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Temporal range: Eocene
Hassiacosuchus haupti 01.jpg
Fossil, Staatliches Museum für Naturkunde Karlsruhe
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Crocodilia
Family: Alligatoridae
Subfamily: Alligatorinae
Genus: Hassiacosuchus
Weitzel, 1935
Type species
Hassiacosuchus haupti
Weitzel, 1935

Hassiacosuchus is an extinct genus of small alligatorid from the early Eocene of Germany, found at the Messel pit. It was named in 1935 by K. Weitzel, and the type species is H. haupti.[1] A second species, H. kayi, was named in 1941 by C.C. Mook for material from the Bridgerian (early Eocene) of Wyoming,[2] but was reassigned to Procaimanoidea in 1967 by Wassersug and Hecht.[3] Hassiacosuchus may be the same as Allognathosuchus; Christopher Brochu has recommended continuing to use Hassiacosuchus.[4]

Specimen at Naturhistorischen Museum Basel


  1. ^ Weitzel, K. (1935). "Hassiacosuchus haupti n. g. n. sp., ein durophages Krokodil aus dem Mitteleozän von Messel". Notizblatt des Vereins für Erdkunde und der Hessischen Geologischen Landesanstalt Darmstadt (in German). 16: 40–49. 
  2. ^ Mook, C.C. (1941). "A new crocodilian, Hassiacosuchus kayi, from the Bridger Eocene beds of Wyoming". Annals of the Carnegie Museum. 28: 207–220. 
  3. ^ Wassersug, R.J.; Hecht, M.K. (1967). "The status of the crocodylid genera Procaimanoidea and Hassiacosuchus in the New World". Herpetologica. 23 (1): 30–34. 
  4. ^ Brochu, Christopher A. (2004). "Alligatorine phylogeny and the status of Allognathosuchus Mook, 1921". Journal of Vertebrate Paleontology. 24 (4): 857–873. doi:10.1671/0272-4634(2004)024[0857:APATSO]2.0.CO;2. ISSN 0272-4634. 

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