Paraisurus

Paraisurus is an extremely rare extinct genus of mackerel sharks of uncertain affinities. It is sometimes placed in the family Cretoxyrhinidae. It lived in the Early Cretaceous, and is known in Europe, North America, and Asia.[1] It is mostly known from isolated teeth, which have a distinct shape. They are mesio-distally compressed, with a large labial protuberance. An associated dentition is known from the Weno Formation of Texas, USA.[2] Though originally presumed to go extinct towards the end of the Albian, an occurrence from the lower Atco formation implies survival into the early Coniacian.[3]

Paraisurus
Temporal range: Aptian - Coniacian
Paraisurus macrorhiza tooth from the Albian of Russia
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Chondrichthyes
Order:
Lamniformes
Family:
Incertae sedis
Genus:
Paraisurus

Glückman 1957

Species

Species within this genus include:[1]

  • Paraisurus macrorhiza
  • Paraisurus compressus
  • Paraisurus amudarjensis

References
  1. Gao, Keqin; Nessov, Lev A. (1998-06-03). "Early Cretaceous Squamates from the Kyzylkum Desert, Uzbekistan". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 207 (3): 289–309. doi:10.1127/njgpa/207/1998/289. ISSN 0077-7749.
  2. Welton, Bruce J.; Farish, Roger F. (1993). The Collector's Guide to Fossil Sharks and Rays from the Cretaceous of Texas. Before Time.
  3. Hamm, Shawn A.; Cucimurri, David J. (2011). "Early Coniacian (Late Cretaceous) selachian fauna from the basal Atco Formation, lower Austin Group, north central Texas". Paludicola. 8.3: 107–127.
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