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Review of first-instar larvae of Colymbetini (Coleoptera: Dytiscidae), with a key to genera and phylogenetic analysis

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image of Insect Systematics & Evolution

The first-instar larva of Meladema coriacea Laporte, 1835 is redescribed, and that of Neostutopterus hornii (Crotch, 1873) is described for the first time. A generic key to first-instar larvae of Colymbetini is presented, but it does not include the monobasic New World genera Bunites Spangler and Hoperius Fall, whose young larvae are unknown. Polarity is determined for a set of 12 characters of first-instar larvae, and the distribution of character states among genera is used to reconstruct phylogeny. It suggests that Meladema Laporte and Neoscutopterus J. Balfour-Browne together form the most derived lineage of the Colymbetini, whereas Colymbetes Clairville is the least derived genus.

Affiliations: 1: A. N. Nilsson, Department of Animal Ecology, University of UmeÅ, S-901 87 UmeÅ, Sweden; 2: W. L. Hilsenhoff, Department of Entomology, University of Wisconsin, Madison, WI 53706 U.S.A.


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