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Description
ABSTRACT
Characters for identification of mature larvae of Rhantus calidus and Hoperius planatus in Georgia are evaluated and critiqued. Mature larvae of R. calidus have only eight cercal sensilla (setae) while those of Hoperius have numerous medial and lateral sensilla. This is presented as an obvious and reliable character set for identification of R. calidus and H. planatus in Georgia.
Key words: Georgia, Rhantus, Hoperius, larva, key.
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Turnbow and Smith (1) have Rhantus calidus (Fabricius) and the monotypic southeastern Hoperius planatus Fall as components of the Georgia dytiscid fauna with R. calidus as the only Rhantus species of record. Descriptive information is available for the robust and superficially similar third instars of R. calidus (2) and H. planatus (3). However, because of the inclusion of erroneous and unnecessarily difficult morphological information in Barman's (4) key to mature dytiscid larvae of Georgia, larvae of both species are likely to be identified as H. planatus.
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