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Genus Platambus

Predacious Diving Beetle - Platambus semivittatus predaceous diving beetle - Platambus semivittatus - female predaceous diving beetle - Platambus semivittatus - female Platambus flavovittatus - male predaceous diving beetle - Platambus semivittatus predaceous diving beetle - Platambus semivittatus Platambus stagninus - male Platambus apache
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga
Family Dytiscidae (Predaceous Diving Beetles)
Subfamily Agabinae
Tribe Agabini
Genus Platambus
Synonyms and other taxonomic changes
All species formerly placed in Agabus(1)
Explanation of Names
Platambus Thomson 1859
Numbers
at least 10 species in the US, 2 in se. Canada; 67 total(1)(2)

Four species groups in the Nearctic:
P. confusus group:
P. confusus

P. optatus group:
P. obtusatus
P. planatus

P. semivittatus group:
P. astrictovittatus
P. flavovittatus
P. johannis
P. semivittatus
P. stagninus
P. texovittatus

P. spinipes group:
P. apache
Size
5-10 mm(2)
Identification
Most individuals in the P. semivittatus group have a subapical lateral pale stripe on each elytron. Most specimens require dissection and examination of male protarsal claws to id.
Range
Holarctic (ranging into Mesoamerica) & Oriental, by far more diverse in the Old World(2); highest diversity in the Nearctic is in the eastern US, and the coastal plain in particular
Works Cited
1.A World Catalogue of the Family Dytiscidae, or the Diving Beetles (Coleoptera, Adephaga)
Nilsson and Hajek. 2019. Distributed by authors.
2.Diving beetles of the world: systematics and biology of the Dytiscidae
Miller K.B., Bergsten J. 2016. JHU Press. 336 pp.