Osteostraci - Wikipedia
The class Osteostraci (meaning "bony shells") is an extinct taxon of bony-armored jawless fish, termed "ostracoderms", that lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devonian.
Ostracoderm - Wikipedia
Osteostraci ('bony-shells') lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devonian. Anatomically speaking, the osteostracans, especially the Devonian species, were among the most advanced of all known agnathans.
Osteostraci | fossil vertebrate order | Britannica
…jawless fishes of the order Osteostraci. Somewhat later in the Silurian from the same region, layers contain fragments of jawed acanthodians, the earliest group of jawed vertebrates, and of jawless fishes.
Cephalaspidomorphi: Osteostraci - Palaeos
The Osteostraci, like other pregnathostome craniates, had only two pairs of semicircular canals in the labyrinth. That is, their kinesthetic sense was somewhat handicapped in dealing with fully three-dimensional movement.
Endemicity and palaeobiogeography of the Osteostraci and …
2009年11月13日 · The Osteostraci and Galeaspida are characterized by large, fused, cephalic shields which, combined with their shallow marine, lagoonal, estuarine and freshwater environments, give them a high preservation potential and thus extensive record.
Silurian-Devonian Jawless Fish were Ecologically Diversified
2020年10月5日 · Osteostraci, the jawless sister group to all jawed vertebrates, had adaptations for passive control of water flow around the body, according to new research led by the University of Bristol.
Osteostraci - Encyclopedia.com
2018年5月8日 · Osteostraci An order of fossil, fish-like, jawless vertebrates that had a flattened head covered by a bony shield with a series of small gill openings on the side. Usually small (30 cm), they ranged from the Silurian to the Devonian Periods.
Osteostraci - Tree of Life Web Project
The Osteostraci, or osteostracans, are a major clade (about 200 species) of fossil, armored jawless vertebrates which lived from the Early Silurian (about 430 million years) to the Late Devonian (about 370 million years).
The origin and early evolution of the Osteostraci (Vertebrata): A ...
2010年3月9日 · The Osteostraci are currently regarded as the sister taxon to jawed vertebrates and, as such, osteostracan phylogeny, notably their hypothetical ancestral morphotype, has far reaching ramifications for early vertebrate evolution.
(PDF) Osteostraci - ResearchGate
1996年1月1日 · The Osteostraci are a morphologically diverse group of jawless fishes considered as sister taxon to jawed vertebrates.