Isanichthys
Extinct genus of fish
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Isanichthys is an extinct genus of Lepidotid Ginglymodian fish. The fossils were found in the Phu Kradung Formation. Isanichthys lived in the Late Jurassic Northeastern Thailand.
| Isanichthys Temporal range: | |
|---|---|
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| Fossil of Isanichthys lertboosi | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Clade: | Ginglymodi |
| Order: | Lepisosteiformes |
| Family: | †Lepidotidae |
| Genus: | †Isanichthys Cavin & Suteethorn, 2006[1] |
| Type species | |
| Isanichthys palustris Cavin & Suteethorn, 2006 | |
| Other species | |
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Classification
Isanichthys is a Lepidotid closely related to Scheenstia, Camerichthys, Lepidotes, and Mengius.
Below is the cladogram of Lepidotidae based on a Cladistic analysis constructed by Detlev, Kevin and Jörg in 2024.[3]
| Lepidotidae |
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Species
I. lertboosi
I. lertboosi is represented by four specimens, all from the Phu Noi Locality. One specimen is an isolated braincase , rarely found in extinct ginglymodians. Characterized by a dermal component of the sphenotic visible by the cheek, One pair of extraspaculars and a small median one.[2]
I. palustris
I. palustris is described from a singular almost-complete specimen. From Late jurassic-Early Cretaceous from Phu Kradung Formation, Also found alongside Lepidotes fossils in Phu Nam Jun Locality. I. palustris shows a mixture of Semionotiformes and lepisosteid-like characteristics, such as the cheek ossification patterns, body shape and dorsal fin.[1]