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Taxon profile

species

Crisilla ovulum Gofas, 2007

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Littorinimorpha »  family Rissoidae »  genus Crisilla

Distribution

Atlantic Seamounts

Description

Shell: Shell with moderately high spire, pupoid with blunt apex, adults up to 1.6x 1.0 mm. Protconch of 1.25 whorls, covered with minute, indistinct granules more or less arranged into blurry spiral bands. Teleoconch of 2.5-3.0 whorls, with a sculpture of faint axial wrinkles, and shallow spiral furrows. Axial wrinkles parallel to growth lines, gradually fading out on the abapical part of the body whorl. Spiral furrows either demarcating broad, flat spiral cords, or more scanty and separated by broad flat surfaces; with minute spiral threads running inside; a more well-marked furrow running subsuturaly. Intersection of spiral cords and axial wrinkles resulting in a beaded appearance, particularly on the adapical part of whorls. Body whorl rounded, slightly constricted, the abapical part with 18-20 more definite, flat spiral cords. Outer lip orthocline, slightly flexuous, bent forward at is adapical insection, with a thin edge, not thickened; internally smooth. Inner lip thin, bordering a narrow umbilicus. Shell colour entirely white, translucent. Operculum thin, paucispiral, with eccentric nucleus.

Body: Cephalic tentacles cylindrical,slender with rounded tips. Eyes embedded in a slight swelling at the base of each tentacle. Snout somewhat tapering, truncated and bilobed anteriorly, with tiny bright yellow jaws visible by transparency and anterior part tinged with pale brown. Elongate yellowish granular masses behind each eye; other more irregular yellowish to whitish mass visible by transparency beneath the operculum. Sole of foot colourless with pedal glands inconspicuous; metapodium with a faint longitudinal groove. One metapodial tentacle, forming a triangular flap. Right and left palial tentacles moderately small. Visceral mass visible by transparency in the spire whorls, reddish brown with conspicuous series of black granules.

Gofas, 2007, Original description
Author: Jan Delsing

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Crisilla ovulum Gofas, 2007]
Data retrieved on: 21 July 2015

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