• Home
• Key to Nymph Families
• Key to Adult Families
• Checklist
• References
• Terms
• Aquatic Macros

1.         Head suborbicular with collum (neck) narrow and distinct; mandible without retinaculum (tooth)             on inner margin; nasale with median produced lobe, whtich may or may not be emarginate, and             with a lower tooth on each side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dineutus sp.

            Head elongate, with collum not distinct, nearly as wide as remainder of head; mandible with             retinaculum or without . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.         Nasale with 2-3 teeth in a transverse row. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gyrinus sp.

            Nasale without teeth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gyretes sinuatus

[Home][Back to Nymph Families]