Tarasiiformes is an
extinct order of
prehistoric ray-finned fish
Actinopterygii (; ), members of which are known as ray-finned fishes, is a class of bony fish. They comprise over 50% of living vertebrate species.
The ray-finned fishes are so called because their fins are webs of skin supported by bony or h ...
.
Taxonomy
* Order †Tarrasiiformes
sensu Lund & Poplin 2002 aplistiaref name="mikko">
** Family †Tarrasiidae
Traquair 1881 emend. Woodward 1891
*** Genus †''
Apholidotos''
Lund ex Frickinger 1991 nomen novum
**** Species †''
Apholidotos ossna''
Lund ex Frickinger 1991 nomen novum
*** Genus †''
Paratarrasius''
Lund & Melton 1982
**** Species †''
Paratarrasius hibbardi''
Lund & Melton 1982
*** Genus †''
Tarrasius''
Traquair 1881
**** Species †''
Tarrasius problematicus''
Traquair 1881
Timeline of genera
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from: -416 till: -411.2 color:earlydevonian text: Loch.
from: -411.2 till: -407 color:earlydevonian text: Prag.
from: -407 till: -397.5 color:earlydevonian text: Ems.
from: -397.5 till: -391.8 color:middledevonian text: Eif.
from: -391.8 till: -385.3 color:middledevonian text:Givetian
The Givetian is one of two faunal stages in the Middle Devonian Period. It lasted from million years ago to million years ago. It was preceded by the Eifelian Stage and followed by the Frasnian
The Frasnian is one of two faunal stages in the ...
from: -385.3 till: -374.5 color:latedevonian text:Frasnian
The Frasnian is one of two faunal stages in the Late Devonian Period. It lasted from million years ago to million years ago. It was preceded by the Givetian Stage and followed by the Famennian Stage.
Major reef-building was under way during th ...
from: -374.5 till: -359.2 color:latedevonian text:Famennian
The Famennian is the latter of two faunal stages in the Late Devonian Epoch. The most recent estimate for its duration estimates that it lasted from around 371.1 million years ago to 359.3 million years ago. An earlier 2012 estimate, still used b ...
from: -359.2 till: -345.3 color:mississippian text:Tournaisian
The Tournaisian is in the ICS geologic timescale
The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy ...
from: -345.3 till: -328.3 color:mississippian text:Viséan
The Visean, Viséan or Visian is an age in the ICS geologic timescale or a stage in the stratigraphic column. It is the second stage of the Mississippian, the lower subsystem of the Carboniferous. The Visean lasted from to Ma. It follow ...
from: -328.3 till: -318.1 color:mississippian text: Serpukhov.
from: -318.1 till: -311.7 color:pennsylvanian text: Bashkir.
from: -311.7 till: -306.5 color:pennsylvanian text: Mosc.
from: -306.5 till: -303.9 color:pennsylvanian text: K.
from: -303.9 till: -299 color:pennsylvanian text: Gzh.
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from: -416 till: -359.2 color:devonian text: Devonian
from: -359.2 till: -299 color:carboniferous text: Carboniferous
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color:mississippian bar:NAM2 from:-345.3 till:-328.3 text: Tarrasius
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from: -411.2 till: -407 color:earlydevonian text: Prag.
from: -407 till: -397.5 color:earlydevonian text: Ems.
from: -397.5 till: -391.8 color:middledevonian text: Eif.
from: -391.8 till: -385.3 color:middledevonian text:Givetian
The Givetian is one of two faunal stages in the Middle Devonian Period. It lasted from million years ago to million years ago. It was preceded by the Eifelian Stage and followed by the Frasnian
The Frasnian is one of two faunal stages in the ...
from: -385.3 till: -374.5 color:latedevonian text:Frasnian
The Frasnian is one of two faunal stages in the Late Devonian Period. It lasted from million years ago to million years ago. It was preceded by the Givetian Stage and followed by the Famennian Stage.
Major reef-building was under way during th ...
from: -374.5 till: -359.2 color:latedevonian text:Famennian
The Famennian is the latter of two faunal stages in the Late Devonian Epoch. The most recent estimate for its duration estimates that it lasted from around 371.1 million years ago to 359.3 million years ago. An earlier 2012 estimate, still used b ...
from: -359.2 till: -345.3 color:mississippian text:Tournaisian
The Tournaisian is in the ICS geologic timescale
The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy ...
from: -345.3 till: -328.3 color:mississippian text:Viséan
The Visean, Viséan or Visian is an age in the ICS geologic timescale or a stage in the stratigraphic column. It is the second stage of the Mississippian, the lower subsystem of the Carboniferous. The Visean lasted from to Ma. It follow ...
from: -328.3 till: -318.1 color:mississippian text: Serpukhov.
from: -318.1 till: -311.7 color:pennsylvanian text: Bashkir.
from: -311.7 till: -306.5 color:pennsylvanian text: Mosc.
from: -306.5 till: -303.9 color:pennsylvanian text: K.
from: -303.9 till: -299 color:pennsylvanian text: Gzh.
bar:era
from: -416 till: -359.2 color:devonian text: Devonian
from: -359.2 till: -299 color:carboniferous text: Carboniferous
''Tarrasius'' is an extinct genus of Tarasiiformes. ''Tarrasius problematicus'' (of
Mississippian origin, ~ 350
Ma) featured a fully regionalized
tetrapod
Tetrapods (; ) are four-limbed vertebrate animals constituting the superclass Tetrapoda (). It includes extant and extinct amphibians, sauropsids ( reptiles, including dinosaurs and therefore birds) and synapsids ( pelycosaurs, extinct t ...
-like spine divided into 5 distinct segments.
It is not considered a
transitional fossil
A transitional fossil is any fossilized remains of a life form that exhibits traits common to both an ancestral group and its derived descendant group. This is especially important where the descendant group is sharply differentiated by gross a ...
though, but an extreme example of
convergent evolution
Convergent evolution is the independent evolution of similar features in species of different periods or epochs in time. Convergent evolution creates analogous structures that have similar form or function but were not present in the last com ...
.
See also
*
Prehistoric fish
The evolution of fish began about 530 million years ago during the Cambrian explosion. It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates. The first fis ...
*
List of prehistoric bony fish
*
Convergent evolution
Convergent evolution is the independent evolution of similar features in species of different periods or epochs in time. Convergent evolution creates analogous structures that have similar form or function but were not present in the last com ...
Bibliography
*
References
External links
Bony fish in the online Sepkoski Database
{{Taxonbar, from=Q7686676
Carboniferous bony fish
Prehistoric ray-finned fish orders