anaspid


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Noun1.anaspid - extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian
agnathan, jawless fish, jawless vertebrate - eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
Anaspida, order Anaspida - extinct order of jawless vertebrates
References in periodicals archive ?
diomedea; similarly, no serotonergic perikarya are present in the pleural ganglia of the anaspid Aplysia californica Cooper, 1863 (Langley and Langley, 1986), and none were detected in the right pleural ganglion of Asperspina (see Fig.
elegans shoal has preserved in a lens-like fish bed with rare ostracods and a few osteostracans (Tremataspis and Dartmuthia) occurring on the same bedding plane, while most of osteostracan and anaspid exoskeletons were buried under more agitated water conditions.