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Chironomus utahensis malloch and chironomus harpi new species and their karyosystematic relationships to other species in the decorus group of chironomus chironomidae diptera



Chironomus utahensis malloch and chironomus harpi new species and their karyosystematic relationships to other species in the decorus group of chironomus chironomidae diptera



Spixiana 14(1): 71-94



Adult, pupal and larval morphology and karyotypes of Chironomus utahensis Malloch and Chironomus harpi, spec. nov. are described. Adults of C. utahensis resemble chironomus atrella (Townes) and c. anthracinus Zetterstedt; however, the rsemblance is apparently from convergence. The dark coloration, clypeus narrower than the antennal pedicel, long foretarsal beard, short, rather broad, pale and point and the almost straight superior volsella will differentiate it from other members of the genus. Adults of C. harpi most closely resemble C. decorus Johannsen and C. maturus Johannsen but the male genitalia are distinctive in having an almost straight superior volsella which is blunt tipped and a narrower anal point with a weakly delimited tongue-like apical lobe. While the larvae and pupae of the Nearctic Chironomus are still inadequately known, the dark antennal pedicel of the larval C. utahensis appers to be a distinctive feature. Karyosystematically, C. utahensis and c. harpi are closely related. Although none of the seven chromosome arms is identical in both species, the banding patterns can be derived by only a few inversion diffierences. Both species belong to a karyosystematically defined, possibly monophyletic "decorus-group" in which at least C. utahensis has a relatively basal position. Inversion polymorphism has been recorded in chromosome arms A, C, D, E, F and G of C. utahensis whereas in C. harpi only an inversion in arm G has been found. Chironomus rtahensis lives in ponds and lakes in western North America. C. harpi, known from Arkansas, Missouri, Illinois, and New York in USA, and New Brunswick in Canada, inhabits saline or acid lentic biotopes.

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