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Callosobruchus maculatus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Chrysomelidae
Genus: Callosobruchus
Species: C. maculatus
Binomial name
Callosobruchus maculatus
(Fabricius, 1775)

Callosobruchus maculatus, the bruchid beetle or the cowpea weevil, is a species of reddish-brown slightly elongate beetle. Although weevil-like they are not true weevils (Curculionidae) and do not have heads prolonged into a long "snout". Wing covers (elytra) are marked with black and gray and there are two black spots near the middle. They are considered pests. Adults move about readily and can infest seeds in the field, but can also breed continuously in stored dry cowpeas. Larvae typically develop inside the dried peas. Larvae chew near the surface and leave a thin covering uneaten which appears as a window from which the adults emerge.

The penis of a Callosobruchus maculatus beetle

Males of Callosobruchus maculatus have spines on their intromittent organs that puncture the female reproductive tract during mating. Females kick their mates during copulation. If females are prevented from kicking the males, copulations last longer and the injuries females sustain are more severe[1]. This interesting behaviour makes them a unique model organism to study sexual selection and conflict. It has been found out that the spines have evolved for other reasons than harming the females, such as serving as an anchor during copulation, and that the harm they cause is a side effect of a male adaptation and is not itself adaptive for either sex.


  1. ^ M. Edvardsson & T. Tregenza (2005). "Why do male Callosobruchus maculatus harm their mates?". Behavioral Ecology 16 (4): 788–793.  


Up to date as of January 23, 2010

From Wikispecies


Main Page
Cladus: Eukaryota
Supergroup: Unikonta
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Cladus: Dicondylia
Cladus: Pterygota
Cladus: Metapterygota
Cladus: Neoptera
Cladus: Eumetabola
Cladus: Endopterygota
Superordo: Coleopterida
Ordo: Coleoptera
Subordo: Polyphaga
Infraordo: Cucujiformia
Cladus: Phytophaga
Superfamilia: Chrysomeloidea
Familia: Chrysomelidae
Subfamilia: Bruchinae
Tribus: Bruchini
Genus: Callosobruchus
Species: Callosobruchus maculatus


Callosobruchus Fabricius, 1775


Seed beetle Callosobruchus maculatus (F., 1775) (Bruchidae) - atlas of beetles of Russia (Photo by D.G. Kasatkin)


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