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Assumed Amphi-Atlantic distribution of Oxyurella tenuicaudis (Cladocera, Chydoridae) denied by a new species from North America by R. George Michael; David G. Frey is a Environmental Science article available to read on EtoBox.

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Up to now the taxon Ox yurella tenuicaudis, described from Norway, has been claimed to occur in North America as well . However, our close study and comparison of populations from the two continents show them to be different in many major morphological details, involving principally the female and male postabdomens, labrum, headpore configuration, and the external sculpturing of the shell . The new species O. brevicaudis occurs from the Maritimes to Manitoba in southern Canada, southward throughout the region east of the Plains to Guatemala and possibly Panama . Two enigmatic outlier populations are known from the Northwest Territories and the State of Washington . A greater frequency of occurrence in the southeastern states compared with southern Canada, together with its extension of range into the Tropics, suggests that this taxon prefers the lower north temperate latitudes . Although widely distributed, its frequency of occurrence is very low . Just as interesting as the characters that separate these two species are those that unite them into the cohesive genus Oxyurella . Although the few other species in the genus have not been studied in sufficient detail, fragmentary infor

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Author

R. George Michael; David G. Frey

Publisher

Springer; Springer-Verlag; Springer (Kluwer Academic Publishers); Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 1573-5141)

Published

1983

Language

EN

Field

Environmental Science (Physical Sciences)