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Psilocephalina
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Nileidae
Formal Genus Name and Reference:
Psilocephalina HSÜ, 1948
Type Species:
P. lubrica
Images
(Click to enlarge in a new window)
Synonyms
Geographic Distribution
L.Ord.(Tremadoc.), C. China
Age Range
Beginning Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Differs from Borthaspis in having genal spines and wider axis of pygidium
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Nileidae
Formal Genus Name and Reference:
Psilocephalina HSÜ, 1948
Type Species:
P. lubrica
Images
(Click to enlarge in a new window)Synonyms
Geographic Distribution
L.Ord.(Tremadoc.), C. China
Age Range
Beginning Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Differs from Borthaspis in having genal spines and wider axis of pygidium