Anaspida

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Anaspida

[ə′nas·pə·də]
(paleontology)
An order of extinct fresh- or brackish-water vertebrates in the class Agnatha.
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Silurian and earliest Devonian birkeniid anaspids from the Northern Hemisphere.
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.
Unlike the predominantly longitudinal orientation of the scales on most of the body, at least some of the scales covering the pharyngobranchial region have an oblique long axis, being aligned anterodorsally to posteroventrally (Figs 5A, B, 6D) in a manner that suggests that the branchial pouches or row of branchial openings was also oblique, as it is in anaspids (Blom et al.