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The larvae of five Nearctic species of  Ilybiosoma  Crotch,  1873 ,  I. bjorkmanae  (Hatch,  1939 ),  I. lugens  (LeConte,  1852 ),  I. minnesotensis  (Wallis,  1933 ),  I. pandurus  (Leech,  1942 ), and  I. regularis  (LeConte,  1852 ) are described for the first time including a detailed chaetotaxy analysis of the cephalic capsule, head appendages, legs, last abdominal segment and urogomphi. A provisional parsimony analysis based on 55 informative larval characteristics of 18 species in seven genera of the subfamily Agabinae was conducted using the program TNT. The larvae of the five  Ilybiosoma  species described were found to be fairly similar morphologically. Compared to the other species of Agabinae studied, larvae of  Ilybiosoma  stand out from most Agabini by the presence of the strongly emarginated siphon, which are reminiscent of the condition observed in  Hydrotrupes  Sharp,  1882  and  Platynectes  Régimbart,  1879 .

aquatic insects

Larval morphology of  Ilybiosoma  Crotch, 1873 (Coleoptera: Dytiscidae: Agabinae): description of five Nearctic species with phylogenetic considerations