Gryphaeidae

The Gryphaeidae, common name the foam oysters or honeycomb oysters, are a family of marine bivalve mollusks. This family of bivalves is very well represented in the fossil record, however the number of living species is very few.

Gryphaeidae
Temporal range: [1]
Specimens of Gryphaea articulata from the Jurassic of France
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Ostreida
Superfamily: Ostreoidea
Family: Gryphaeidae
Vyalov, 1936
Genera

See text

Praeexogyra hebridica from the Frome Clay (Bathonian, Middle Jurassic) of Langton Herring, Dorset, England.
Liostrea strigilecula from the Carmel Formation (Middle Jurassic) of southwestern Utah.

All species have shells cemented to a substrate. Shells are considered brittle, inequivalve, with the left, lower (cemented) valve convex and the right (upper, non-cemented) valve flat or slightly concave.[2]

Subfamilies

Genera and species within this family are divided into three subfamilies, Exogyrinae, Gryphaeinae and Pycnodonteinae. Both Exogyrinae and Gryphaeinae are completely extinct. Only two genera Hyotissa and Neopycnodonte in the subfamily Pycnodonteinae have extant species.[3][4][5]

Genera and species

Genera and species within the family Gryphaeidae include: Family Gryphaeidae Vialov, 1936 (some genera also known as Devil's toenails)

  • Subfamily †Exogyrinae Vialov, 1936
    • Genus †Aetostreon Bayle, 1878
    • Genus †Amphidonte Fischer von Waldheim, 1829
    • Genus †Costagyra Vialov, 1936
    • Genus †Exogyra Say, 1820
    • Genus †Fluctogyra Vialov, 1936
    • Genus †Gryphaeostrea Conrad, 1865
    • Genus †Gyrostrea Mirkamalov, 1963
    • Genus †Ilymatogyra Stenzel, 1971
    • Genus †Nanogyra Beurlen, 1958
    • Genus †Nutogyra Vialov, 1936
    • Genus †Planospirites Lamarck, 1801
    • Genus †Vultogryphaea Vialov, 1936
  • Subfamily †Gryphaeinae Vialov, 1936
    • Genus †Africogryphaea Freneix, 1963
    • Genus †Deltoideum Rollier, 1917
    • Genus †Gryphaea Lamarck, 1801
    • Genus †Liostrea DouvillŽ, 1904
    • Genus †Pernostrea Munier-Chalmas, 1864
    • Genus †Praeexogyra Charles, 1952
  • Subfamily Pycnodonteinae Stenzel, 1959
  • Subfamily Incertae sedis
    • Genus †Rhynchostreon Bayle, 1878

References
Wikispecies has information related to Gryphaeidae.
  1. Michael Hautmann; David Ware; Hugo Bucher (2017). "Geologically oldest oysters were epizoans on Early Triassic ammonoids". Journal of Molluscan Studies. 83 (3): 253–260. doi:10.1093/mollus/eyx018.
  2. Jocelyne Martin; Gérard Paulmier (3 February 2011). Les invertébrés marins du golfe de Gascogne à la Manche orientale. Editions Quae. p. 82. ISBN 978-2-7592-0107-5.
  3. "Fossilworks: Gryphaeidae". The Paleobiology Database. Retrieved February 6, 2011.
  4. "Hyotissa Stenzel, 1971". WoRMS - World Register of Marine Species. 2021. Retrieved November 4, 2021.
  5. Okamura, Kiyoshi; Yamagishi, Yutaka (1992). "Molluscan fauna from the Late Miocene Hatsuse Formation in the Miura Peninsula, Kanagawa Prefecture, Japan" (PDF). Transactions and Proceedings of the Palaeontological Society of Japan (165): 1009–1023. ISSN 0031-0204. Retrieved November 4, 2021.


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