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Thelodonti is a class of extinct Palaeozoic jawless fishes with distinctive scales instead of large plates of armor.
Anaspida is an extinct group of evolutionarily underived jawless vertebrates that existed from the early Silurian period to the late Devonian period. They were classically regarded as the ancestors of lampreys. Anaspids were small marine agnathans that lacked a heavy bony shield and paired fins, but were distinctively hypocercal.
Dartmuthia is an extinct genus of primitive jawless fish that lived in the Silurian period. Fossils of Dartmuthia have been found in Himmiste Quarry, on the island of Saaremaa in Estonia. It was first described by William Patten.
Jamoytius kerwoodi is an extinct species of primitive, eel-like jawless fish that lived in the Llandovery epoch of the Early Silurian period.
Birkenia is a genus of extinct anaspid fish from Middle Silurian strata of Northern Europe, and Middle Silurian to possibly Earliest Devonian strata of Arctic Canada. Birkeniid anaspids are covered by a series of small plates on the head and rod-shaped scales in a cheveron-like pattern on the trunk.
Andreolepis is an extinct genus of prehistoric fish, which lived around 420 million years ago. It was described by Walter Gross in 1968 based on scales found in the Hemse Formation in Gotland, Sweden. It is placed in the monogeneric family Andreolepididae and is generally regarded as a primitive member of the class Actinopterygii based on its ganoid scale structure; however some new research regards it as a stem group of osteichthyans.
Euthynotus is an extinct genus of prehistoric bony fish that lived during the early Toarcian stage of the Early Jurassic epoch. It is generally considered the basalmost pachycormiform.
Longodus is an extinct genus of thelodont, placed in its own family – Longodidae – which existed in what is now Estonia during the Ludlow epoch of the upper Silurian period. The type and only species is Longodus acicularis. They are most noted for their long, needle-like scales, which run vertically along their trunk.
The Sundvollen Formation is a geologic formation cropping out along the northern and eastern shores of Steinsfjorden, Oslo Region, Norway. It preserves fossils dating back to the Gorstian to Ludfordian stages of the Late Silurian period.
Furcacaudiformes is an extinct order of jawless fish in the class Thelodonti.
Thelodontiformes is an extinct order of jawless fish of the Silurian.
Archipelepidiformes is an order of extinct jawless fishes in the class Thelodonti.
Archipelepis is a genus of extinct thelodont agnathans, and are the most primitive recognized thelodonts of which whole body fossils are known. Fossils of bodies and scales are currently known from Late Telychian to Wenlock-aged marine strata of northern Canada.
Birkeniiformes is an extinct order of jawless fish belonging to the class Anaspida.
Septentrioniidae is an extinct family of jawless fish belonging to the order Birkeniiformes.
Septentrionia is an extinct genus of jawless fish belonging to the family Septentrioniidae. It is the type genus of its family.
Liivilepis is an extinct genus of jawless fish belonging to the family Septentrioniidae.
Anaspidomorphi (anaspidomorphs) is an extinct superclass of jawless fish.
Loganelliidae is an extinct family of thelodonts in the order Thelodontiformes. They are distinguished by the star or cross shaped ridges located on their head scales.
Ramsaasalepis is an extinct genus of jawless fish. Its the type and only genus of the family Ramsaasalepididae, and contains the single species Ramsaasalepis porosa.
References
- ↑ Henning Blom; Tiiu Märss; C. C. Giles Miller (2002). "Silurian and earliest Devonian birkeniid anaspids from the Northern Hemisphere". Transactions of the Royal Society of Edinburgh: Earth Sciences. 92 (3–4): 263–323. doi:10.1017/S0263593300000250. S2CID 129181308.
- ↑ Henning Blom; Tiiu Märss; C. C. Giles Miller (2002). "Birkeniid anaspids from the northern hemisphere". 92: 263–323.
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