Bolitotherus cornutus

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Forked fungus beetle
A pair of Bolitotherus cornutus in copula, attacked by a second male.
A small Bolitotherus cornutus male exhibiting the use of the grip strength in the wild - journal.pone.0042738.g001.png
A scene from the video. The large male on the right attacks the smaller male on top of the female.
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Tenebrionidae
Subfamily: Tenebrioninae
Tribe: Bolitophagini
Genus: Bolitotherus
Species: B. cornutus
Binomial name
Bolitotherus cornutus
Panzer, 1794

Bolitotherus cornutus[1] is the scientific name of a species of darkling beetle that is also known under the vernacular name forked fungus beetle. As a holometabolic insect, its life cycle includes four life stages: egg, larva, pupa, and adult.


Adults are sexually dimorphic with respect to the presence of horns. Males use their two sets of horns, clypeal and thoracic, to compete for mates. Unlike many species of scarab beetles that exhibit male dimorphism for horns with major and minor morphs,[2][3][4] male B. cornutus possess a continuous range of horn and body sizes.[5][6] Bolitotherus cornutus perform reproductive behaviors on the surface of polypore shelf fungus growing on dead wood.[5] Mating pairs engage in a courtship ritual in which the male grips the female's elytra, with his thorax over the end of her abdomen. Courtship often lasts several hours, and is a necessary precursor to copulation. During a copulation attempt, the male reverses position on top of the female so that both individuals point the same direction and their abdomens are aligned. If the courtship is successful, the female opens her anal sternite and copulation takes place. Following copulation, the male remains on top, facing the same direction as the female, and mate-guards her. The male remains in this position for several hours, preventing other males from courting the female.



  1. ^ This article incorporates text from a scholarly publication published under a copyright license that allows anyone to reuse, revise, remix and redistribute the materials in any form for any purpose:
    Benowitz, K. M.; Brodie, E. D.; Formica, V. A. (2012). Proulx, Stephen R, ed. "Morphological Correlates of a Combat Performance Trait in the Forked Fungus Beetle, Bolitotherus cornutus". PLoS ONE 7 (8): e42738. doi:10.1371/journal.pone.0042738. PMC 3419742. PMID 22916153.  edit Please check the source for the exact licensing terms.
  2. ^ Lailvaux, S. P.; Hathway, J.; Pomfret, J.; Knell, R. J. (2005). "Horn size predicts physical performance in the beetle Euoniticellus intermedius (Coleoptera: Scarabaeidae)". Functional Ecology 19 (4): 632. doi:10.1111/j.1365-2435.2005.01024.x.  edit
  3. ^ Emlen DJ (1996) Artificial selection on horn length body size allometry in the horned beetle Onthophagus acuminatus (Coleoptera: Scarabaeidae). Evolution 50: 1219–1230. doi:10.2307/2410662
  4. ^ Emlen, D. J.; Corley Lavine, L.; Ewen-Campen, B. (2007). "Colloquium Papers: On the origin and evolutionary diversification of beetle horns". Proceedings of the National Academy of Sciences 104: 8661. doi:10.1073/pnas.0701209104.  edit
  5. ^ a b Conner JK (1988) Field measurements of natural and sexual selection in the fungus beetle, Bolitotherus cornutus. Evolution 42: 736–749. doi:10.2307/2408865.
  6. ^ Formica, V. A.; McGlothlin, J. W.; Wood, C. W.; Augat, M. E.; Butterfield, R. E.; Barnard, M. E.; Brodie Iii, E. D. (2011). "Phenotypic Assortment Mediates the Effect of Social Selection in a Wild Beetle Population". Evolution 65 (10): 2771–2781. doi:10.1111/j.1558-5646.2011.01340.x. PMID 21967420.  edit

Further reading[edit]