, noticeably oblique. Narrow subsutural shelf. Axial ribs elevated, continuing down to base. Spiral sculpture consisting of numerous ribs, about equidistant, equally broad as interspaces. Covering axial ribs giving a grid-like appearance. Spiral ribs equally broad or broader than interspaces continuing to the base. Microsculpture of spine-like projections from upper and lower side of spiral ribs ad vertical striae on spiral ridges within interspaces of axial ribs. Aperture oval, almost kidney-shaped because of a distinct columellar tooth. Umbilical fissure can be deep or shallow.

Distribution: Nigeria, Gabon and Congo, 24- 162 m.

FIGURE 2 A–F. Kongsrudia gruveli . A: Teleoconch, station G2, Gabon, 00º19’N 09º15’E; B & D: Protoconch, station CR1, Republic of Congo, 04º07’S 11º02’E; C: Protoconch, station G2; E: Suture and details of the sculpture; F: Aperture and riblets on the inside of the outer lip.

Remarks: The shape and sculpture is similar to Kongsrudia gruveli ( Dautzenberg, 1910) , but the whorls are more convex and K. gruveli lacks the microsculpture. The axial sculpture of K. gruveli is more prominent, especially on the base. Kongsrudia approxiamans ( Dauzenberg, 1912) and K. ersei ( Schander, 1994) are similar, but they both have more convex whorls, lack the subsutural shelf and have broader spiral ribs that are more tightly spaced. Like the genus Afroturbonilla Peñas, Rolán & Schander, 1999 , Kongsrudia is so far only known from off West Africa.

Figures

FIGURE 3 A – F. Kongsrudia rolani n. sp. A: Paratype, teleoconch, station G 16, Gabon, 03 º 49 ’ S, 10 º 37 ’ E; B: Holotype, teleoconch, station G 16, Gabon, 03 º 49 ’ S, 10 º 37 ’ E; C-D: Paratype, protoconch, station G 16, Gabon, 03 º 49 ’ S, 10 º 37 ’ E; E-F: Paratype, details of the sculpture and microstructure, station N 15, Nigeria, 04 º 01 ’ N, 07 º 58 ’ E.