Indosinosuchus fossil map
Where fossils of Indosinosuchus have been found, shown on the Earth as it looked about 145 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 145 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Crocodile relatives |
|---|---|
| Lived | 168.2–137.05 million years ago (Bathonian to Berriasian) |
| Periods | Jurassic, Cretaceous |
| Family | Teleosauridae |
| Named by | Martin et al. 2018 |
| Fossil records | 3 occurrences at 2 locations (PBDB) |
| Found in | Thailand |
| Rock formations | Phu Kradung, Khlong Min |
About Indosinosuchus
Indosinosuchus is a genus of teleosaurid crocodyliform that lived during the Late Jurassic or Early Cretaceous in what is now Thailand. There are at least two recognized species, the type species I. potamosiamensis from the lower Phu Kradung Formation and I. peninsularensis from the Khlong Min Formation. A third species has also previously been proposed based on a single skull from the Phu Kradung Formation, initially named Indosinosuchus kalasinensis, but a 2026 study has argued that this taxon was synonymous with Indosinosuchus potamosiamensis. It is unique among teleosauroids as the type species is the only named genus known from a freshwater environment, while most other members including I. peninsularensis are marine. Indosinosuchus is placed in the family Teleosauridae, but has a relatively robust skull that bears resemblance to members of the Machimosauridae. Biomechanical analysis of its mandible and teeth suggest that it would have had a substantial bite force comparable to animals like Lemmysuchus. Most known specimens of this genus were recovered from a single locality, which has been interpreted as a mass death site, possibly caused by a drought or flash flood. The precise age of Indosinosuchus is unclear, as the vertebrate fossils of the Phu Kradung Formation support a Late Jurassic age, while palynological data suggests an Early Cretaceous (Berriasian) age. The oldest remains from southern Thailand on the other hand suggest that the genus first appeared during the late Middle or early Late Jurassic.
Text in “About” is quoted from the Wikipedia article Indosinosuchus (revision 1380714902), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q63951900.
