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species

Gymnobela multilirata Ortega & Gofas, 2019

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Raphitomidae »  genus Gymnobela

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Gymnobela multilirata

Author: Ortega & Gofas

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Description

Shell small, whitish, consisting of a little more than three convex, definitely shouldered whorls, with a well marked suture; protoconch (visible part 550 µm high, 400 µm diameter) protruding and somewhat pointed apically, formed of a little more than one whorl, nearly smooth on the initial part but mostly covered by minute, irregular granules which are loosely aligned spirally. Protoconch/teleoconch limit very definite along an orthocline line. Teleoconch with elevated spiral cords, of which 4-5 on the spire whorls and 19-21 on the last whorl; cords narrower than the interspaces, one along the suture, the strongest one on the shoulder and the 2-3 abapical ones decreasing slightly in size; on the last half-whorl, an additional cord between the suture and the shoulder. The entire teleoconch covered by axial wrinkles which are much finer than the cords and override them. Aperture oval-elongate, somewhat truncated adapically at the shoulder of last whorl; outer lip simple, siphonal canal short and very broad. Dimensions of the holotype: 2.2 mm height x 1.15 mm diameter, paratypes up to 2.7 x 1.5 mm. ETYMOLOGY. — An adjective formed from the Latin lira, a furrow, based on the sculpture with numerous spiral furrows.
Ortega, J. & Gofas, S., 2019. The unknown bathyal of the Canaries: new species and new records of deep-sea Mollusca.

Interchangeable taxa

"Gymnobela" multilirata n. sp., does not resemble closely any Atlantic species known to us, and even the generic and familial placement is tentative. It is guided by the overall resemblance with species like e.g. Gymnobela subaraneosa (Dautzenberg & H. Fischer, 1896) or G. lamyi (Dautzenberg, 1925) (see Bouchet & Waren 1980: 52) which also have a definite shoulder and a sculpture of widely separated spiral cords. Another superficially similar species is Nepotilla amoena (G. O. Sars, 1878) (see Bouchet & Waren 1980: 75, 76) but the latter has fewer and much stronger spirals and a much narrower canal and abapical part. The paucispiral protoconch of G. multilirata n. sp. is typical of a species with non-planktotrophic larval development but does not give a definite clue, although the profile of the protoconch and its definite, orthocline edge resembles the cancellariid Pseudobabylonella minima (Reeve, 1856) (see Verhecken 2007:351). However, teleoconch characters including the lack of folds on the columella and the elongate, tapering last whorl (usually blunt and short in cancellariids) do not support a placement in the latter family. Despite the uncertainty on its position, we consider this species as distinctive and abundant so as to be named.
Ortega, J. & Gofas, S., 2019. The unknown bathyal of the Canaries: new species and new records of deep-sea Mollusca.

Distribution

TYPE LOCALITY. — Off W Gran Canaria, 28°08.95'N, 15°53.1 l'W/28°09.06'N, 15°52.92'W, 655-660 m.
OTHER MATERIAL EXAMINED. — 66 sh., SEAMOUNT 2 DW130.
Ortega, J. & Gofas, S., 2019. The unknown bathyal of the Canaries: new species and new records of deep-sea Mollusca.
Author: Jan Delsing

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