Author: Jan Delsing
Text ID: 81554
Text Type: 7
Page: 0
Created: 2015-11-30 17:33:27 - User Delsing Jan
Last change: 2015-11-30 17:34:38 - User Delsing Jan
Language: EN
Text function: [[t:596960,textblock=81554,elang=EN;title]]
Shell high and narrow, rather strong, white, spiralled, with a high subscalar spire ending bluntly in a small tip, with a very small body-whorl, a short contracted base, and a very short small snout. Sculpture: Longitudinals: there are a number of hair-like sinuous lines, which in the sinus-area are like bars; they are parted by flat intervals of about three or four times their width: the lines of growth are very faint. Spirals: there are on each whorl two strong sharp keels which nearly trisect the whorl; the lower of these is sometimes feeble; marginating the suture below is a fine thread; on the base are 8 or 10 sharp and prominent threads of varying and unequal strength; at the upper end of the snout is another strong thread; below this is a little furrow, answering, as in Cerithiopsis, to a small nick at the point of the pillar. On the pillar are from two to four more threads of variable strength. Colour porcellanous white. Spire high, narrow, conical, subscalar. Apex a little bluntly conical, consisting of 4 to 5 whorls, of which the upper ones are small and smooth; the last two are ornamented with minute ribs or elongated bosses. Whorls about 10 in all, high and narrow, of very slow and regular increase, slightly convex, with a sloping shoulder, rather cylindrical in the middle, and slightly contracted below; the last whorl is small, very slightly tumid, with a very contracted base and a small subcylindrical snout, the point of which is slightly reverted and nicked. Suture very minute and concealed, in spite of the contractions of the whorls and the inferior margination. Mouth short, small, and pear-shaped, not narrow, triangularly pointed above, and ending below in the short, rather open canal. Outer lip a pretty regular curve; its edge is prominent below with a low shoulder above, leaving a wide funnel-shaped opening for the rather shallow rounded sinus. Inner lip very narrow, thin, and short, dying out early on the narrow twisted oblique edge of the pillar, which is slightly reverted along the side of the canal so as to produce a small twisted furrow. The line of junction of the pillar and the body is very concave. H. 0.32 inch B. 0.11 inch. Penultimate whorl, height 0.07 inch Mouth, height 0.12 inch, breadth 0,06 inch.
Source: Watson, 1886. Report on the Scaphopoda and Gasteropoda collected by HMS Challenger during the years 1873-1876. Reports of the scientific results of the voyage of H.M.S. "Challenger" (Original description)
Interchangeable taxa
Author: Jan Delsing
Text ID: 81556
Text Type: 19
Page: 0
Created: 2015-11-30 17:39:09 - User Delsing Jan
Language: EN
Text function: [[t:596960,textblock=81556,elang=EN;Interchangeable taxa]]
The species has a strong superficial likeness to D. emendata Monterosato but that is a broader and larger shell, has a more tumid body-whorl and a longer base; its whorls are not so high-shouldered, are more convex, are not so strongly keeled, are not so deeply and strongly parted by the square impressed suture; and the apex is of the large blunt dome type, consists of only two whorls, and is simply carinated.