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Plectodina
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Cyrtoniodontidae
Formal Genus Name and Reference:
Plectodina STAUFFER, 1935a, p. 152
Type Species:
Prioniodus aculeatus Stauffer, 1930, p. 126, OD, = Plectodina dilata STAUFFER, 1935a
Images
(Click to enlarge in a new window)
Fig. 72, 3. Plectodina sp., U.Ord. (Cobourg F.), Can. (Ont.), 3a, Pa element, lat. view, 3 b, Pb element, lat. view, 3 c, M element, lat. view, 3d, Sc element, lat. view, 3 e, S b element, lat. view, 3 f, S a element, post. view, × 55 (Bergström, n)"
Synonyms
Trichonodella; Eoligonodina; ?Zygognathus
Geographic Distribution
N. Am.-Eu.-Australia-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 basically seximembrate, elements lamellar, P elements carminate to angulate or pastinate with laterally partly confluent denticles, in some species, Pa elements with short lateral process or costa, M elements dolabrate or digyrate, with basal cavity wall flaring laterally, S elements forming symmetry transition series from dolabrate or bipennate through digyrate to alate elements, cusp of S elements long, slender, denticles shorter than cusp, discrete along part of length, of relatively uniform size, basal cavity shallow and narrow in all elements, extending along all processes. [Apparatus reconstruction: BERGSTROM & SWEET, 1966; SWEET & BERGSTROM, 1972.)
References
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Cyrtoniodontidae
Formal Genus Name and Reference:
Plectodina STAUFFER, 1935a, p. 152
Type Species:
Prioniodus aculeatus Stauffer, 1930, p. 126, OD, = Plectodina dilata STAUFFER, 1935a
Images
(Click to enlarge in a new window)
Fig. 72, 3. Plectodina sp., U.Ord. (Cobourg F.), Can. (Ont.), 3a, Pa element, lat. view, 3 b, Pb element, lat. view, 3 c, M element, lat. view, 3d, Sc element, lat. view, 3 e, S b element, lat. view, 3 f, S a element, post. view, × 55 (Bergström, n)"
Synonyms
Trichonodella; Eoligonodina; ?Zygognathus
Geographic Distribution
N. Am.-Eu.-Australia-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 basically seximembrate, elements lamellar, P elements carminate to angulate or pastinate with laterally partly confluent denticles, in some species, Pa elements with short lateral process or costa, M elements dolabrate or digyrate, with basal cavity wall flaring laterally, S elements forming symmetry transition series from dolabrate or bipennate through digyrate to alate elements, cusp of S elements long, slender, denticles shorter than cusp, discrete along part of length, of relatively uniform size, basal cavity shallow and narrow in all elements, extending along all processes. [Apparatus reconstruction: BERGSTROM & SWEET, 1966; SWEET & BERGSTROM, 1972.)