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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
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References in periodicals archive ?
The osteostracan and anaspid remains are not readily identified to species level, particularly with so few specimens; but they generally resemble those from the late Silurian - Early Devonian Old Red Sandstone facies (e.g., Denison 1956; Blom et al.
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.
Bolau excavated in Himmiste between 1942 and 1944, thus later than the main material of osteostracans, an anaspid and Phlebolepis elegans were collected.