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Oneotodus
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Proconodontacea
Family:
Oneotodidae
Formal Genus Name and Reference:
Oneotodus LINDSTRÖM, 1955, p. 581
Type Species:
Distacodus? simplex FURNISH, 1938, p. 328, OD
Images
(Click to enlarge in a new window)
Fig. 69, 3 . *O. simplex (Furnish), lectotype, USA (Iowa), lat. view, X250 (Clark, n).
Synonyms
Geographic Distribution
N.Am.
Age Range
Beginning Stage in Treatise Usage:
L.Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Nongeniculate coniform elements forming apparent symmetry-transition series, Elements proclined to erect, cusp composed entirely of white matter, basal cavity shallow, triangular, terminating in conical tip, anterior edge of basal cavity close to anterior margin of cusp, anterior margin of cusp smooth, remainder of cusp smooth or bearing multiple low costae beginning above basal margin and extending to near tip, cross section subcircular, ellipsoidal, or flattened to recessed posteriorly, depending on presence and distribution of costae, Apparatus consisting of many symmetry variants, ranging from elements with no costae to those with many. [The holotype of O. simplex (FURNISH) is noncostate; slightly younger elements, incorrectly identified as Scolopodus cornutiformis BRANSON & MEHL by various authors, possess numerous costae and are believed to be part of this apparatus. ETHINGTON & BRAND (1981) recommended restriction of Oneolodus to the type species until restudy of other species in the genus is made. Some of these species are assignable to Prooneolodus MULLER & NOGAMI, 1971 and Teridontus MILLER, 1980.]
References
Lindström, Maurits, 1955, Conodonts from the lowermost Ordovician strata of south-central Sweden: Geol. Foeren. Stockholm Foerh., v. 76, h. 4 REFERENCES, , no. 21, p. 517-603, 6 text-fig., 10 pl.
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Proconodontacea
Family:
Oneotodidae
Formal Genus Name and Reference:
Oneotodus LINDSTRÖM, 1955, p. 581
Type Species:
Distacodus? simplex FURNISH, 1938, p. 328, OD
Images
(Click to enlarge in a new window)
Fig. 69, 3 . *O. simplex (Furnish), lectotype, USA (Iowa), lat. view, X250 (Clark, n).
Synonyms
Geographic Distribution
N.Am.
Age Range
Beginning Stage in Treatise Usage:
L.Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Nongeniculate coniform elements forming apparent symmetry-transition series, Elements proclined to erect, cusp composed entirely of white matter, basal cavity shallow, triangular, terminating in conical tip, anterior edge of basal cavity close to anterior margin of cusp, anterior margin of cusp smooth, remainder of cusp smooth or bearing multiple low costae beginning above basal margin and extending to near tip, cross section subcircular, ellipsoidal, or flattened to recessed posteriorly, depending on presence and distribution of costae, Apparatus consisting of many symmetry variants, ranging from elements with no costae to those with many. [The holotype of O. simplex (FURNISH) is noncostate; slightly younger elements, incorrectly identified as Scolopodus cornutiformis BRANSON & MEHL by various authors, possess numerous costae and are believed to be part of this apparatus. ETHINGTON & BRAND (1981) recommended restriction of Oneolodus to the type species until restudy of other species in the genus is made. Some of these species are assignable to Prooneolodus MULLER & NOGAMI, 1971 and Teridontus MILLER, 1980.]
References
Lindström, Maurits, 1955, Conodonts from the lowermost Ordovician strata of south-central Sweden: Geol. Foeren. Stockholm Foerh., v. 76, h. 4 REFERENCES, , no. 21, p. 517-603, 6 text-fig., 10 pl.