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Paracordylodus
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Paracordylodontidae
Formal Genus Name and Reference:
Paracordylodus LINDSTRÖM, 1955, p. 584
Type Species:
P. gracilis, OD
Images
(Click to enlarge in a new window)
Fic. 75, 2. * P. gracilis, USA (Pa.), *, dolabrate element, *, geniculate element, * (Bergström, Epstein, & Epstein, 1972)
Synonyms
Geographic Distribution
Eu.-N.Am.-S.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
Diagnosis as for family = Apparatus probably bimembrate but may contain additional elements; elements lamellar, strongly laterally compressed, geniculate and dolabrate with recurved carinate cusp. Geniculate elements with arched, anteroposteriorly extended base. Dolabrate elements with adenticulate anterior process directed posteriorly and downward and with an essentially straight denticulate posterior process of similar length as anterior process; denticles reclined, strongly laterally compressed, discrete, highest at midlength of process. Basal cavity shallow and small in both types of elements. Cusp, denticles, and anterior process striae. [VAN WAMEL (1974) proposed that the apparatus of Paracordylodus gracilis includes an additional element, but study of available collections of that species from Europe and North and South America has not yet confirmed the correctness of that view. Apparatus reconstruction: BERGSTROM, EpSTEIN, & EpSTEIN, 1972; SWEET & BERGSTROM, 1972.J
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:
Prioniodontacea
Family:
Paracordylodontidae
Formal Genus Name and Reference:
Paracordylodus LINDSTRÖM, 1955, p. 584
Type Species:
P. gracilis, OD
Images
(Click to enlarge in a new window)
Fic. 75, 2. * P. gracilis, USA (Pa.), *, dolabrate element, *, geniculate element, * (Bergström, Epstein, & Epstein, 1972)
Synonyms
Geographic Distribution
Eu.-N.Am.-S.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
Diagnosis as for family = Apparatus probably bimembrate but may contain additional elements; elements lamellar, strongly laterally compressed, geniculate and dolabrate with recurved carinate cusp. Geniculate elements with arched, anteroposteriorly extended base. Dolabrate elements with adenticulate anterior process directed posteriorly and downward and with an essentially straight denticulate posterior process of similar length as anterior process; denticles reclined, strongly laterally compressed, discrete, highest at midlength of process. Basal cavity shallow and small in both types of elements. Cusp, denticles, and anterior process striae. [VAN WAMEL (1974) proposed that the apparatus of Paracordylodus gracilis includes an additional element, but study of available collections of that species from Europe and North and South America has not yet confirmed the correctness of that view. Apparatus reconstruction: BERGSTROM, EpSTEIN, & EpSTEIN, 1972; SWEET & BERGSTROM, 1972.J
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.