''Theora'' is a
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...
of saltwater and freshwater
clams
Clam is a common name for several kinds of bivalve molluscs. The word is often applied only to those that are edible and live as infauna, spending most of their lives halfway buried in the sand of the seafloor or riverbeds. Clams have two sh ...
,
bivalve
Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, biv ...
molluscs in the family
Semelidae
The Semelidae are a family of saltwater clams, marine bivalve molluscs in the order Cardiida.
Description
Members of this family have rounded or oval, elongated shells, much flattened. The two valves are connected by an internal ligament in con ...
.
Species
Species accepted as of October 2021:
*''
Theora alfredensis
Theora is a free lossy video compression format. It is developed by the Xiph.Org Foundation and distributed without licensing fees alongside their other free and open media projects, including the Vorbis audio format and the Ogg container.
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*''
Theora iridescens
Theora is a free lossy video compression format. It is developed by the Xiph.Org Foundation and distributed without licensing fees alongside their other free and open media projects, including the Vorbis audio format and the Ogg container.
...
''
*''
Theora lata
Theora is a free lossy video compression format. It is developed by the Xiph.Org Foundation and distributed without licensing fees alongside their other free and open media projects, including the Vorbis audio format and the Ogg container.
...
''
*''
Theora lubrica
''Theora lubrica'' is a bivalve mollusc endemic to the Northwest Pacific, including northern Japan, southern Russia and Hong Kong. It was introduced into harbours around the North Island of New Zealand around 1972, and has since spread to the up ...
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*''
Theora mesopotamica
''Theora mesopotamica'' is a species of Seawater, saltwater and brackish water clam, a bivalve mollusk in the family Semelidae. This species is known from the northwestern end of the Persian Gulf, and from subfossil remains in brackish deposits i ...
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*''
Theora moulinsii
Theora is a free lossy video compression format. It is developed by the Xiph.Org Foundation and distributed without licensing fees alongside their other free and open media projects, including the Vorbis audio format and the Ogg container.
...
''
*''
Theora nasuta
Theora is a free lossy video compression format. It is developed by the Xiph.Org Foundation and distributed without licensing fees alongside their other free and open media projects, including the Vorbis audio format and the Ogg container.
...
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*''
Theora opalina
Theora is a free lossy video compression format. It is developed by the Xiph.Org Foundation and distributed without licensing fees alongside their other free and open media projects, including the Vorbis audio format and the Ogg container.
...
''
*''
Theora translucens
Theora is a free lossy video compression format. It is developed by the Xiph.Org Foundation and distributed without licensing fees alongside their other free and open media projects, including the Vorbis audio format and the Ogg container.
...
''
;Synonyms:
* ''Theora cadabra''
(Eames & Wilkins, 1957) accepted as ''Theora mesopotamica''
(Annandale, 1918) (junior synonym)
* ''Theora fragilis''
(A. Adams, 1856) accepted as ''Theora lata''
(Hinds, 1843)
* ''Theora hindsiana''
Preston, 1916 accepted as ''Theora iridescens''
(Hinds, 1843)
* ''Theora nitida''
Gould, 1861 accepted as ''Theora lata''
(Hinds, 1843)
* ''Theora ovalis''
E. A. Smith, 1904 accepted as ''
Aligena ovalis''
(E. A. Smith, 1904) (original combination)
References
* Vaught, K.C.; Abbott, R.T.; Boss, K.J. (1989). A classification of the living Mollusca. American Malacologists: Melbourne. . XII, 195 pp
External links
*
Adams, H. & Adams, A. (1853-1858). The genera of Recent Mollusca; arranged according to their organization. London, van Voorst. Vol. 1: xl + 484 pp.; vol. 2: 661 pp.; vol. 3: 138 pls.Adams, A. (1864). On the species of Nearea found in the seas of Japan. Annals and Magazine of Natural History. (3) 13: 206-209Stoliczka F. (1870-1871). The Pelecypoda, with a review of all known genera of this class, fossil and recent. [in] T. Oldham, Paleontologia Indica, being figures and descriptions of the organic remains procured during the progress of the Geological Survey of India. Cretaceous Fauna of Southern India. Volume 3. Memoirs of the Geological Survey of India, Calcutta. pp. i-xxii, 1-537, pl. 1-50
Semelidae
Bivalve genera
{{bivalve-stub