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Eoconodontus
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Proconodontacea
Family:
Cordylododontidae
Formal Genus Name and Reference:
Eoconodontus MILLER, 1980, p. 21
Type Species:
[ *Proconodont us notchpeakensis MIILLER, 1969, p. 438; M
Images
(Click to enlarge in a new window)
FIG. 68, 1. *E. notchpeakensis (MILLER), U.Cam., USA (Texas); 1a, b, symmetrical element, lat. view, transv. sec., X 110; 1 c-e, asymmetrical element, lat. view, transv. secs. near midcusp and base, X 110 (Miller, 1980).
Synonyms
Geographic Distribution
N.Am. (Pa.Wis.-widespread in W. and SW. states of USA-Alberta-Dist. Mackenzie-Oaxaca)-Asia ( ? China-Korea-Sib.-Turkey-Iran)-Australia (Queensl.).
Age Range
Beginning Stage in Treatise Usage:
U.Cam. (Trempeal.)
Beginning International Stage:
Jiangshanian
Fraction Up In Beginning Stage:
87.5
Beginning Date:
491.4
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Inferred bimembrate apparatus; elements nongeniculate coniform, proclined to erect; basal cavity large and moderately deep to very deep; cusp very short to long and composed of white matter. Asymmetrical element bent laterally wilh carina on concave side; cusp strongly compressed laterall}', anterior and posterior keels prominent. Symmetrical element lacking carina, in some with prominent anterior and posterior keel, in some keels lost, resulting in oval cross section. Symmetrical element 2 to 3 times as abundant as asymmetrical clement.
References
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Proconodontacea
Family:
Cordylododontidae
Formal Genus Name and Reference:
Eoconodontus MILLER, 1980, p. 21
Type Species:
[ *Proconodont us notchpeakensis MIILLER, 1969, p. 438; M
Images
(Click to enlarge in a new window)
FIG. 68, 1. *E. notchpeakensis (MILLER), U.Cam., USA (Texas); 1a, b, symmetrical element, lat. view, transv. sec., X 110; 1 c-e, asymmetrical element, lat. view, transv. secs. near midcusp and base, X 110 (Miller, 1980).
Synonyms
Geographic Distribution
N.Am. (Pa.Wis.-widespread in W. and SW. states of USA-Alberta-Dist. Mackenzie-Oaxaca)-Asia ( ? China-Korea-Sib.-Turkey-Iran)-Australia (Queensl.).
Age Range
Beginning Stage in Treatise Usage:
U.Cam. (Trempeal.)
Beginning International Stage:
Jiangshanian
Fraction Up In Beginning Stage:
87.5
Beginning Date:
491.4
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Inferred bimembrate apparatus; elements nongeniculate coniform, proclined to erect; basal cavity large and moderately deep to very deep; cusp very short to long and composed of white matter. Asymmetrical element bent laterally wilh carina on concave side; cusp strongly compressed laterall}', anterior and posterior keels prominent. Symmetrical element lacking carina, in some with prominent anterior and posterior keel, in some keels lost, resulting in oval cross section. Symmetrical element 2 to 3 times as abundant as asymmetrical clement.