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Polygnathoides
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Pterospathodontidae
Formal Genus Name and Reference:
Polygnathoides Branson & MEHL, 1933a, p. 50
Type Species:
P. siluricus, OD
Images
(Click to enlarge in a new window)
Fig. 83, 2. *P. siluricus, P. siluricus Z. (Roberts Mts. F.), USA (Nev.), 2a, b, Pa element, lower and upper views, X27 (Klapper & Murphy, 1975).
Synonyms
Geographic Distribution
Eu.-N.Am.-Australia
Age Range
Beginning Stage in Treatise Usage:
Sil. (Ltudlov.)
Beginning International Stage:
Gorstian
Fraction Up In Beginning Stage:
0
Beginning Date:
426.74
Ending Stage in Treatise Usage:
Sil. (Ltudlov.)
Ending International Stage:
Ludfordian
Fraction Up In Ending Stage:
100
Ending Date:
422.73
Description
Pa element carminiplanate with short secondary keels extending from transversely extended pit, Pb element anguliplanate with well-developed platform on inner side and prominent cusp. [Reconstruction: COOPER, 1974b, p. 187, text-fig. 8D.]
References
Branson, E. B., & Branson, C. C., , & Mehl, M. G., 1933a, Conodont studies no. 1: Conodonts from the Harding sandstone of Colorado; Bainbridge (Silurian) of Missouri; Jefferson City (Lower Ordovician) of Missouri: Univ. Mo. Stud., v. 8, no. 1, p. 5-72, pl. 1-4.
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Pterospathodontidae
Formal Genus Name and Reference:
Polygnathoides Branson & MEHL, 1933a, p. 50
Type Species:
P. siluricus, OD
Images
(Click to enlarge in a new window)
Fig. 83, 2. *P. siluricus, P. siluricus Z. (Roberts Mts. F.), USA (Nev.), 2a, b, Pa element, lower and upper views, X27 (Klapper & Murphy, 1975).
Synonyms
Geographic Distribution
Eu.-N.Am.-Australia
Age Range
Beginning Stage in Treatise Usage:
Sil. (Ltudlov.)
Beginning International Stage:
Gorstian
Fraction Up In Beginning Stage:
0
Beginning Date:
426.74
Ending Stage in Treatise Usage:
Sil. (Ltudlov.)
Ending International Stage:
Ludfordian
Fraction Up In Ending Stage:
100
Ending Date:
422.73
Description
Pa element carminiplanate with short secondary keels extending from transversely extended pit, Pb element anguliplanate with well-developed platform on inner side and prominent cusp. [Reconstruction: COOPER, 1974b, p. 187, text-fig. 8D.]
References
Branson, E. B., & Branson, C. C., , & Mehl, M. G., 1933a, Conodont studies no. 1: Conodonts from the Harding sandstone of Colorado; Bainbridge (Silurian) of Missouri; Jefferson City (Lower Ordovician) of Missouri: Univ. Mo. Stud., v. 8, no. 1, p. 5-72, pl. 1-4.