Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

National Moth Week photos of insects and people. Here's how to add your images.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa


Genus Rhantus

Predaceous Diving Beetle - Rhantus sericans - female Predaceous Diving Beetle- Rhantus binotatus - Rhantus binotatus - male Dytiscid - Rhantus wallisi Predaceous Diving Beetle - Rhantus binotatus Which Rhantus - Rhantus binotatus - male Dytiscid - Rhantus gutticollis Dytiscid - Rhantus gutticollis diver - Rhantus gutticollis
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 Colymbetinae
Tribe Colymbetini
Genus Rhantus
Explanation of Names
Rhantus Dejean 1833
in our area, 10 spp., 7 of which are found in Canada and Alaska(1)
8.5-16 mm
eyes notched at antennal bases
no row of setae on ventral posteroapical angle of hind femur
hind tarsal claws unequal
elytra sculpture with various degrees of reticulation (in similar genus Colymbetes, elytra sculpture consists of transverse parallel grooves)
head and pronotum variously patterned with black markings/blotches; overall colour ranges from yellow brown to black
The individual species can be distinguished from each other by differences in the black maculation of the head and pronotum, absence/presence of pronotal spots and also colour of the elytron.
holarctic; throughout North America
wide range of habitats; in both standing and running water, also bogs, springs, and even saline ponds
Life Cycle
Univoltine; adults overwinter and breed in spring; larvae develop in spring and summer and emergent adults dispersing to overwintering sites in late summer and fall(1)
2 subgenera, of which Nartus is represented in NA by R. sinuatus(1)
Internet References
quality images of 4 spp. (pinned specimens)