Psammodontidae

Psammodontidae
Temporal occurrence
Mississippium (Lower Carboniferous) to Wuchiapingium (Upper Permian)
360.7 to 255.0 million years
Locations
USA, England, Egypt, Pakistan
Systematics
Superclass : Jaw mouths (Gnathostomata) Class : Cartilaginous fish (Chondrichthyes) Subclass : Holocephali Superordinate : Holocephalimorpha Order : Psammodontiformes Family : Psammodontidae
Scientific name of the  order
Psammodontiformes
Obruchev , 1953
Scientific name of the  family
Psammodontidae
de Koninck , 1878

The Psammodontidae or Psammodontiformes are an extinct group of cartilaginous fish , which is only known from finds of isolated fossil tooth plates and occurred from the Lower Carboniferous to the Upper Permian. The tooth plates are square and few of these plates formed a two-row plaster dentition, which was suitable for crushing hard-shelled prey.

It is believed that the Psammodontidae are distant relatives of today's sea ​​cats (Chimaeriformes).

Systematics

The order Psammodontiformes includes the genus Mazodus and the family Psammodontidae, which are in a sister group relationship to one another. The Psammodontidae family includes the three genera Archaeobatis , Lagarodus and Psammodus .

• Psammodontiformes
  • Mazodus
  • Psammodontidae
    • Archaeobatis
    • Lagarodus
    • Psammodus

literature

• Joseph S. Nelson : Fishes of the World , John Wiley & Sons, 2006, ISBN 0-471-25031-7 .
• Alfred Romer : Vertebrate Paleontology. The University of Chicago Press, 1955, ISBN 0-2267-2488-3 .

Individual evidence

1. ↑ Psammodontiformes In: The Paleobiology Database , last accessed on May 11, 2016.