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Taxon profile

genus

Spirolaxis Monterosato, 1913

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Allogastropoda »  family Architectonicidae - Sundials

Scientific synonyms

Aguayodiscus Jaume & Borro, 1946
Paurodiscus Rehder, 1935

Description

Teleoconch: very small to small (usually 1.5-2.5 mm); whorls detached ( open coiling ) throughout or after about 1.5 whorls; small specimens coin-shaped and largely planispiral, larger forms helicoidal; two peripheral keels formed by two usually equally strong ribs (LPR and rib of the basal area), resulting in quadratic (rarely hexagonal) cross-section of whorl; axial sculpture lacking or distinctly developed, with upper and lower surfaces similar; subsutural rib and rib surrounding extremely wide umbilicus often weak, without distinct crenae; peripheral region between keels with few thin spiral threads; coloration indistinctly off-white to tan, occasionally with weak irregular flames or blotches. Protoconch: very small to small (ca. 0.48-0.72), almost planispiral to distinctly heterostrophic, without anal keel. Radula: five-toothed-taenioglossate; rachidian stronger than marginal teeth (rotulacatharinea, centrifuga). Operculum: horny, round, cone-shaped, with peg-like projection on body side.
Source: Bieler, 1993. Architectonicidae of the Indo-Pacific (Mollusca, Gastropoda).
Author: Jan Delsing

Included taxa

Number of records: 7

species Spirolaxis argonauta Bieler, 1993

Spirolaxis argonauta

species Spirolaxis centrifuga Monterosato, 1890

Spirolaxis centrifuga

species Spirolaxis clenchi Jaume & Borro, 1946

Spirolaxis clenchi

species Spirolaxis cornuammonis J. C. Melvill & R. Standen, 1903

Spirolaxis cornuammonis

species Spirolaxis cornuarietis Bieler, 1993

Spirolaxis cornuarietis

species Spirolaxis exornatus Bieler, 1993

Spirolaxis exornatus

species Spirolaxis rotulacatharinea (Melvill & Standen, 1903)

Spirolaxis rotulacatharinea


Links and literature

EN Australian Faunal Directory [d8f48096-e43f-4f29-81b9-08bde15952da]

ABRS (2009-2015): Australian Faunal Directory [http://www.environment.gov.au/biodiversi...], Australian Biological Resources Study, Canberra [as Spirolaxis Monterosato, 1913]
Data retrieved on: 13 February 2015

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