Drillia inchoata, Sturany, 1900

Albano, Paolo G., Bakker, Piet A. J., Janssen, Ronald & Eschner, Anita, 2017, An illustrated catalogue of Rudolf Sturany's type specimens in the Naturhistorisches Museum Wien, Austria (NHMW): Red Sea gastropods, Zoosystematics and Evolution 93 (1), pp. 45-94 : 70

Pleurotoma (? Drillia) inchoata Sturany, 1900 Figure 22

Pleurotoma (? Drillia) inchoata Sturany, 1900b: 210; redescribed and illustrated in Sturany (1903), page 229-230, plate III, figures 8a-b.

Type locality.

Station 145, “östlich von J. Dahalak" [east of Dahlak Island, Eritrea], 16°2.6'N, 41°13.5'E, 800 m.

Type material.

Holotype: NHMW 84251, height 21.2 mm.

Original description.

Schale abgestutzt spindelförmig, hellgelb, aus 9 1/2 Umgängen bestehend, deren jeder mit Ausnahme des Embryonalgewindes in seiner oberen Hälfte concav, in seiner unteren convex gebaut ist, und welche mit zahlreichen Spiralreifen und circa 15-16 wellenförmig verlaufenden Querrippen ausgestattet sind; überdies stehen zwischen den Querrippen noch mikroskopisch feine Anwachsstreifen. Unmittelbar vor der (leider mangelhaft erhaltenen) Mündung eine knotig angeschwollene und nach rechts vorgezogene Querrippe.

Höhe der Schale 21,3, Breite 9,0 mm; Höhe der Mündung 9,1 mm.

Ein einziges Exemplar von Station 145 (800 m).

Verwandt mit Pleurotoma (Drillia) pallida Sow.; in der Form an Columbella angularis Sow. gemahnend.

Translation.

Shell truncated and fusiform, pale yellow, made by 9.5 whorls, concave in their upper half and convex in the lower half, with the exception of the protoconch; with numerous spiral threads and approximately 15 - 16 undulated axial ribs among which microscopically fine growth lines stand. Immediately prior to the (unfortunately poorly preserved) aperture, there is a thick nodulose axial rib bent to the right.

Height of the shell 21.3 mm, width 9.0 mm; height of the mouth 9.1 mm.

A single specimen from station 145 (800 m).

Related to Pleurotoma (Drillia) pallida Sowerby; shape reminding Columbella angularis Sowerby.

Comments.

This species can be assigned to the genus Drillia Gray, 1838

Figures

Figure 22. Pleurotoma inchoata Sturany, 1900, Station 145 (Dahlak Archipelago, Eritrea, Red Sea). A. Original figure by Sturany (1903). B-D, F. Holotype, NHMW 84251: front (B), right side (C), back (D), protoconch (F). E. Original holotype label. Scale bars: B-D: 5 mm, F: 0.5 mm.