Product Code Database
Ptycholepiformes are an extinct order of prehistoric Actinopterygii that existed during the Triassic period and the Early Jurassic epoch. The order includes the genera Acrorhabdus, Ardoreosomus, Boreosomus, Chungkingichthys, Ptycholepis, and Yuchoulepis. Although several families have been proposed, some studies place all these genera in the same family, Ptycholepididae.
Ptycholepiformes had a widespread distribution during the Early Triassic, but were restricted to mainly Europe and North America afterwards. They are known from both Ocean and freshwater deposits.
The scales are typically equipped with distinct longitudinal ridges. In Ptycholepis, the scales are low, whereas in genera, such as Ardoreosomus and Boreosomus, the scales are deeper. Peg-and-socket articulation between scales is present.
Species reached body sizes between and .
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align:center textcolor:black fontsize:M mark:(line,black) width:25
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bar:periodtop
from: -251.902 till: -247.2 color:earlytriassic text:[[Early|Early Triassic]]
from: -247.2 till: -237 color:middletriassic text:[[Middle|Middle Triassic]]
from: -237 till: -201.3 color:latetriassic text:[[Late|Late Triassic]]
from: -201.3 till: -174.1 color:earlyjurassic text:[[Early|Early Jurassic]]
from: -174.1 till: -163.5 color:middlejurassic text:[[Middle|Middle Jurassic]]
from: -163.5 till: -145.0 color:latejurassic text:[[Late|Late Jurassic]]
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from: -251.902 till: -201.3 color:triassic text:[[Triassic]]
from: -201.3 till: -145.0 color:jurassic text:[[Jurassic]]
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color:earlytriassic bar:NAM1 from:-251.902 till:-251.2 text:[[Ardoreosomus]]
color:earlytriassic bar:NAM2 from:-251.2 till:-250 text:[[Acrorhabdus]]
color:earlytriassic bar:NAM3 from:-251.902 till:-247.2 text:[[Boreosomus]]
color:earlytriassic bar:NAM4 from:-251.902 till:-247.2 text:[[Chungkingichthys]]
color:middletriassic bar:NAM5 from:-243 till:-180.53 text:[[Ptycholepis]]
color:earlytriassic bar:NAM6 from:-251.902 till:-247.2 text:[[Yuchoulepis]]
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from: -251.902 till: -247.2 color:earlytriassic text:[[Early|Early Triassic]]
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from: -163.5 till: -145.0 color:latejurassic text:[[Late|Late Jurassic]]
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from: -251.902 till: -201.3 color:triassic text:[[Triassic]]
from: -201.3 till: -145.0 color:jurassic text:[[Jurassic]]
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