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Aphelognathus
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Cyrtoniodontidae
Formal Genus Name and Reference:
Aphelognathus Branson, Mehl, & BRANSON, 1951, p. 9
Type Species:
A. grandis, OD
Images
(Click to enlarge in a new window)
Fig. 73, 2. *A. grandis, U. Ord., USA (Colo.), 2a, Pb element, lat. view, × 70, 2b, M element, lat. view, × 61, 2c, Sa element, post. view, × 79, 2d, Sc element, lat. view, × 61, 2e, Sb element, post.-lat. view, × 70, 2f, Pa element, lat. view, × 79 (Shatzer, 1976)
Synonyms
Geographic Distribution
M.Ord.-U.Ord., N.Am.-Asia (Sib.)
Age Range
Beginning Stage in Treatise Usage:
M.Ord.
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
U.Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Apparatus probably septimembrate, including lamellar elements, Pa elements angulate, in some species with distinct gap in denticle row immediately anterior to subcentral cusp, denticles robust, confluent along most of length, basal cavity flaring laterally, particularly large beneath cusp, but extending along entire under side of element, Pb elements pastinate in some species, bipennate in others, with denticles similar to those in Pa element, M elements dolabrate with laterally flaring base, bipennate in some species, S elements forming transition series from alate through digyrate to dolabrate or bipennate units, each with prominent cusp, in cross section robust denticles more or less rounded, basal cavity well-developed, extending along entire length of processes. [Aphelognathus is similar in many respects to Plectodina, but differs in form of the Pa element. Apparatus reconstruction: SWEET, THOMPSON, & SATTERFIELD, 1975.)
References
Branson, E. B., & Branson, C. C., , & Mehl, M. G., , & Branson, C. C., 1951, Richmond conodonts of Kentucky and Indiana: J. Paleontol., v. 25, p. 1-17, 1 text-fig., pl. 1-4.
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Cyrtoniodontidae
Formal Genus Name and Reference:
Aphelognathus Branson, Mehl, & BRANSON, 1951, p. 9
Type Species:
A. grandis, OD
Images
(Click to enlarge in a new window)
Fig. 73, 2. *A. grandis, U. Ord., USA (Colo.), 2a, Pb element, lat. view, × 70, 2b, M element, lat. view, × 61, 2c, Sa element, post. view, × 79, 2d, Sc element, lat. view, × 61, 2e, Sb element, post.-lat. view, × 70, 2f, Pa element, lat. view, × 79 (Shatzer, 1976)
Synonyms
Geographic Distribution
M.Ord.-U.Ord., N.Am.-Asia (Sib.)
Age Range
Beginning Stage in Treatise Usage:
M.Ord.
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
U.Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Apparatus probably septimembrate, including lamellar elements, Pa elements angulate, in some species with distinct gap in denticle row immediately anterior to subcentral cusp, denticles robust, confluent along most of length, basal cavity flaring laterally, particularly large beneath cusp, but extending along entire under side of element, Pb elements pastinate in some species, bipennate in others, with denticles similar to those in Pa element, M elements dolabrate with laterally flaring base, bipennate in some species, S elements forming transition series from alate through digyrate to dolabrate or bipennate units, each with prominent cusp, in cross section robust denticles more or less rounded, basal cavity well-developed, extending along entire length of processes. [Aphelognathus is similar in many respects to Plectodina, but differs in form of the Pa element. Apparatus reconstruction: SWEET, THOMPSON, & SATTERFIELD, 1975.)
References
Branson, E. B., & Branson, C. C., , & Mehl, M. G., , & Branson, C. C., 1951, Richmond conodonts of Kentucky and Indiana: J. Paleontol., v. 25, p. 1-17, 1 text-fig., pl. 1-4.