First instars of Rhantus calidus (Fabricius) representing a Georgia population are described and illustrated. Dimensions are provided along with an analysis of the primary chaetotaxy of legs, head, and last abdominal segment. The presence of first instars at the study site demonstrated that R. calidus either requires or is at least tolerant of warmer temperatures for completion of its life cycle. Habitats with temperatures comparable to this site were likely present in a warm Atlantic coastal enclave during the last glacial maximum (LGM), making it probable that the LGM dytiscid fauna of Georgia included R. calidus.
Lemieux, B. R.; Barman, E. H.; and White, B. P.
"A Redescription of the First Instar of Rhantus calidus (Fabricius) (Coleoptera: Dytiscidae) with Notes on its Biology,"
Georgia Journal of Science, Vol. 69, No. 2, Article 1.
Available at: https://digitalcommons.gaacademy.org/gjs/vol69/iss2/1