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Taxon profile

species

Anticlimax bicornis F. Rubio & E. Rolán, 2014

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Littorinimorpha »  family Tornidae »  genus Anticlimax

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Anticlimax bicornis

Author: Rubio & Rolan

Anticlimax bicornis

Author: Rubio & Rolan

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Description

Shell small (< 2 mm), robust, bicarinate, formed by 3,75 whorls separated by a faint suture, with a rather low spire and widely umbilicate.
The protoconch is large in relation to the dimensions of the shell (about 25%), with a little more than 2 whorls and about 380 µm in diameter; it has 2 parts, the first (1,25 whorls) completely smooth, and the second (¾ of whorl) covered by axial growth lines, more evident along the suture and with randomly distributed tubercles; the termination is evident by the change in sculpture of the teleoconch. This has 1,5 whorls and 2 strong peripheral carinae which angle the shell. Adapical part convex, covered completely by spiral cords that develop in zigzag; periphery somewhat concave, covered by spiral cords also in zigzag, but without folds or axial ribs. Base convex delimited by the peripheral carina, completely smooth except close to the carina and showing a broad umbilicus which allows the previous whorls to be seen. Aperture rounded, prosocline; parietal area callous with a thick layer; columella arched, reflected outward but without forming callus; outer lip not modified by spiral cords, but the peripheral carina angles and expands it laterally. Very wide umbilicus, inside which there are marked growth lines and, on the deeper umbilical wall area 3-4 spiral cordlets.
Dimensions: the holotype is 1.66 mm in diameter.
Rubio, F. & Rolán, E., 2014. The family Tornidae in the tropical Southwest Pacific: the genus Anticlimax Pilsbry & McGinty, 1946 (Gastropoda, Truncatelloidea) with the description of 42 new species

Interchangeable taxa

The species is characterized by the size and decoration of the protoconch, formed by randomly distributed micro-tubercles; the characteristic spiral cords in zigzag; the concave periphery with ribs without axial folds; the base lacking spiral cords and a wide umbilicus with fine cordlets inside.
Most of the species of its group have peripheral prominences: the most similar is Anticlimax singularis spec. nov., but this species has only one prominence on the external lip and the protoconch has a distinctive microsculpture.
Rubio, F. & Rolán, E., 2014. The family Tornidae in the tropical Southwest Pacific: the genus Anticlimax Pilsbry & McGinty, 1946 (Gastropoda, Truncatelloidea) with the description of 42 new species

Distribution

Only known from Solomon Islands, between 396-411 m. Bathyal species, dredged at 396-411 m depth on the slope.
Rubio, F. & Rolán, E., 2014. The family Tornidae in the tropical Southwest Pacific: the genus Anticlimax Pilsbry & McGinty, 1946 (Gastropoda, Truncatelloidea) with the description of 42 new species
Author: Jan Delsing

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