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Examining the highlighted area of your specimen, click on the image below which most closely resembles your specimen.
Mandibular fan (mf) with
25 or more rays
Mandibular fan (mf) with
16 to 18 rays
Mandibular fan (mf) with 12 rays
Phylum Arthropoda
Subphylum Hexapoda
Class Insecta
Order Diptera
Family Chaoboridae
Genus Chaoborus