A taxonomic group or subgroup designation (plural form) for spiny-finned fish in systematic biological classification.
Latin plural form of 'acanthodeus,' derived from the Greek 'akantha,' used in formal Linnaean taxonomic nomenclature.
Taxonomists loved using Latin plurals to make classifications sound grand—'acanthodei' is basically the fancy plural way of saying 'all those spiny ancient fish' in one word.
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