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Genus Hygrotus

Predacious Diving Beetle - Hygrotus sayi Hygrotus nubilus Hygrotus sp. - Hygrotus nubilus aquatic beetle - Hygrotus sayi aquatic beetle - Hygrotus sayi Dystiscidae ? - Hygrotus nubilus Noteridae? - Hygrotus turbidus Water Beetle - Hygrotus sayi
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga (Ground and Water Beetles)
Family Dytiscidae (Predaceous Diving Beetles)
Subfamily Hydroporinae
Genus Hygrotus
Identification
"Epipleuron with a transverse carina at humeral angle" (ref. Am. Beetles), which you can see as "the raised line" on the elytra "shoulders" in this ventral image . This characteristic separates Hygrotus from the big genus Hydroporus.