Lacking organized tissue structure; not composed of histological tissues or organs.
From Ancient Greek 'an-' (not) + 'histo-' (tissue) + '-ous' (adjective suffix). An alternative form of anhistic, both describing organisms without differentiated tissues.
Parasitic worms and some larvae are anhistous in their early stages—they're basically just squirmy tubes with a mouth and digestive system, showing how life can work without the sophisticated tissue organization we're used to!
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