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Monocostodus
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Proconodontacea
Family:
Oneotodidae
Formal Genus Name and Reference:
Monocostodus MILLER, 1980, p. 26
Type Species:
Acodus sevierensis MILLER, 1969, p. 418, M
Images
(Click to enlarge in a new window)
FIG. 69,4. *M. sevierensis (MILLER), USA (Texas) ; 4a, basal oblique view; 4b,c, lat. view, transv. sec. near midcusp; 4d, shape of basal cavity; about X95 (Miller, 1980).
Synonyms
Geographic Distribution
N.Am. (Utah-Nev.-Texas-Okla.-Wyo.- Mont.) -Australia(Queensl.)
Age Range
Beginning Stage in Treatise Usage:
L.Ord. (Symphysurina Z.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord. (Symphysurina Z.)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Slender, erect to reclined, coniform elements, cross section round below about bend in cusp, narrow, sharp costa extending from bend in cusp to tip, costa usually on one or the other side, producing dextral and sinistral specimens, but rare symmetrical specimens have posterior costa, forming a symmetry transition
References
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Proconodontacea
Family:
Oneotodidae
Formal Genus Name and Reference:
Monocostodus MILLER, 1980, p. 26
Type Species:
Acodus sevierensis MILLER, 1969, p. 418, M
Images
(Click to enlarge in a new window)
FIG. 69,4. *M. sevierensis (MILLER), USA (Texas) ; 4a, basal oblique view; 4b,c, lat. view, transv. sec. near midcusp; 4d, shape of basal cavity; about X95 (Miller, 1980).
Synonyms
Geographic Distribution
N.Am. (Utah-Nev.-Texas-Okla.-Wyo.- Mont.) -Australia(Queensl.)
Age Range
Beginning Stage in Treatise Usage:
L.Ord. (Symphysurina Z.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord. (Symphysurina Z.)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Slender, erect to reclined, coniform elements, cross section round below about bend in cusp, narrow, sharp costa extending from bend in cusp to tip, costa usually on one or the other side, producing dextral and sinistral specimens, but rare symmetrical specimens have posterior costa, forming a symmetry transition