PaleoDB taxon number: 172984
Alternative combination: Crocodilus prenasalis
Synonyms: Alligator riggsi Patterson 1931 (no. 172982), Alligator vischeri Mehl 1916 (no. 172981), Allognathosuchus riggsi Patterson 1931 (no. 132878), Caimanoidea visheri Mehl 1916 (no. 96547)
Full reference: F. B. Loomis. 1904. Two new river reptiles from the Titanothere beds. American Journal of Science 18:427-432
Sister taxa: Alligator darwini, Alligator gaudryi, Alligator hantoniensis, Alligator heterodon, Alligator luicus, Alligator mcgrewi, Alligator mefferdi, Alligator mississippiensis, Alligator olseni, Alligator sinensis, Alligator thomsoni
- Alligator prenasalis: Its type locality is Indian Draw (SDSM Titanothere Beds), which is in a Chadronian fluvial-lacustrine siliciclastic in the Chadron Formation of South Dakota
- Allognathosuchus riggsi: Field Museum P 12141, a mandible (left mandible). Its type locality is Phinney Springs, which is in a Chadronian fluvial-lacustrine siliciclastic in the Chadron Formation of South Dakota.
- Caimanoidea visheri: University of South Dakota 1,044, a partial skeleton (goodly portion of a skull, a nearly complete mandible, two femora and other limb bones, a nearly complete series of vertebrae, many dorsal scutes, and numerous ). Its type locality is Caimanoidea visheri type locality, which is in a Chadronian fluvial-lacustrine siliciclastic in the Chadron Formation of South Dakota.
Average measurements (in mm): skull 243.5 x 100.0
Estimated body mass: 17.4 kg based on skull length