Taxon profile


Psilaxis Woodring, 1928

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


Shell with a single peripheral keel.
Shell medium-sized to large (usually 10-25 mm), from roundly to depressed cone-shaped; umbilicus always open, moderately wide to wide (19-30% of shell diameter); whorls somewhat bulging; upper (apical) side usually completely smooth, rarely with weak spiral striae; early postlarval shell sometimes with ± weak nodular sculpture; sharp peripheral keel formed by LPR (here upper point of whorl attachment), flanked on either side one weak rib (UPR and IPR); base in Recent species smooth except for two nodose rib surrounding umbilicus (PUR and UC); umbilical wall without spiral ribs; coloration of spiral bands or ± distinctly demarcated axial flames in shades of brown, rib surrounding umbilicus (UC) always light Protoconch: medium-sized to very large (ca. 1.1-1.8), distinctly heterostrophic, in Recent species with distinct, long anal keel. Radula: five-toothed-taenioglossate; rachidian with strong central cusp flanked on either side by a filiform cusp. Operculum: horny, circular with broad last whorl, flat with mushroom-shaped, peg-like projection on body side; peg with grooves arranged in counter-clockwise fashion.
Bieler, R. (1993). Architectonicidae of the Indo-Pacific (Mollusca, Gastropoda).
Author: Jan Delsing

Included taxa

Number of records: 4

species Psilaxis clertoni D. de Oliveira Tenório, J.C.N. Barros & al., 2011
species Psilaxis krebsii (O.A.L. Mörch, 1875)
species Psilaxis oxytropis (A. Adams, 1855)

Psilaxis oxytropis

species Psilaxis radiatus (Röding, 1798)

Psilaxis radiatus

Links and literature

EN The Interim Register of Marine and Nonmarine Genera [1329537]

Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [] [as Psilaxis Woodring, 1928]
Data retrieved on: 30 November 2019
EN Australian Faunal Directory [92911c7f-e108-4508-b3e8-2f37d1c5239a]

ABRS (2009-2019): Australian Faunal Directory [], Australian Biological Resources Study, Canberra [as Psilaxis Woodring, 1928]
Data retrieved on: 13 February 2015

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