Tuesday, June 5, 2007
549

First Nearctic records of Oliveiriella Wiedenbrug and Fittkau (Chironomidae, Orthocladiinae) and new distributional records for two Neotropical chironomids

Brian J. Krestian1, Ely Kosnicki1, Shann Stringer2, and Patrice Spindler3. (1) EcoAnalysts Inc., 105 E. 2nd. St., Suite 1, Moscow, ID 83843, (2) Surface Water Quality Bureau, Monitoring and Assessment Section, New Mexico Environment Department, Harold Runnels Bldg., N2052, 1190 St. Francis Dr., P.O. Box 26110, Santa Fe, NM 87502, (3) Water Quality Division, Arizona Department of Environmental Quality, 1110 West Washington Street, Phoenix, AZ 85007

As federal, state and local agencies continue to use aquatic macroinveterbrates as biological indicators of water quality, it is important that taxonomic and distributional information be constantly updated.  During the course of processing benthic macroinvertebrate samples provided by federal and state agencies, taxonomists at EcoAnalysts, Inc. identified larvae and pupae of the Neotropical chironomids Oliveiriella Wiedenbrug and Fittkau (Orthocladiinae) and Onconeura semifimbriata (Saether) (Orthocladiinae) from sites in New Mexico and Arizona, USA.  These occurrences represent the first Nearctic records of Oliveiriella and expand the Nearctic range of Onconeura semifimbriata.  We also identified larvae of Tempisquitoneura merrillorum Epler (Chironomidae, Orthocladiinae) from 1 site in Nevada and 2 sites in Utah, USA.  These state records expand the Nearctic range for T. merrillorum.  All three of these genera are very similar in appearance to other commonly encountered genera, but are not included in any of the current taxonomic keys for North America.

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