Morphology of 'Cypretta kawatai' Sohn and Kornicker, 1972 (Crustacea, Ostracoda), with a Discussion of the Genus. Smithsonian Contributions to Zoology Number 141

摘要

All 34 species previously referred to Cypretta are reviewed, and four of these are removed from the genus because they lack the characteristic anterior septate margins. The morphology of septa along the anterior margins is discussed and illustrated. The life cycle of C. kawatai was observed in the laboratory, where the species proved to be parthenogenetic. Ontogenetic studies showed the following: in dorsal view the outline changes from pointed ends and greatest width at approximate midlength in early stages to a blunter posterior end and greatest width at a distance of approximately one-third Irom the posterior end in adults; the lateral outline changes from subtriangular in early stages to subovate in adults. The following characters are restricted to adults: septate anterior margins; ventroposterior nodes on the right valve and opposing scalloped structures on the left valve; columns on the anterior margin of both valves that are either superposed on or adjacent to the septa and are present on the ventroposterior margin of the right valve only. A lectotype is designated for Cypretta globulosa (Sharpe, 1910), considered here to be a valid species.