Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
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Fall Fund Drive


Genus Hygrotus

Coleoptera: Dytiscidae: Hygrotus sayi - Hygrotus sayi water beetle - Hygrotus sayi Predacious Diving Beetle - Hygrotus sayi Diver #1 - Hygrotus sayi Diver #10 - Hygrotus sayi Predaceous Diving Beetle - Hygrotus sayi Predaceous Diving Beetle - Hygrotus sayi Hygrotus? - Hygrotus sayi
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 Hydroporinae
Tribe Hydroporini
Genus Hygrotus
Explanation of Names
Hygrotus Stephens 1828
~40 spp. in our area (38-43, depending on source)(1)(2)
"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.
Works Cited
1.The Water Beetles of Florida
Epler J.H. 2010. Florida Department of Environmental Protection. Tallahassee. 414 pp.
2.American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia
Arnett, R.H., Jr., and M. C. Thomas. (eds.). 2000. CRC Press LLC, Boca Raton, FL.