There are specific circumstances that may instigate this process, such as shared geographic isolation and a host/parasite relationship. 

Causes of Cospeciation

A specific process of speciation, the evolutionary distinction of a new species, in which the definition of one species is dependent on that of another's. 

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The mutual influence of two or more species on one another's evolution.

Coevolution

Futuyama, D.J. (2009). Coevolution. Encylopedia of Insects (Second Edition). 175-179. https://doi.org/10.1016/B978-0-12-374144-8.00060-6.

Coevolution Library

Coevolution which occurs between two species whose mutual interactions trigger specific adaptations in each other. 

Pairwise Coevolution

Coevolution that occurs when groups of species interact with other groups of species, instigating adaptations that cannot be linked to specific relationships. Demonstrates the interconnectedness between species and the selective pressures they place on one another. (aka, guild coevolution)

Diffuse Coevolution

Coevolution that is specifically defined by the genetic correspondence between species that promotes interaction with each other. (aka, matching gene coevolution) 

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