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Aulacosphinctoides

Classification

    Phylum:  
Mollusca
    Class:  
Cephalopoda
    Subclass:  
Ammonoidea
    Order:  
Ceratitida
    Suborder:  
Ammonitina
    Superfamily:  
Perisphinctaceae
    Family:  
Perisphinctidae
    Subfamily:  
Virgatosphinctinae
    Formal Genus Name and Reference:  
Aulacosphinctoides SPATH, 1923
    Type Species:  
Aulacosphinctes infundibulus UHLIG, 1910


Images

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Fig. 426,1. *A. infundibulus/lus (UHLIG), M.Spiti sh., Himalaya; la,b. X0.5 (533*)


Synonyms



Geographic Distribution

Somali.-Cutch- Himalaya-Japan-N. Z. - Mex.-Arg.


Age Range

    Beginning Stage in Treatise Usage:  
U.Kimm.
    Beginning International Stage:  
Kimmeridgian
    Fraction Up In Beginning Stage:  
50
    Beginning Date:  
152.01
    Ending Stage in Treatise Usage:  
L.Tithon.
    Ending International Stage:  
Tithonian
    Fraction Up In Ending Stage:  
70
    Ending Date:  
144.94


Description

Closely resembles and passes into Torquatisphinctes but typically differs by having more rounded or depressed whorls and more sigmoid and frequently triplicate ribbing; lappets present.




References

Spath, L. F., 1923, The ammonites of the Shales-withBeef: Quart. Jour. Geol. Soc. (London), v. 79, p. 66-88.


Museum or Author Information