Aquatic Insects of Michigan by Ethan Bright, Museum of Zoology Insect Division and School of Natural Resources and Environment |
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Hydroptilidae of Michigan - Identification[under construction] Keys to the Mature (5th Instar) Larvae of Michigan Hydroptilidae 1a Abdomen dorsoventrally depressed also: Ab5-6 usually abruptly broader than other abdominal segments in dorsal aspect; case depressed, oval, made of silk with a small circular opening near each end, fastened to rock surface; basal seta of tarsal claw on each leg much shorter and thinner than the claw Leucotrichia Mosely 2a(1b) Tarsal claws stout and abruptly curved, each with a thick, pointed basal seta also: Dorsal abdominal setae thin, without basal sclerites; dorsal rings indistinct; 2 elliptical valves of silk case with few or no inclusionsStactobiella Martynov 3a(2b) Protibiae each with a prominent ventral lobe bearing short, stout setae 4 4a(3a) Thoracic legs approximately the same length 5 5a(4a) a. Gills absent from the posterior end of the abdomen b. Case protable, laterally compressed, usually consisting of 2 silk valves covered with sand or occasionally filamentous algae, but sometimes dorsoventrally depressed, with the dorsal valve carried like a tortoise shell and ventral sheet flat Ochrotrichia Mosely 6a(4b) a. Antennae long and slender, longer than the diameter of the cluster of stemmata b. Ventral lobe of each protibia parallel-sided c. Case portable, compressed, entirely of silk, shaped like a flask and opened posteriorly Oxyethira Eaton 8a(7a) a. Mesotibiae each with a pair of short, stout ventral setae located apically, or nearly apically b. Case portable, made of silk or including soft mineral material, tapered posteriorly, cylindrical but usually with longitudinal or transverse and longitudinal ridges Mayatrichia Mosely 9a(7b) a. Most abdominal segments with prominent, pointed, dorsal and ventral projections b. Flat silk case open posteriorly, reduced to small circular opening anteriorly Ithytrichia Eaton References
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