Journal
PALEONTOLOGICAL JOURNAL
Volume 41, Issue 9, Pages 861-949Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0031030107090018
Keywords
Didacna; Quaternary; Ponto-Caspian
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The history of the Quaternary genus Didacna, which is endemic to the Ponto-Caspian Sea, is discussed. Quaternary stratigraphy of this region and Didacna assemblages recorded in the Neopleistocene sequence are characterized. The development of this genus against the background of the Ponto-Caspian history is reconstructed; the replacement of species and associations of Didacna, the character of speciation, and examples of homeomorphism are discussed. Seventy-seven species of this genus, which appeared over slightly more than 600 thousand years, are described; this indicates an extremely intense speciation in Pleistocene brackish-water basins, which were inhabited by only five bivalve genera belonging to two families.
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