Rhantus orbignyi Balke, 1992
Taxonomy & Nomenclature
Synonym/s: Dytiscus nitidus?
Last Record: before 1996
Rediscovered after 1996
This species has been observed on at least 3 occasions since 2000 (Alarie et al. 2009:40; Fernández & Ruf, 2006:146). It was listed as extinct by (World Conservation Monitoring Centre, 1996), so either it has been rediscovered since 1996 or it was never in danger of being extinct and the World Conservation Monitoring Centre were wrong when they evaluated this species as extinct. Until the situation surrounding its historical status is clarified I have placed it into the rediscovered species database on account of its being declared extinct by the IUCN, and then more recent observations of the species taking place.
Argentina and Brazil
Biology & Ecology
Original scientific description:
Balke, M. (1992). Taxonomische Untersuchungen an neotropischen Wasserkäfern der Gattung Rhantus Dejean (Insecta: Coleoptera: Dytiscidae). Reichenbachia 29(6): 27-39.
Alarie, Yves et al. (2009). Larval morphology of Rhantus Dejean, 1833 (Coleoptera: Dytiscidae: Colymbetinae): descriptions of 22 species and phylogenetic considerations. Zootaxa 2317: 1–102.
Fernández, Liliana A. and Ruf, Mónica L. López. (2006). Aquatic Coleoptera and Heteroptera inhabiting waterbodies from Berisso, Buenos Aires province, Argentina. Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) 54(1): 139-148.
World Conservation Monitoring Centre. (1996). Rhantus orbignyi. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.1. (https://www.iucnredlist.org). Downloaded on 25 August 2012.