CZ EN
SEARCH  

Taxon profile

species

Cerithiopsis nina Bartsch, 1915

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  family Cerithiopsidae »  genus Cerithiopsis

Scientific synonyms

Cerithiopsis saba Bartsch, 1915

Images

Cerithiopsis nina

Author: Bartsch, P.

Taxon in country check-lists*

* List of countries might not be complete

Description

Shell very small, light chestnut brown. Nuclear whorls smooth, forming the slender, mucronate apex of the shell. Postnuclear whorls slightly shouldered at the summit, moderately rounded, marked by three spiral cords, of which the first is at the summit, the third about as far posterior to the suture as it is separated from its neighbor posteriorly. In addition to the spiral sculpture, the whorls are marked by strong axial ribs which equal the spiral sculpture in strength. The junctions of the axial ribs and the spiral cords form tubercules, while the spaces inclosed between them form well impressed, squarish pits. The tubercles of the cord at the summit are slightly truncated posteriorly, and slope gently anteriorly: those of the succeeding two cords are abruptly truncated posteriorly, sloping gently anteriorly, Of the axial ribs, 18 occur upon all the whorls except the penultimate, on which there are 20. Sutures moderately constricted. Periphery of the last whorl marked by a strong spiral cord, the space between it and the suprasutural cord being crossed by the continuation of the axial ribs which terminate at the posterior edge of the peripheral cord. Base slightly concave, with a spiral cord at the insertion of the columella. Aperture strongly channeled anteriorly, almost circular; outer lip thin; columella covered with a thick callus which is reflected over the parietal wall and connects this with the posterior angle of the aperture, rendering the peristome complete.
The typo and another specimen, Cat. No. 250358, U.S.N.M., come from Port Alfred (Coll. No. 1281). The type has almost five postnuclear whorls, and measures: Length, 1.9 mm.; diameter, 0.7 mm.
Bartsch, P., 1915. Report on the Turton Collection of South African marine mollusks, with additional notes on other South African shells contained in the United States National Museum.
Author: Jan Delsing

Contributions to BioLib

Help us to expand this encyclopedia! If you are logged in, you can add new subtaxa, vernacular and scientific names, texts, images or intertaxon relationships for this taxon.

Comments