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Cirsonella laxa Powell, 1937

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Cirsonella laxa

Autor: Powell

Taxon v check-listech zemí*

* Výčet zemí nemusí být kompletní

EN  

Popis

Shell minute, white, moderately solid, discoidal, widely umbilicate and loosely coiled. Whorls 2,75, plus a smooth low convex protoconch of 1,25 whorls. Spire not raised above the body whorl. Coiling rapid, latter half of body whorl bent slightly downwards. Sculpture of indistinct spiral cords, crossed by microscopic axial lines of growth. There are five spiral cords on the penultimate whorl, and five on the base that are considerably stronger than the rest. These five stronger basal cords extend from in front of the suture to the edge of the umbilicus. The wall of the umbilicus is smooth and the remainder of the body whorl, apart from the five cords, is crowded with closely spaced fine spiral threads. Umbilicus wide, perspective, about one-third the diameter of the base. Aperture circular. Peristome continuous, slightly thickened, actually detached from the parietal wall, and strongly recurrent at the suture. Height o,8 mm.; diameter 1,25 mm. (Holotype).
Powell, A.W.B. 1937 New species of marine Mollusca from New Zealand.

Možné záměny

This species is characterized by its loose coiling, discoidal shape, aperture recurrent at suture, and lack of umbilical crenulations.
Powell, A.W.B. 1937 New species of marine Mollusca from New Zealand.

Rozšíření

Habitat: Off Three Kings Islands, St. 933, 260 m.
Powell, A.W.B. 1937 New species of marine Mollusca from New Zealand.

Odkazy a literatura

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [jako Cirsonella laxa Powell, 1937]
Datum citace: 22. listopad 2013

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