The Fringed Diving Beetle

Cybister fimbriolatus

This giant diving beetle is listed as a species of predaceous diving beetle found in North America.  They are found in aquatic environments and both larvae and adult prey on aquatic insects and fish. I found this particular one, already deceased, on the ground beside one of the watering troughs on a recent ranch visit.  Its green and yellow hard outer wings, that I have since learned are called elytra, were hard to miss as they stood out in quite stark contrast to the red, sandy soil that it lie motionless on. 

The beetle’s hard outer wings are called elytra.

A few beetle basics:

  • Most beetles are able to fly.
  • Some beetles, such as the Fringed Diving Beetle, are able to swim.
  • Beetles wear their skeletons on the outside—exoskeletons.   
  • Beetle bodies are divided into three (3) parts:   head, thorax, and abdomen. 
  • Beetles’ eyes are compound, which allow them to see many views of something all at once. 
  • The four stages of the beetle’s life cycle are:  egg, larva, pupa, and adult.

The larva of this beetle are known as “water tigers.”

Taxonomy
Kingdom: Animalia
Phylum: Arthropoda
Subphylyum: Hexapoda
Class: Insecta
Subclass: Pterygota
Order: Coleoptera
Suborder: Adephaga
Superfamily: Dytiscoidea
Family: Dytiscidae
Subfamily: Cybistrinae
Genus: Cybister

Fringes on its hind legs help it float and swim. 

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