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Parachirognathus
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Gondolellacea
Family:
Ellisoniidae
Formal Genus Name and Reference:
Parachirognathus CLARK, 1959, p. 311
Type Species:
P. ethingtoni, OD
Images
(Click to enlarge in a new window)
FIG. 103,2. 0p. ethingtoni, USA (Nev.); ? Sb element, post. view, X50 (Sweet & others, 1971).
Synonyms
Geographic Distribution
N.Am.-Eu.
Age Range
Beginning Stage in Treatise Usage:
L.Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
L.Trias.
Ending International Stage:
Olenekian
Fraction Up In Ending Stage:
100
Ending Date:
246.7
Description
Known apparatus bi- or trimembrate: Sa element alate with no posterior process, grading to closely similar, bowed bipennate Sc element. All elements hyaline, with small basal pits surrounded by narrow flattened areas grading on inner sides of elements into broad, semicircular zones of recessive basal margin, upper edges of margin marked by arched rib at base of denticle series.
References
Clark, D. L., 1959, Conodonts from the Triassic of Nevada and Utah: J. Paleontol., v. 33, p. 305312, 1 text-fig., pl. 44, 45.
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Gondolellacea
Family:
Ellisoniidae
Formal Genus Name and Reference:
Parachirognathus CLARK, 1959, p. 311
Type Species:
P. ethingtoni, OD
Images
(Click to enlarge in a new window)
FIG. 103,2. 0p. ethingtoni, USA (Nev.); ? Sb element, post. view, X50 (Sweet & others, 1971).
Synonyms
Geographic Distribution
N.Am.-Eu.
Age Range
Beginning Stage in Treatise Usage:
L.Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
L.Trias.
Ending International Stage:
Olenekian
Fraction Up In Ending Stage:
100
Ending Date:
246.7
Description
Known apparatus bi- or trimembrate: Sa element alate with no posterior process, grading to closely similar, bowed bipennate Sc element. All elements hyaline, with small basal pits surrounded by narrow flattened areas grading on inner sides of elements into broad, semicircular zones of recessive basal margin, upper edges of margin marked by arched rib at base of denticle series.
References
Clark, D. L., 1959, Conodonts from the Triassic of Nevada and Utah: J. Paleontol., v. 33, p. 305312, 1 text-fig., pl. 44, 45.