Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Juanognathus
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Distacodontacea
Family:
Juanognathidae
Formal Genus Name and Reference:
Juanognathus SERPAGLI, 1974, p. 49
Type Species:
variabilis, OD
Images
(Click to enlarge in a new window)
Fig. 93, 1. *J. variabilis, L.Ord.(San Juan F.), S.Am.(Arg.); 1a,c,f-h,k, elements of transition series, post.-lat. views; 1b,d,e,i,j, cross seetions; a,b, X50; c-f,k, X66; g, X52; h-j, X34 (Serpagli, 1974).
Synonyms
Geographic Distribution
S.Am. (Arg.), N.Am., Asia (Malaya)
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:
M.Ord.
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
100
Ending Date:
458.18
Description
Diagnosis as for family = Apparatus unknown but includes nongeniculate and possibly geniculate, coniform, lamellar elements forming symmetry-transition series. Elements elongate, recurved to reclined, with rounded, nonkeeled anterior and posterior margins and more or less oval cross section. Cusp usually twisted with prominent lateral costa on each face. Basal cavity shallow.
References
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Distacodontacea
Family:
Juanognathidae
Formal Genus Name and Reference:
Juanognathus SERPAGLI, 1974, p. 49
Type Species:
variabilis, OD
Images
(Click to enlarge in a new window)
Fig. 93, 1. *J. variabilis, L.Ord.(San Juan F.), S.Am.(Arg.); 1a,c,f-h,k, elements of transition series, post.-lat. views; 1b,d,e,i,j, cross seetions; a,b, X50; c-f,k, X66; g, X52; h-j, X34 (Serpagli, 1974).
Synonyms
Geographic Distribution
S.Am. (Arg.), N.Am., Asia (Malaya)
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:
M.Ord.
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
100
Ending Date:
458.18
Description
Diagnosis as for family = Apparatus unknown but includes nongeniculate and possibly geniculate, coniform, lamellar elements forming symmetry-transition series. Elements elongate, recurved to reclined, with rounded, nonkeeled anterior and posterior margins and more or less oval cross section. Cusp usually twisted with prominent lateral costa on each face. Basal cavity shallow.