Isanichthys palustris Cavin and Suteethorn, 2006

Deesri, Uthumporn, Lauprasert, Komsorn, Suteethorn, Varavudh, Wongko, Kamonlak & Cavin, Lionel, 2014, A new species of the ginglymodian fish Isanichthys from the Late Jurassic Phu Kradung Formation, northeastern Thailand, Acta Palaeontologica Polonica 59 (2), pp. 313-331 : 326

Isanichthys palustris Cavin and Suteethorn, 2006

Holotype: TF 7764, a nearly complete individual, only known specimen.

Type locality: Phu Nam Jun, Thailand.

Type horizon: Upper part of the Phu Kradung Formation, probably Berriasian.

Emended diagnosis.— Isanichthys with the body elongated and slender, with the total legnth 5.5 times the estimated maximum depth, and 4.5 times the head length (including the opercular series); 8–9 suborbitals arranged in a mosaic pattern; no dermal component of the sphenotic; infraorbital and suborbital bones strongly ornamented; median dorsal row of scales without posterior spine; two pairs of extrascapulars; toothed maxilla; dentary bearing approximately 12 small cylindrical teeth.

Remarks.— Isanichthys palustris Cavin and Suteethorn, 2006 was identified on the basis of a single specimen from the Phu Nam Jun locality, Thailand. Although from the same formation, i.e., the Phu Kradung Formation, the Phu Nam Jun locality is stratigraphically higher in the formation, close to its top, and consequently the fish assemblage of this locality is likely younger than the assemblage from the Phu Noi locality. The description of I. lertboosi led to a re-examination of the specific characters of the type species.