Hyotissa semiplana

Hyotissa semiplana is an extinct species of large saltwater oysters, a fossil marine bivalve mollusk in the family Gryphaeidae, the foam oysters[1]

Hyotissa semiplana
Temporal range: Late Cretaceous
Fossil shells of Hyotissa semiplana from Maastrichtian age, on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Ostreida
Family: Gryphaeidae
Genus: Hyotissa
Species:
H. semiplana
Binomial name
Hyotissa semiplana
(de Sowerby, 1825)
Synonyms
  • Pycnodonte semiplana

Description

Fossil shells of Hyotissa semiplana can reach a diameter of about 60 millimetres (2.4 in).[2] They have thick-walled valves, with rough, nodose surface.[3][4]

Distribution

Fossils of this species have been found in the Campanian-Maestrichtian of Poland, in the Santonian-Maestrichtian of Europe and North Africa and in the Campanian of South India.[3][5]

References
  1. Universal Biological Indexer
  2. Kreidemuseum
  3. HALINA PUGACZEWSKA THE UPPER CRETACEOUS OSTREIDAE FROM THE MIDDLE VISTULA REGION (POLAND
  4. Anne Mehlin Sørensena, Finn Surlyka, John W.M. Jag Adaptive morphologies and guild structure in a high-diversity bivalve faunafrom an early Campanian rocky shore, Ivö Klack (Sweden)
  5. ANAND K. JAITLY and SANJAY K. MISHRA DISCOVERY OF THE OYSTER HYOTISSA SEMIPLANA (SOWERBY, 1813) FROM THE CAMPANIAN (LATE CRETACEOUS) OF SOUTH INDIA
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