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Thomasites
Classification
Phylum:
Unknown
Class:
Unknown
Order:
Unknown
Superfamily:
Acanthocerataceae
Family:
Pseudotissotiidae
Formal Genus Name and Reference:
Thomasites PERVINQUIÈRE, 1907, p. 339
Type Species:
Pachydiscus rollandi Peron, 1889, p. 25, SD DIENER, 1925, p. 103
Images
(Click to enlarge in a new window)
Fig. 137, 1a-c. *T. rollandi (Peron), Tunisia, a, b, X 1, c, enlarged (Pervinquière, 1907)., Fig. 137, 1d, e. T. gongilense (Woods), Nigeria, X0.75 (Woods, 1911).
Synonyms
Gombeoceras; Koulabiceras; Ferganites
Geographic Distribution
England, Spain, northern and western Africa, Madagascar, Syria, Israel, Oman, Turkestan, Texas, Peru
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Lower Turonian)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
Upper Cretaceous (Lower Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
25
Ending Date:
92.77
Description
Involute and globose when young, later whorl section becoming bluntly triangular, with 4 or 5 umbilical tubercles to each whorl, each giving rise to 2 or 3 faint, broad ribs that end in slight, blunt ventrolateral tubercles, a row of siphonal tubercles, commonly weak, also present, finally all ornament disappearing, aperture may be (always?) constricted. Suture variable, with moderately long to short, simplifying elements.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Unknown
Order:
Unknown
Superfamily:
Acanthocerataceae
Family:
Pseudotissotiidae
Formal Genus Name and Reference:
Thomasites PERVINQUIÈRE, 1907, p. 339
Type Species:
Pachydiscus rollandi Peron, 1889, p. 25, SD DIENER, 1925, p. 103
Images
(Click to enlarge in a new window)
Fig. 137, 1a-c. *T. rollandi (Peron), Tunisia, a, b, X 1, c, enlarged (Pervinquière, 1907)., Fig. 137, 1d, e. T. gongilense (Woods), Nigeria, X0.75 (Woods, 1911).
Synonyms
Gombeoceras; Koulabiceras; Ferganites
Geographic Distribution
England, Spain, northern and western Africa, Madagascar, Syria, Israel, Oman, Turkestan, Texas, Peru
Age Range
Beginning Stage in Treatise Usage:
Upper Cretaceous (Lower Turonian)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
Upper Cretaceous (Lower Turonian)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
25
Ending Date:
92.77
Description
Involute and globose when young, later whorl section becoming bluntly triangular, with 4 or 5 umbilical tubercles to each whorl, each giving rise to 2 or 3 faint, broad ribs that end in slight, blunt ventrolateral tubercles, a row of siphonal tubercles, commonly weak, also present, finally all ornament disappearing, aperture may be (always?) constricted. Suture variable, with moderately long to short, simplifying elements.