Description
Author: Jan Delsing
Text ID: 82373
Text Type: 1
Page: 0
Created: 2016-01-04 19:46:55 - User Delsing Jan
Language: EN
Text function: [[t:1174583,textblock=82373,elang=EN;Description]]
Acteon punctostriatus: Shell small, elliptic, white, glossy, not very thin ; whorls five, convex ; suture deeply impressed ; spire rapidly attenuated, sub-acutely tipped, four-ninths of the length of the shell, smooth; body-whorl more than three-fourths of the shell, somewhat shouldered above, smooth on the upper third, below with impressed, parallel, punctate lines, five or six of them distant on the middle, either equally or unequally distant, and six to eight closely approximate on the lower fourth ; one line only appears above the aperture, running near and at length into the suture of the body-whorl ; aperture in the same plane with the axis, the line of its length making with the axis an angle of not more than 10°, five-ninths of the length of the shell, sub-ovate, contracted above by the intrusion of the body-whorl, regularly but narrowly rounded below ; labrum sharp, prominent, with a short, abrupt curve above, then straight to the middle, arched in the lower half; columella with an obtuse fold ; labium moderately reflected below ; umbilicus small, partly covered by the reflected labium. Length, 0.16 inch; breadth, 0.095 inch: of a large specimen, length, 0.18 inch ; breadth, 0.1 inch.
Source: Adams, C.B., 1840. Descriptions of thirteen new species of shells of New England. (Original description)
Interchangeable taxa
Author: Jan Delsing
Text ID: 82371
Text Type: 19
Page: 0
Created: 2016-01-04 19:34:28 - User Delsing Jan
Language: EN
Text function: [[t:1174583,textblock=82371,elang=EN;Interchangeable taxa]]
Acteon punctostriatus: Variation
The specimens of this Acteon vary from pure white to trifasciate with rose or livid brown, usually faint and nebulous. The height of the spire, elevation of the nucleus, and extent of shell covered by the punctate lines, vary in the different specimens. Usually the spire is rather elevated, the nucleus somewhat depressed, and the punctate grooves cover about half of the last whorl. There may be one or several subsutural lines, the middle of the whorl is generally smooth and free from lines, and the anterior part crowded. The northern ones are variegated like those from the Antilles, but the latter are more frequently bright colored. The very young, like those figured by Adams and Orbigny, are usually white or translucent. The colors, when banded, are nearly always rather nebulous, and the number of bands never exceeds three, the anterior one most often absent. The shell is always thin, and often nearly translucent.
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)
Distribution
Author: Jan Delsing
Text ID: 82372
Text Type: 3
Page: 0
Created: 2016-01-04 19:37:06 - User Delsing Jan
Last change: 2016-01-04 19:47:38 - User Delsing Jan
Language: EN
Text function: [[t:1174583,textblock=82372,elang=EN;Distribution]]
Acteon punctostriatus: Eastcoast of the United States, southward to Caribic Florida and Bahama's.