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Pronunciation varies by accent · noun
(zoology) Any member of the family Unionidae or its order Unionida of freshwater mussels..
II. n. Same as unionid.
Carbonicola, of the Devonian and Carboniferous, comprises Unionoid Bivalves, with thick shells, an external ligament, and a concentrically-striated surface.
I know nothing of that of Solenaia beyond the statement of Fischer regarding its greatly developed, mushroom shaped foot and its burrowing habit. It is, I am satisfied, an unionoid animal and the fact that there is a decided posterior pallial sinus to the shell leads me to believe that it has two siphons.
The current record of Australian Lower Cretaceous non-marine macroinvertebrates is substantial but mainly limited to a few highly productive localities. Some remains have been recovered from near-shore marine rocks including the Valanginian Trinity Well Sandstone Member of the Cadna-owie Formation (South Australia) and the Aptian Wallumbilla Formation (White Cliffs, New South Wales). These have produced freshwater unionoid bivalves (Alathyria coatsi, Hyridella whitecliffsensis) and Australia’s oldest known non-marine gastropod – the viviparid Notopala alboscopularis.
Use unionoid when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Unionoid means (zoology) Any member of the family Unionidae or its order Unionida of freshwater mussels..
Common synonyms include unioid, unionid, unioniform.
The opposite depends on the specific sense.
II. n. Same as unionid.
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