Relating to or characteristic of agnathostomata; having the features of jawless-mouthed fish and creatures.
From 'agnathostomata' plus the adjective suffix '-ous.' It describes the characteristics of organisms lacking true jaws but possessing specialized mouth structures.
This adjective appears mainly in scientific papers about vertebrate evolution—studying agnathostomatous creatures helps us understand how jaws evolved, one of the most important innovations that let fish eventually become us.
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