A cytological study of the Prosimulium onychodactylum complex (Diptera, Simuliidae)

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Abstract
This paper extends the known geographical and temporal distributions of forms of the morphospecies Prosimulium onychodactylum and consequently supplements the study of Newman (L. J. Newman. 1983, Can. J. Zool 61:2816-2835). Larvae were collected from 65 sites in northwestern North America, and six forms were observed. Forms 2a, 2b, and 4a/4b were previously characterized by Newman and forms 8, 9, and 10 are described here for the first time. Form 10 may be conspecific with Newman''s form 6. Form 9 from the Yukon, with a unique Y chromosome inversion, may be a geographic variant of Newman''s form 2. Form 8, characterized by a large chromocenter, is specifically distinct from all other forms. A cytophylogeny is given which indicates the chromosomal relationships among the forms presently recognized.

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