noun
taxon
A biological term for any taxonomic group, such as a species, genus, family, or order.
この分類群には多くの種が含まれている。
This taxon includes many species.
分類 means 'classification' in general, while 分類群 specifically refers to a taxonomic group in biology.
Compound of 分類 (classification) and 群 (group). The exact historical derivation is uncertain, but the term is used in modern biological taxonomy.