Genus

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In academic English the preferred plural of genus is genera. Never be tempted to say genuses.

Genus is a Latin noun, belonging to a group of nouns ending in -us which form the regular plural ending in -era. (See -a in Latin.) As so often in English, academics love to use the appropriate Latin - even if they don't speak the language. (Very few do, these days.)

Its commonest use in English is in Biological sciences, where it means 'a collection or group of species sharing certain structures in common'. (The borderline between a species and a genus can be a source of argument and discussion among experts. But differentiation into species and genera is the heart of the Linnaean system of identifying and classifying living things.)