Ostreoidea

Ostreoidea
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Subclass:	Pteriomorphia
Order:	Ostreoida
Superfamily:	Ostreoidea Rafinesque 1815
Gryphaeidae Ostreidae

Ostreoidea is a taxonomic superfamily of bivalve marine mollusc, sometimes simply identified as oysters,^[1] containing two families. The ostreoids are characterized in part by the presence of a well developed axial rod.^[2] Anal flaps are known to exist within the family Ostreidae but not within the more-primitive Gryphaeidae.^[3] The scar from the adductor muscle is simple, with a single, central scar.^[4] In the majority, the right valve is less convex than the left.^[5]

References

1. G. M. Barker (2004). Natural Enemies of Terrestrial Molluscs. CABI. p. 326. ISBN 978-0-85199-061-3.
2. Elizabeth Harper; John David Taylor; J. Alistair Crame (2000). The Evolutionary Biology of the Bivalvia. Geological Society of London. p. 175. ISBN 978-1-86239-076-8.
3. Norman Dennis Newell (1998). Bivalves: an eon of evolution : paleobiological studies honoring Norman D. Newell. University of Calgary. p. 28. ISBN 978-1-55238-005-5.
4. Eugene V. Coan; Paul Valentich Scott; F. R. Bernard (2000). Bivalve seashells of western North America: marine bivalve mollusks from Arctic Alaska to Baja California. Santa Barbara Museum of Natural History. p. 52. ISBN 978-0-936494-30-2.
5. Ashraf M.T. Elewa (9 June 2010). Morphometrics for Nonmorphometricians. Springer Science & Business Media. p. 163. ISBN 978-3-540-95852-9.