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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Paralogania martinssoni (Gross), Phlebolepis elegans Pander, osteostracans Tremataspis mammillata Patten, Dartmuthia gemmifera Patten, Oeselaspis pustulata Patten, Procephalaspis oeselensis (Robertson), and anaspids Schidiosteus mustelensis Pander and Pharyngolepis?
anaspid Tahulalepis elongituberculata Blom, Marss & Miller; acanthodians Nostolepis striata Pander, Gomphonchus sandelensis (Pander), Poracanthodes porosus Brotzen.
They come from grey and greenish-grey limestones with thin interlayers of clay containing also ostracodes, bivalves, and scales of thelodonts, fragments of osteostracans and anaspids.
Silurian and earliest Devonian birkeniid anaspids from the Northern Hemisphere.
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.