Popis
Autor: Jan Delsing
Text ID: 91889
Text Type: 1
Page: 0
Založeno: 20.02.2019 16:46:53 - Uživatel Delsing Jan
Language: EN
Odkazová funkce: [[t:540213,textblock=91889,elang=EN;Popis]]
Shell small, white, the upper surface of the whorls with very small distinct rose-red dots sparsely distributed on the raised nodules of the sculpture, or all white; five or more inflated strongly sculptured whorls, and a smooth nucleus, Spiral sculpture of, on the upper surface of the last whorl, two small and two strong spiral alternated ribs, one of the smaller just below the suture; a large spiral on the periphery and four on the base; crossed by numerous obliquely radiating threads, which make the early whorls coarsely reticulate with nodules at the intersections, while in the later whorls the radiations become less marked and the spirals more numerous and more conspicuously nodulous. Whorls rounded, apex a little blunt, suture distinct, not channelled, base rounded, umbilicus none; pillar nearly straight, with a strong tooth near its base, aperture rounded, oblique, a little descending above, with six or eight stout lirae ending in tooth-like nodules, body with a moderate layer of nacreous callus. This little shell is proportionally more depressed, and has fewer spirals when young, and owing to the persistent lirae looks adult at almost any stage. It is extremely lovely when color and sculpture are perfect and fresh, but often is wholly whitish. Alt. 5.0, max. diam. 4.5 mm.
Dall, W.H., 1889 - A preliminary catalogue of the shell-bearing marine mollusks and brachiopods of the southeastern coast of the United States
Autor: Jan Delsing
Text ID: 96265
Text Type: 1
Page: 0
Založeno: 31.10.2019 15:53:47 - Uživatel Delsing Jan
Language: EN
Odkazová funkce: [[t:540213,textblock=96265,elang=EN;title]]
Shell small (attaining a height of about 6 mm), solid, nonumbilicate, as broad as high. Protoconch depressed, about one convex whorl, clearly demarcated from teleoconch, with fine, irregularly anastomosing sculpture throughout, diameter 0.31 mm. Teleoconch with 3-3,5 regularly expanding whorls. First postnuclear whorl with 25-35 strong axial riblets, between which are many fine, irregular cords. Axials become stronger on the later whorls and are crossed by strong spiral cords forming strong nodules. Penultimate whorl with 4 spirals, third most prominent, fourth just above the suture and without nodules. Body whorls with 7 spiral cords, third forming periphery. Aperture ovate, with 4 strong lirations ending in 4 denticles. Columella short, straight with a small thickening at the base. Colour white with irregular red patches on (mainly) spiral cords of the body whorl; aperture nacreous white within.
Moolenbeek & Faber 1989. The genus Euchelus in the West Indies
Autor: Jan Delsing
Text ID: 106463
Text Type: 1
Page: 0
Založeno: 21.02.2021 12:03:00 - Uživatel Delsing Jan
Language: EN
Odkazová funkce: [[t:540213,textblock=106463,elang=EN;title]]
Shell small (attaining a height of about 6 mm), solid, imperforate, with about 5 rounded, highly sculptured whorls. Protoconch depressed, small, glassy, of about 1,5 whorls. Spiral sculpture consists of 3 strong cords on the spire with a 4th appearing on the body whorl and forming the whorl periphery; smaller, intercalary spirals are usually present; base with 4 to 7 slightly nodulous cords. Axial sculpture on the first post-nuclear whorl of fine, sharp retractive riblets. becoming stronger on the later whorls; these form strong nodules on the spirals, and with the spirals form a strong reticulate pattern on the whorls. Aperture ovate, thickened within, with 7 to 8 strong lirations ending in strong denticles; columella short, straight, thickened, with a strong tooth near its base. Color white, often with discrete spots of red on the major spirals.
Geographic distribution: The Bahamas, southeast Florida, and south through the Antilles to Barbados. Bathymetric range: This species, like all the others of the genus, is primarily a shallow water species, occurring below the 100 m level only as dead shells. Deeper records are usually in the vicinity of a sharp drop-off, and shells are washed down the slope to as deep as 823 m.
The shells from deep water are all dead and few exhibit the rose-colored patches often seen in the shallow water forms. Whether this is due to wear of the shell is hard to say, but many of the fresher specimens from deeper water are pure white, indicating that perhaps there is a population in deeper water which never develops the coloration of some shallow water forms.
Quinn J F 1979 - The systematics and zoogeography of the gastropod family Trochidae collected in the Straits of Florida and its approaches