Taxonomic Review of the Caudatella heterocaudata (McDunnough)‎ and C. hystrix (Traver)‎ Complexes (Insecta : Ephemeroptera: Ephemerellidae)‎

Abstract EN

Caudatella columbiella (McDunnough, 1935), new combination, (Insecta: Ephemeroptera: Ephemerellidae) is removed from synonymy with Caudatella heterocaudata (McDunnough, 1929), and a new junior synonym is recognized, based on comparative examination of type material and larval exuviae associated with adults from the type locale of C.

columbiella (=C.

californica (Allen and Edmunds, 1961), new status, new synonym).

Caudatella circia (Allen and Edmunds, 1961), new status, is recognized as a strict specific synonym of C.

heterocaudata (McDunnough, 1929) (=C.

circia (Allen and Edmunds, 1961), new synonym).

A neotype is designated for Caudatella hystrix (Traver, 1934), based on a specimen collected in Western Montana, USA, during June 2000.

Morphological differences between the type specimen of C.

hystrix and the type specimens of its two junior synonyms, Ephemerella cascadia Allen and Edmunds, 1961, and E.

spinosa Mayo, 1952, are detailed.

An identification key for larvae of the genus Caudatella is included.