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Tribe Hydaticini

Predacious Diving Beetle - Hydaticus cinctipennis Prodaticus bimarginatus (Say) - Prodaticus bimarginatus - female Predacious Diving Beetle - Hydaticus aruspex Hydaticus piceus Prodaticus bimarginatus ? - Prodaticus bimarginatus Aquatic beetle - Prodaticus bimarginatus Hydaticus bimarginatus - Prodaticus bimarginatus - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga (Ground and Water Beetles)
Family Dytiscidae (Predaceous Diving Beetles)
Subfamily Dytiscinae
Tribe Hydaticini
Numbers
2 genera, with 4 spp. in our area and ~140 spp. worldwide(1)
Size
8.5–20.5 mm(1)
Range
Hydaticus is a small (7 spp.) holarctic genus, Prodaticus is a large, mostly tropical worldwide genus, with a few holarctic spp.(1)
Works Cited
1.Phylogeny and classification of the tribe Hydaticini (Coleoptera: Dytiscidae)...
Miller K.B., Bergsten J., Whiting M.F. 2009. Zoologica Scripta, 1-25.