Megacyllene robiniae
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Megacyllene robiniae, commonly known as the locust borer, is a species of longhorn beetle endemic to eastern North America. It is a serious pest of Robinia pseudoacacia, the black locust tree, with wh
Adult on Solidago
Male (left) and female (right) mating
Species
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A species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. It can be defined as the largest group of organisms in which any two individuals o
All adult Eurasian blue tits share the same coloration, unmistakably identifying the morphospecies.
Ernst Mayr proposed the widely used Biological Species Concept of reproductive isolation in 1942.
Palaeontologists are limited to morphological evidence when deciding whether fossil life-forms like these Inoceramus bivalves formed a separate species.
Blackberries belong to any of hundreds of microspecies of the Rubus fruticosus species aggregate.