Graphoderus
Graphoderus
Classification
- Phylum: Arthropoda
- Subphylum: Hexapoda
- Class: Insecta
- Order: Coleoptera
- Suborder: Adephaga
- Family: Dytiscidae
- Subfamily: Dytiscinae
- Tribe: Aciliini
- Genus: Graphoderus
Pronunciation
How to pronounce Graphoderus: //ɡræˈfoʊdərəs//
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Summary
Graphoderus is a genus of predaceous diving beetles belonging to the family Dytiscidae. With 12 extant species, they are mostly distributed in northern regions of North America and are typically found in aquatic environments.
Physical Characteristics
Adults range from 10.4 to 15 mm in size. Larval stages are similar in appearance and size to Acilius larvae but can be distinguished by the structure of the ligula, which is unifid compared to the bifid ligula of Acilius.
Identification Tips
Look for the unifid ligula in larvae to differentiate from Acilius larvae.
Habitat
Primarily found in standing water such as ponds and eutrophic lakes, typically in open, sun-warmed areas.
Distribution
Transcontinental across Canada and most of the northern United States; the species G. liberus extends south to Florida in the eastern U.S.
Diet
Larvae are aquatic predators, while adults may be predators or scavengers in their respective habitats.
Life Cycle
Graphoderus is univoltine, with adults overwintering and mating in the spring and larvae maturing by early to mid-summer.
Reproduction
Adults mate in spring; the specifics of reproductive behavior are not detailed.
Ecosystem Role
As predatory beetles, they play a role in controlling the populations of other aquatic invertebrates.
Collecting Methods
- Hand collecting from aquatic habitats
- Pitfall traps
Preservation Methods
- Ethanol preservation
- Drying and pinning for adults
Similar Taxa
Tags
- beetle
- Dytiscidae
- Graphoderus
- aquatic insects
- predators