An extinct or archaic group of fish with cartilaginous skeletons and ganoid scales, representing an early stage of fish evolution.
From Greek 'chondros' (cartilage) + 'ganoid' (shiny scale type), a taxonomic term used in 19th-century ichthyology to classify ancient fish groups.
These ancient fish are evolutionary cousins of modern sharks and rays—they had cartilage skeletons like sharks but shiny ganoid scales you'd never see in fish today.
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