anaspid


Also found in: Dictionary, Encyclopedia.
Graphic Thesaurus  🔍
Display ON
Animation ON
Legend
Synonym
Antonym
Related
  • noun

Words related to anaspid

extinct small freshwater jawless fish usually having a heterocercal tail and an armored head

References in periodicals archive ?
The first assemblage of vertebrates to be described from the Eastport Formation of Maine, USA, includes agnathan remains comprising scale fragments of osteostracans and anaspids, and scales of thelodonts.
Silurian and earliest Devonian birkeniid anaspids from the Northern Hemisphere.
carinatus (Pander), Thelodus sp., 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?
sp.; anaspid Tahulalepis elongituberculata Blom, Marss & Miller; acanthodians Nostolepis striata Pander, Gomphonchus sandelensis (Pander), Poracanthodes porosus Brotzen.
martinssoni occurs together with the thelodont Thelodus laevis (Pander), the osteostracans Tremataspis schmidti Rohon, Tremataspis milleri Patten, Saaremaaspis mickwitzi (Rohon), Oeselaspis pustulata Patten, Witaaspis schrenkii (Pander), Thyestes verrucosus Eichwald, and the anaspids Rhyncholepis parvula Kiaer, R.
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.
Other vertebrates in the samples comprise Thelodus parvidens Agassiz, Thelodus sculptilis Gross, two to three different cyathaspidid heterostracans, two anaspids, two osteostracans, and acanthodians Nostolepis striata Pander, Gomphonchus sandelensis (Pander), and Poracanthodes porosus Brotzen.
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.