unionid

plural unionids

1. biologyAny member of the family Unionidae of bivalves.

   Synonyms: unioid, unionoid

comparative more unionid · superlative most unionid

1. biologyRelating to, resembling, or characteristic of a member of the family Unionidae of bivalves.

   Mr. C[harles] T[orrey] Simpson states that no Mutelid, known to be such, has the Unionid type of hinge.

   1890 August, William Healey Dall, “Family Mutelidæ”, in Contributions to the Tertiary Fauna of Florida, […] (Transactions of the Wagner Free Institute of Science of Philadelphia; 3), part I (Pulmonate, Opisthobranchiate and Orthodont Gastropods), Philadelphia, Pa.: Wagner Free Institute of Science, […], →OCLC, page 523

   2 more examples

   The present study began with the discovery of metacercariae in the edge of the mantle of unionid bivalves collected from the Tippecanoe River, Indiana.

   1951 June, Philip G[ordon] Seitner, “The Life History of Allocreadium ictaluri Pearse, 1924 (Trematoda: Digenea)”, in The Journal of Parasitology […], volume XXXVII, number 3, Chicago, Ill.: American Society of Parasitologists, →ISSN, →OCLC, page 226

   Articulated unionid shells, many in life position in channel lag (cl) below a thin clay bed (c), in turn overlain by a shelving sandstone (SS) with Lockeia in its sole face and with escape structures.

   2005, Paul A[nthony] Johnston, Austin J[ohn] W[ebb] Hendy, “Paleoecology of Mollusks from the Upper Cretaceous Belly River Group”, in Philip J[ohn] Currie, Eva B[undgaard] Koppelhus, editors, Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed (Life of the Past), Blomington, Ind.: Indiana University Press, →ISBN, part 2 (Flora and Fauna from the Park), page 145

   Synonyms: unioniform, unionoid