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Noun1.osteostracan - extinct jawless fish of the Devonian with armored head
agnathan, jawless fish, jawless vertebrate - eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
Cephalaspida, Osteostraci, suborder Cephalaspida, suborder Osteostraci - extinct group of armored fish-like vertebrates; taxonomy is not clear
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References in periodicals archive ?
The presence of osteostracan, anaspid, thelodont, acanthodian and possible placoderm remains in the Eastport Formation of Maine mirrors the vertebrate fauna known elsewhere in the Lower Old Red Sandstone of eastern North America and Europe (e.g., Denison 1956; the 'Cephaslaspid province of Young 1981; the North Atlantic province of Dineley and Loeffler 1993; and the 'central Appalachian zone' of Blieck and Janvier 1999, Burrow et al.
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.
However, the acanthodians, thelodonts and osteostracans from the majority of the Gotland stratigraphy are still in need of taxonomic review and revision.
carinatus (Pander), Paralogania martinssoni (Gross), Phlebolepis elegans Pander, osteostracans Tremataspis milleri Patten, Tr.
Vertebrates are represented in the Riksu drill core by the scales of thelodonts and shield fragments of osteostracans. Three distinctive assemblages of agnathans are recognized in the Riksu and Rootsikula formations (Wenlock) and in the Paadla Formation (Ludlow).
Luha produced only a short paper on osteostracans of Saaremaa (Luha 1940), but more than 70 examples were studied in Oslo and named Coelolepis luhai Kiaer, 1932, in a paper that was edited by A.
During the study of Estonian Silurian osteostracans and the thelodont Phlebolepis elegans Pander in the Geological Museum at the University of Tartu, material found by Edmund Bolau at the time of the 2nd World War in the Himmiste Quarry, Saaremaa Island, caught my attention.