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

Interested in a 2022 BugGuide gathering in New Mexico?

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

National Moth Week 2020 photos of insects and people.

Photos of insects and people from the 2019 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.

Previous events


Genus Triplax

Pleasing Fungus Beetle - Triplax festiva Pleasing Fungus Beetle - Triplax californica  Pleasing Fungus Beetle - Triplax thoracica beetle - Triplax thoracica Triplax sp.  (Triplax dissimulator?) - Triplax dissimulator beetle in oyster mushroom, fall - Triplax thoracica Triplax macra Washington Beetle - Triplax californica? - Triplax
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Cucujoidea (Sap, Bark and Fungus Beetles)
No Taxon (Erotylid series)
Family Erotylidae (Pleasing Fungus Beetles)
Subfamily Erotylinae (Pleasing Fungus Beetles)
Tribe Tritomini
Genus Triplax
Explanation of Names
Triplax Herbst 1793
Greek for "triple, three-fold"
18 spp. in our area, dozens worldwide(1), 9 spp. in Canada(2)
4-7 mm
Most species have reddish-orange pronotum and black elytra; T. festiva has broad orange band across middle of elytra. Larvae are known for many species, but none have been formally described.
worldwide and throughout NA (US and so. Canada), as follows:(1)(3)
1 transcontinental sp. (T. thoracica)
8 eastern spp., of which 3 range into Canada and one is FL endemic)
4 western spp., of which 3 range into Canada
4 southwestern spp.
1 sp. restricted to TX
in woodlands on gill or polypore fungi(4)
Apr-Oct in IL; year-round in southern states
larvae and adults feed either on Pleurotus (Tricholomataceae) or Polyporaceae, esp. Inonotus(4)(3)
Print References
Boyle W.W. (1962) A new species of Triplax from Arizona (Coleoptera: Erotylidae). Pan-Pacific Entomologist 38(1): 29-30.
Goodrich M.A., Skelley P.E. (1997) New synonymy in the genus Triplax Herbst (Coleoptera: Erotylidae), with notes on the biology of Triplax californica LeConte. Annales Zoologici (Warszawa) 47(1/2): 55-58.
Internet References
Goodrich M.A., Skelley P.E. The Pleasing Fungus Beetles of Illinois
Works Cited
1.Skelley P.E. (2001) Pleasing fungus beetles of North America: Family Erotylidae
2.Checklist of beetles (Coleoptera) of Canada and Alaska. Second edition
Bousquet Y., Bouchard P., Davies A.E., Sikes D.S. 2013. ZooKeys 360: 1–402.
3.The Erotylidae and Endomychidae (Coleoptera: Cucujoidea) of the Maritime Provinces of Canada...
C.G. Majka. 2007. Zootaxa 1546: 39–50.
4.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.