Noun
English Wikipedia has an article on:coextinctionWikipedia
coextinction (plural coextinctions)
(biology) The simultaneous extinction of two or more species (especially when one is dependent on the other)
Models suggest that coextinction is the most common form of biodiversity loss. Source: Internet
While coextinction may not be the most important cause of species extinctions, it is certainly an insidious one". Source: Internet