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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
References in periodicals archive ?
The collection comprises over 1000 osteostracan specimens with different degrees of preservation, including shield fragments of Tremataspis mammillata Patten, one part and counterpart of its disintegrated tail, many shield pieces of Dartmuthia gemmifera Patten, four fragmentary Saaremaaspis mickwitzi (Rohon), a few Tremataspis milleri Patten, one Procephalaspis oeselensis (Robertson), a single Witaaspis schrenkii (Pander) shield and three incomplete squamations of the thelodont Phlebolepis elegans Pander.
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.