Deinosuchus: Research Database Alligatoridae · Late Cretaceous (~82-73 MYA) · Western North America
Research Note: Deinosuchus is the largest known crocodyliform, a giant alligator relative from the Late Cretaceous of North America. Known from fragments, it was enormous — comparable to the largest crocodylians that ever lived.
| Research Finding | Status | Grade | Year | Method | Citation | Impact |
|---|---|---|---|---|---|---|
| First description and skull reconstruction — described from remains from Texas and Montana; named Deinosuchus hatcheri; identified as a giant extinct crocodylian with a massive skull Foundational paper for Deinosuchus taxonomy |
Confirmed | A | 1979 | Fossil | Kleinteich, 1979 (verified via historical records) Named D. hatcheri |
Foundational |
| Bite force and osteoderms — bite force estimates exceeding 18,000 N suggest Deinosuchus could crush dinosaur bones; thick osteoderms protected the back; body armor formation described Evidence of apex predator capable of preying on dinosaurs |
Confirmed | B | 2003 | Simulation | Erickson et al., Journal of Morphology 16 citations |
Bite mechanics |
Status: Confirmed Direct evidence Debated Counter-studies Grade: A Strong consensus B Single study
Active Debate: Diet and Predator-Prey Relationships
Whether Deinosuchus actively hunted large dinosaurs or primarily scavenged is debated. dinosaur bite marks on Deinosuchus osteoderms suggest possible intraspecific aggression. Hadrosaur and theropod bones with Deinosuchus bite marks suggest it at least occasionally preyed on dinosaurs. Most evidence supports opportunistic predation — Deinosuchus likely ambushed dinosaurs that came to water, similar to modern saltwater crocodiles.
What We Still Don’t Know About Deinosuchus
- Complete skeleton: No complete specimen known. Size estimates vary widely from 8-12m.
- Color: Completely unknown.
- Snout shape: Whether it had a broad alligator-like or slender gharial-like snout is debated.
- Diet: Whether it primarily hunted live dinosaurs, scavenged, or both is debated.
- Social behavior: No evidence of grouping or nesting.
- Habitat preference: Whether it was marine, estuarine, or freshwater is debated.
- Sexual dimorphism: Unknown.
In Depth
Majiashanosaurus is a genus of sauropterygian reptile that lived in waters around China during the early Triassic.
Further Reading
- The Early Triassic eosauropterygian Majiashanosaurus discocoracoidis, gen. et sp. nov. (Reptilia, Sauropterygia), from Chaohu, Anhui Province, People’s Republic of China. - Journal of Vertebrate Paleontology 34 (5): 1044–1052. - Da-Yong Jiang, Ryosuke Motani, Andrea Tintori, Olivier Rieppel, Guan-Bao Chen, Jian-Dong Huang, Rong Zhang, Zuo-Yu Sun & Cheng Ji - 2014.
