Taxon profile


Pseudomalaxis Fischer, 1885

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


Teleoconch: shell small (usually 5-10 mm), coin-shaped and largely planispiral; two peripheral keels formed by partly fused spiral ribs of differing strength; upper (apical) surface larger and upper keel stronger, resulting in trapezoidal cross-section of whorl; lower (umbilical) side concave; suture deep because upper point of whorl attachment below upper keel; extremely wide umbilicus; sculpture of usually weakly developed spiral and axial ribs and threads, with upper and lower surfaces similar; rib surrounding umbilicus without distinct crenae; this rib close to peripheral keel of preceding whorl, therefore most of umbilical wall not exposed; peripheral region between keels with few thin spiral threads; coloration indistinctly off-white or yellowish, occasionally with weak irregular flames or blotches. Protoconch: small to medium-sized (ca. 0.78-1.12), almost planispiral to distinctly heterostrophic, without anal keel. Radula: five-toothed-taenioglossate; rachidian stronger than marginal teeth {zanclaeus). Operculum: horny, round, flat with peg-like projection on body side.
Bieler, R. (1993). Architectonicidae of the Indo-Pacific (Mollusca, Gastropoda).
Author: Jan Delsing

Included taxa

Number of records: 8

species Pseudomalaxis bollonsi Mestayer, 1930

Pseudomalaxis bollonsi

species Pseudomalaxis centrifugus T. A. di Monterosato, 1890
species Pseudomalaxis clenchi Jaume & Borro, 1946
species Pseudomalaxis foliacea R. A. Philippi, 1844
species Pseudomalaxis lamellifera Rehder, 1934
species Pseudomalaxis macandrewi T. Iredale, 1915
species Pseudomalaxis obolos K. H. Barnard, 1963

Pseudomalaxis obolos

species Pseudomalaxis zanclaeus (Philippi, 1844)

Pseudomalaxis zanclaeus

Links and literature

EN The Interim Register of Marine and Nonmarine Genera [1380480]

Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [] [as Pseudomalaxis P. Fischer, 1885]
Data retrieved on: 22 January 2020
EN Australian Faunal Directory [d76c6e08-6a7b-471b-b999-6b19083c2dc3]

ABRS (2009-2019): Australian Faunal Directory [], Australian Biological Resources Study, Canberra [as Pseudomalaxis Fischer, 1885]
Data retrieved on: 13 February 2015

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.