Description
Author: Jan Delsing
Text ID: 82618
Text Type: 1
Page: 0
Created: 2016-01-24 20:59:57 - User Delsing Jan
Language: EN
Text function: [[t:596432,textblock=82618,elang=EN;Description]]
Shell small, translucent white or yellowish, of porcellanous texture, with a Simusigera nucleus, followed by five and a half normal whorls; general shape elegantly fusiform, but with a rather blunt-ended canal; spiral sculpture of fine even rounded elevated threads, nearly uniform all over the shell, about half as wide as the interspaces in most of which run an extremely fine intercalary thread; the primary threads average about eight in the breadth of a millimeter; transverse sculpture, first, of very fine distinct uniform lines of growth about twice as numerous in the same space as the primary spiral threads, which last are beautifully reticulated and to some extent rendered nodulous, or rather minutely wavy, by the intersections ; secondly, on the earlier whorls, of rather stout distant rounded riblets or waves seven or eight to a whorl, most distinct on the first whorl and entirely evanescent on the last two whorls; these are slightly oblique, and extend from the anterior margin of the anal fasciole to the suture in front; whorls a little irregular in form; suture strongly appressed; sculpture, as usual, less strong, but still perfectly distinct, on the fasciole; the notch rather deep, semicircular behind. Aperture longer than half the shell, moderately narrow, with the canal well defined and somewhat curved to the right; outer lip thickened within, slightly dentate at the margin from the spiral sculpture; a slight callus on the body and pillar, well inside the aperture ; pillar nearly straight. Lon. of shell, 11.5 mm; of last whorl, 9.0 mm; of aperture, 7.0 mm; lat. of shell, 5.2 mm; of aperture, 2.0 mm.
Source: Dall, 1889. Reports on the results of dredgings, under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877-78) and in the Caribbean Sea (1879-80), by the U. S. Coast Survey Steamer 'Blake'. (Original description)
Interchangeable taxa
Author: Jan Delsing
Text ID: 82620
Text Type: 19
Page: 0
Created: 2016-01-24 21:02:28 - User Delsing Jan
Language: EN
Text function: [[t:596432,textblock=82620,elang=EN;Interchangeable taxa]]
This is an extremely pretty little shell, not properly of the deep-sea fauna, perhaps, but apparently undescribed and (except for its stronger sculpture) bearing a curious resemblance in miniature to Pleurotomella emertonii
Source: Dall, 1889. Reports on the results of dredgings, under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877-78) and in the Caribbean Sea (1879-80), by the U. S. Coast Survey Steamer 'Blake'.