Loganelliidae is an extinct family of
thelodont
Thelodonti (from Greek: "feeble teeth")Maisey, John G., Craig Chesek, and David Miller. Discovering fossil fishes. New York: Holt, 1996. is a class (biology), class of extinct jawless fishes with distinctive Fish scale, scales instead of large pl ...
s in the order
Thelodontiformes
Thelodontiformes is an extinct order of jawless fish of the Silurian.Kiaer, J., 1932: New coelolepids from the Upper Silurian on Oesel (Esthonia). Eesti Loodusteaduse Arhiiv, Seeria 1, 10: 167-176.
Because the paucity of intact fossils, especial ...
.
They are distinguished by the star or cross shaped ridges located on their head scales.
Morphology
The head scales possess cross shaped or star shaped ridges, transitional scales are rhomboidal, and trunk scales are horizontally elongated. The crown is notably posteriorly pointed, with the apex extending beyond the base. The main crown surface is flat and smooth, and can be inclined in either horizontal direction. The base of the crown possesses a short spine which points downwards and anteriorly.
Classification
The family contains the following genera:
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Angaralepis''
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Illoganellia''
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Larolepis''
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Loganellia
''Loganellia'' is a genus of jawless fish which lived between 430 and 370 million years ago, during the Silurian and Devonian periods of the Paleozoic. ''Loganellia'' belonged to the Thelodonti class and like other Thelodonts possessed scales ins ...
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Nunavutia''
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Sandivia''
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Stroinolepis
''Stroinolepis'' is an extinct genus of thelodontid that lived during the Middle Ordovician period in what is now the Severnaya Zemlya archipelago of Russia
Russia (, , ), or the Russian Federation, is a List of transcontinental countri ...
''
* ''
Talimaalepis''
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Valyalepis''
References
Thelodonti
Prehistoric jawless fish families
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