Description
Author: Jan Delsing
Text ID: 83111
Text Type: 1
Page: 0
Created: 2016-04-23 17:32:48 - User Delsing Jan
Language: EN
Text function: [[t:1189324,textblock=83111,elang=EN;Description]]
The shell is rather large, claviform, with very high spire exceeding half of the shell height, thick and solid, light-brown, consisting of almost 12 whorls. The protoconch is missing. The whorls are weakly convex and slightly angled; the point of angulation is situated below the periphery in the spire whorls, but shifts upwards on the last whorls. The subsutural slope is concave, and the prominence of concavity increases towards the body whorl. Sutures are clear, straight, and shallow. Axial sculpture consists of oblique, narrowly crested folds terminating on the subsutural slope. Some folds form weak nodules just below the suture. The folds become subobsolete on the last quarter of body whorl, probably as a result of preceding shell damage. There are 14 folds on the penultimate whorl and about the same number on the body whorl. Spiral ribs are numerous, uniform, rounded, moderately strong, with interspaces equal to them in width. The ribs cover the entire shell surface but become narrower, closer, and weaker on the subsutural slope. The shell base forms a weak bend in passing to a moderately developed fasciole. The aperture is rather small, inversely pyriform, with a distinct stromboid notch. The outer lip with a thin edge, projects strongly and forms an alate expansion between the anal sinus and stromboid notch. There is no prominent prelabral varix, only a thin fold curved in correspondence to growth lines is present. The inner lip is covered by thick and wide glossy callus which is mostly free along its outer edge and forms a shallow false umbilical cavity. The parietal callus pad is large and rounded, constricting the entrance to the anal sinus. The anal sinus is deep, U-shaped, with spout-like edge, directed slightly adapically. The canal is short, slightly bent to the right, shallowly notched and obliquely truncated. H = 37.9, Hb = 17.5, Ha = 14.2, D = 11.4 mm.
Source: Sysoev, 1996. Deep-sea conoidean gastropods collected by the John Murray Expedition, 1933–34.
Interchangeable taxa
Author: Jan Delsing
Text ID: 83113
Text Type: 19
Page: 0
Created: 2016-04-23 17:34:13 - User Delsing Jan
Language: EN
Text function: [[t:1189324,textblock=83113,elang=EN;Interchangeable taxa]]
The new species resembles Drillia tasconium Melvill & Standen, 1901 from the Persian Gulf but differs in the high spire, larger and more solid shell, and absence of spiral sulci which deeply furrow the subsutural area in D. tasconium.