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 FOSSILS VERTEBRATES CHONDRICHTHYES TERMINOLOGY REFERENCES LINKS

 

UNDEFINED
Cretodus  (Sokolov, 1965)
Archaeolamna (xxxxxx) Charlie is defining a family for this
Paraisurus (Glückman 1957)
 

ADD ARCHAEOLAMNA LOGO TOO IS THIS IS CONFIRMED

 

The

Cretodus belongs in an undefined family according to Charlie

[D. Ward I would keep Protolamna in the same family as Cretodus.] = Eoptolaminds according to Charlie??

cutting or tearing??

  • Cut — Cutting:   Upper and lower toothbands are of similar design. The teeth are wide, labio-lingually compressed, erect or distally directed and usually serrate. A single lateral and 1 or more anterior rows are functional Overall dentition appearance would be that of a serrate knife.

    • Tearing:   Characterized by elongated teeth with a strong cutting edge. Anterior positions have multiple functional rows. Laterals are usually broader (approaching the cutting-design) with one row functional.

     
    >>>And finally, is Cretodus crassidens still a valid species?

    Schwimmer et al. (2002) sunk Cretodus crassidens into C. semiplicatus, but I and some of my colleagues who know Cenomanian-Turonian elasmobranchs perhaps better than Schwimmer agree that they are not the same taxon: i.e., I believe that C. crassidens is a valid taxaon (e.g., see
    www.nmnaturalhistory.org/science/bulletins/35/sci_bulletin35_20.pdf) - Kenshu Shimada

     

     

     

    and shots from other angles plus new Booth pics

     

    Joe Schimin - Guy says this is Archaeolamna kopingensis

     

     

     

    1).  (A) (x2, Willett Collection, Booth Museum, BMB 007870, by kind permission of John Cooper).

     

     A  B

    2).  Specim(B) x4.0, White Chalk, Charlton, BMNH (British Museum (Natural History) London) 31190.  Image © 2005 The Natural History Museum, by kind permission.