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Armored jawless fish of the Paleozoic
Ostracodermi (lit. 'shell-skins') or ostracoderms is an informal group of vertebrate animals that include all armored jawless fish of the Paleozoic Era
Ostracoderm
Origin and diversification of fish through geologic time
jawless fish called the conodonts, and small mostly armoured fish known as ostracoderms, first appeared. Most jawless fish are now extinct; but the extant lampreys
Evolution_of_fish
Third period of the Paleozoic Era
corresponded to sharp decline of jawless fish such as conodonts and ostracoderms. The Silurian system was first identified by the Scottish geologist Roderick
Silurian
Gill-bearing non-tetrapod aquatic vertebrates
earliest fish with dedicated respiratory gills and paired fins, the ostracoderms, had heavy bony plates that served as protective exoskeletons against
Fish
Extinct class of jawless fishes
vertebrates or, at any rate, for the ensemble of all ostracoderms and the gnathostomes. Other ostracoderms, such as the Galeaspida are now known to have a
Pteraspidomorpha
Extinct genus of jawless fishes
genus of primitive ostracoderm fish that lived in the Silurian period (Wenlock Epoch) to the Lower Devonian. Like other ostracoderms, Ateleaspis had a
Ateleaspis
Extinct subclass of jawless fishes
shell" [-i is pl. of -us]) is an extinct subclass of pteraspidomorph, ostracoderm, jawless vertebrate that lived primarily in marine and estuary environments
Heterostraci
Diverse clade of vertebrate animals
sunfish, giant grouper and all the other giant bony fishes alive today. Ostracoderm - armoured jawless fish. Entelognathus Bianchengichthys Prehistoric fish
Osteichthyes
Second period of the Paleozoic Era
appeared. It was long thought that the first true vertebrates (fish — Ostracoderms) appeared in the Ordovician, but recent discoveries in China reveal that
Ordovician
Paraphyletic infraphylum of fish
armored with heavy bony-spiky plates. The first armored agnathans—the ostracoderms, precursors to the bony fish and hence to the tetrapods (including humans)—are
Agnatha
System that relates geologic strata to time
eurypterid arthropods. Earliest jawed fish (acanthodians). Appearance of ostracoderms. Appearance of vascular plants. First land animals including myriapods
Geologic_time_scale
Extinct genus of jawless fishes
University of Leicester. White, Errol Ivor (22 October 1935). "The Ostracoderm Pteraspis Kner and the relationships of the agnathous vertebrates". Philosophical
Pteraspis
Hard skeletal covering of fish
the species of fish it came from. Scales originated within the jawless ostracoderms, ancestors to all jawed fishes today. Most bony fishes are covered with
Fish_scale
Extinct paraphyletic class of fishes
those days, placoderms were thought to be shelled jawless fish akin to ostracoderms. Some naturalists even suggested that they were shelled invertebrates
Placoderm
American zoologist
University of North Dakota and Dartmouth College noted for work on fossil ostracoderms, ideas on the origin of vertebrates from arachnids and his 1919 address
William_Patten_(zoologist)
Study of past life through fossils
vertebrates has been used to classify them and separate jawless vertebrates (ostracoderms) from those with jaws such as placoderms and acanthodians. Similarly
Paleontology
Entomostraca, Leptostraca, Malacostraca, ostracism, ostracize, ostracod, ostracoderm, ostracon, periostracum ostre- oyster Greek ὄστρεον ostreophagist, oyster
List of Greek and Latin roots in English/H–O
List_of_Greek_and_Latin_roots_in_English/H–O
Extinct family of jawless fishes
Textbook of Zoology Vertebrates pp 164–202 Woodward AS (1900). "On a new Ostracoderm (Euphanerops longaevus) from the Upper Devonian of Scaumenac Bay, Province
Euphaneropidae
Cartilaginous fish in the order Chimaeriformes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Chimaera
Flexible rod-shaped structure in all chordates
bony elements or without, most notably the conodonts, placoderms, and ostracoderms. Even after the evolution of the vertebral column in chondrichthyes and
Notochord
Class of ray-finned bony fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Actinopterygii
Subclass of fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Elasmobranchii
Sacabambaspis an armoured jawless fish (ostracoderm) known from the Ordovician
Timeline_of_human_evolution
Extinct genus of jawless fishes
known as "agnathans" while extinct armored jawless fish are called "ostracoderms". These terms are purely categorical, paleontologists no longer use them
Sacabambaspis
Fourth period of the Paleozoic Era
parts of the water column. Among vertebrates, jawless armored fish (ostracoderms) declined in diversity, while the jawed fish (gnathostomes) simultaneously
Devonian
Class of lobe-finned fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Coelacanth
Division or infraclass of fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Teleost
Extinct order of cartilaginous fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Ischnacanthiformes
Clade of lobe-finned fish
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Sarcopterygii
Species of fish
9 cm (4.3 in). The specific name, cephalaspis, is the name of a fossil ostracoderm which the describer, Isbrücker, stated this species bore a "striking
Crossoloricaria_cephalaspis
Canadian geologist
graptolites and of the extinct, primitive jawless fishes referred to as ostracoderm that lived some 400 million years ago. In 1955 and 1956, he was a visiting
Raymond_Thorsteinsson
Extinct order of jawless fishes
Fish Ørvig, T. 1958. Pycnaspis splendens, new genus, new species, a new ostracoderm from the Upper Ordovician of North America. Proceedings of the United
Eriptychiida
Fourth and current eon of the geological timescale
features a huge diversification in fish such as the jawless conodonts and ostracoderms, as well as jawed fish such as the armored placoderms (e.g. Dunkleosteus)
Phanerozoic
Extinct class of jawless fishes
"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
Osteostraci
Infraphylum of vertebrates
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Gnathostomata
Extinct genus of jawless fishes
Eastern Europe. It is notable for its large size in comparison to other Ostracoderms, reaching a width of 1.5 m (4.9 ft). Like other Psammosteid Heterostracans
Tartuosteus
Extinct genus of jawless vertebrates
A. (1968). "New evidence on Jamoytius kerwoodi White, an important ostracoderm from the Silurian of Lanarkshire, Scotland" (PDF). Palaeontology. 11:
Jamoytius
Part of the epithalamus
normal vertebrate eye. Many of the oldest fossil vertebrates, including ostracoderms, placoderms, crossopterygians, and early tetrapods, have in their skulls
Parietal_eye
Paleontological research in the U.S. state of South Dakota
come to be home to creatures like brachiopods, cephalopods, corals, and ostracoderms. Local sea levels rose and fall during the Carboniferous and the sea
Paleontology_in_South_Dakota
Group of extinct jawless vertebrates
paired fins, but were distinctively hypocercal. Compared to many other ostracoderms, such as the Heterostraci and Osteostraci, anaspids did not possess a
Anaspida
Extinct agnathan chordates resembling eels
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Conodont
Clade of vertebrates
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Rhipidistia
Extinct order of jawless fishes
Palaeontologia Polonica 15: 168. Pages 20-21 TARRANT, P. (1991). "The ostracoderm Phialaspis from the Lower Devonian of the Welsh Borderland and South
Traquairaspidiformes
Extinct order of jawless fishes
Ørvig, T. (1958). Pycnaspis splendens new genus, new species, a new ostracoderm from the Upper Ordovician of North America. Proceedings of the United
Astraspida
Paleontological research in the U.S. state of New York
included small arthrodires, chimaeroids, crossopterygians, lungfishes, and ostracoderms. Central and southern New York were home to a westward-flowing river
Paleontology_in_New_York
Extinct genus of jawless fishes
S2CID 131496210. Retrieved 28 December 2021. Robertson, G. M. (1935). "The ostracoderm genus Dartmuthia Patten". American Journal of Science. Series 5. 29 (172):
Dartmuthia
Extinct order of cartilaginous fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Petalodontiformes
Railway tunnel in Herefordshire, England
findings included significant numbers of fossilised fish, acanthodians and ostracoderms, some complete with the body and tail. The completed tunnel was opened
Ledbury_Tunnel
(invertebrate lancelets) Vertebrates such as hagfishes, lampreys, conodonts [†], ostracoderms [†], placoderms [†], sharks, ray-finned fishes, lobe-finned fishes, amphibians
Taxonomy of commonly fossilised invertebrates
Taxonomy_of_commonly_fossilised_invertebrates
Extinct order of fishes
rhenanids, while the other suggests that they were actually some sort of ostracoderm agnathans. Denison, Robert (1978). Handbook of Paleoichthyology, Volume
Rhenanida
Family of fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Snailfish
Subphylum of chordates
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Lancelet
Subclass of fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Chondrostei
Superclass of jawless fishes
which also includes several groups of extinct armored fishes called ostracoderms. Most fossil agnathans, such as galeaspids, thelodonts, and osteostracans
Cyclostomi
Cambrian fossil chordate
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Yunnanozoon
Class of jawed cartilaginous fish
with heavy armor plating. Historically misinterpreted as placoderms or ostracoderms. †Cochliodontiformes Cochliodonts Obruchev, 1953 2 Members of Holocephali
Chondrichthyes
Paleontological research in the U.S. state of Colorado
that would come to be home to creatures like brachiopods, conodonts, ostracoderms, sharks and trilobites. This sea withdrew from the state between the
Paleontology_in_Colorado
Extinct genus of jawless fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Haikouichthys
Group of cartilaginous fish
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Holocephali
Extinct genus of primitive chordates
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Pikaia
Extinct group of elasmobranchs
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Phoebodontiformes
Small rigid plate that grows out of an animal's skin
and two lateral spines. The modern jawed fish ancestors, the jawless ostracoderms and later jawed placoderms, may have had scales with the properties of
Scale_(zoology)
Extinct order of cartilaginous fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Xenacanthiformes
Extinct order of chondrichthyans
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Hybodontiformes
Evolution of fish
were still fairly common. Among vertebrates, jawless armoured fish (ostracoderms) declined in diversity, while the jawed fish (gnathostomes) simultaneously
Timeline_of_fish_evolution
Genus of jawless fishes
back, it lacks the armour typical of other Paleozoic jawless fish like ostracoderms. There are also structures close to the front of the animal dubbed "chains"
Lasanius
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Lists_of_prehistoric_fish
Subclass of fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Neopterygii
Extinct genus of jawless fish
Svenska Vetenskaps-Akademiens Handlingar. White, Errol Ivor (1935). "The Ostracoderm Pteraspis Kner and the Relationships of the Agnathous Vertebrates". Philosophical
Doryaspis
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
List_of_placoderm_genera
Index of articles associated with the same name
fish (including skull, thoracic and tooth plates) bony shields of the Ostracoderms (armored jawless fishes) such as the dermal head armour of members of
Plate_(anatomy)
Extinct class of jawless fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Thelodonti
Second epoch of the Devonian period
and Givetian. In the middle Devonian the armored jawless fish known as ostracoderms were declining in diversity and instead the jawed fish were thriving
Middle_Devonian
Class of chordates
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Galeaspida
Extinct order of cartilaginous fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Ctenacanthiformes
Extinct genus of chordates
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Cathaymyrus
Extinct order of fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Pycnodontiformes
Extinct genus of chordates
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Zhongxiniscus
Clade of ray-finned fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Cladistia
Extinct genus of jawless fishes
Paraliliaspis. Watson, David Meredith Seares (1954-10-28). "A Consideration of Ostracoderms". Phil. Trans. R. Soc. Lond. B. 238 (652): 1–25. doi:10.1098/rstb.1954
Anglaspis
Extinct genus of Pteraspidomorph fish
trunk and tail is unknown. According to comparisons with other early ostracoderms, it would have lacked paired fins and the caudal fin would be of a simple
Arandaspis
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
List of prehistoric cartilaginous fish genera
List_of_prehistoric_cartilaginous_fish_genera
Genus of Conodont
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Promissum
Extinct order of fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Acanthodiformes
Devonian fossil locality in Canada
of Canada Memoirs. 366: 1–268. Dineley, D.L.; Loeffler, E.J. (1976). "Ostracoderm faunas of the Delorme and associated Siluro-Devonian formations North
MOTH_locality
Extinct genus of jawless fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Drepanaspis
orthoconic nautiloids, ostracods, trilobites, phacopids), crinoids, ostracoderm and acanthodian fish. Jennycliff Bay has steeply inclined folds, which
Plymouth Sound, Shores and Cliffs
Plymouth_Sound,_Shores_and_Cliffs
Extinct order of cartilaginous fish
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Iniopterygiformes
Extinct paraphyletic class of fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Acanthodii
are 250 meters thick including siltstone, shale, sandstone, clay and ostracoderm fossils. Middle Devonian rocks have a shift toward argillite and gypsum
Geology_of_Latvia
Element of fish anatomy
vertebrates are the long extinct bony (armoured) jawless fish, the so-called ostracoderms. The earliest known fish with jaws are the now extinct placoderms and
Fish_jaw
Extinct family of eurypterids
race" with early vertebrates, that the evolution of heavy armor in the ostracoderms could be attributed to pressure from pterygotid predation and that later
Pterygotidae
Extinct order of cartilaginous fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Symmoriiformes
Ferrón, H. G. (2025). "Functional aspects of the headshield processes in ostracoderms". Paleobiology. 51 (2): 310–322. Bibcode:2025Pbio...51..310S. doi:10
2025_in_paleoichthyology
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
List_of_acanthodian_genera
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
List of prehistoric bony fish genera
List_of_prehistoric_bony_fish_genera
Study of ancient life in Wyoming, US
Paleozoic era and would come to be inhabited by creatures like brachiopods, ostracoderms, and trilobites. During the Silurian, the sea withdrew from Wyoming and
Paleontology_in_Wyoming
again. During the Middle Ordovician, early armored jawless fish called ostracoderms left behind fragmentary shards of bone in what is now the Rocky Mountains
Geological history of North America
Geological_history_of_North_America
Extinct group of cartilaginous fishes
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Eugeneodontiformes
Extinct order of chordates
Hyperoartia Lamprey †Conodonts †Protoconodonta? †Paraconodontida †Conodonta †Ostracoderms †Pteraspidomorphi †Thelodonti †Anaspida †Cephalaspidomorphi †Galeaspida
Paraconodontida
OSTRACODERM
OSTRACODERM
OSTRACODERM
OSTRACODERM
Girl/Female
British, English, French, German, Latin, Teutonic
Female Version of Elvin; Noble Friend; White
Boy/Male
Tamil
Lord venkateswara
Male
Russian
(Сергей) Russian form of Greek Sergios, possibly SERGEI means "sergeant."Â
Girl/Female
Tamil
Desired
Boy/Male
Muslim/Islamic
Respect honor
Boy/Male
Hindu
Love, Avatar
Girl/Female
Australian, Gaelic
Slender; From the Forest; Similar to Caley or Cailley
Boy/Male
Tamil
Thesun, Lord of Sun, Newly risen Sun, Lord Surya, The Sun
Boy/Male
Indian
Ardent, Longing, Chosen
Girl/Female
Tamil
Ashwathy | à®…à®·à¯à®µà®¤à¯à®¯
An Angel
OSTRACODERM
OSTRACODERM
OSTRACODERM
OSTRACODERM
OSTRACODERM
n. pl.
A suborder of fishes of which Ostracion is the type.