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Taxon profile

genus

Discotectonica Marwick, 1931

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

Scientific synonyms

Acutitectonica Habe, 1961
Russetia Garrard, 1961

Description

Teleoconch: shell small to very large (usually 6-45 mm), depressed cone-shaped; umbilicus always open, wide to extremely wide (26-47% of shell diameter); whorls somewhat bulging, on either side of the peripheral keel distinctly concave; both sides usually with numerous spiral ribs or threads; juvenile whorls usually with distinct subsutural rib, 5-7 spiral ribs and distinct upper peripheral rib above the peripheral keel; later whorls with 6-10 spiral ribs between subsutural rib and upper peripheral rib (SSR and UPR then hardly stronger than other spiral ribs); 0-4 narrow spiral threads between UPR and keel-forming lower peripheral rib; spiral ribs nodose or almost smooth; upper point of whorl attachment at or below center of keel-forming rib; base: concave area near peripheral keel with 4-6 fine spiral ribs; convex basal area with about 10 spiral ribs, increasing in width towards umbilicus; 2-4 broad spiral ribs surrounding umbilicus, innermost of which (UC) broadest and flattened; umbilical wall with growth lines, without spiral ribs; coloration a diffuse yellowish-tan, with indistinct axial flames, occasionally also with regular white-brown fleck pattern on peripheral keel; base in most cases lighter, innermost basal rib (UC) always light. Protoconch: small to medium-sized (ca. 0.6-1.0), weakly heterostrophic, without anal keel. Radula: cuticularized, large rod-like structure with five rows of cusped tooth-like appendages instead of true radula. Operculum: horny, roundly and later (due to asymmetrically broad last whorl) ovate ear-shaped, flat with (often callously rein¬forced) 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 Discotectonica acutissima (G.B. Sowerby III, 1914)

Discotectonica acutissima

species Discotectonica alfi Thach, 2017
species Discotectonica discus (Philippi, 1844)

Discotectonica discus

species Discotectonica dumonti (P. Nyst, 1845 )
species Discotectonica nipponicus T. Kuroda & T. Habe, 1971

Discotectonica nipponicus

species Discotectonica petasus (Tomlin, 1928)

Discotectonica petasus

species Discotectonica placentalis R. B. Hinds, 1844

Discotectonica placentalis

species Discotectonica pseudoperspectiva Brocchi, 1814

Links and literature

EN The Interim Register of Marine and Nonmarine Genera [1011151]

Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [http://www.irmng.org] [as Discotectonica Marwick, 1931]
Data retrieved on: 30 November 2019
EN Australian Faunal Directory [17a4d56a-8fe0-4e62-b472-e3e66db88a4a]

ABRS (2009-2019): Australian Faunal Directory [https://biodiversity.org.au/afd/home], Australian Biological Resources Study, Canberra [as Discotectonica Marwick, 1931]
Data retrieved on: 13 February 2015

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