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Borthaspidella
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Nileidae
Formal Genus Name and Reference:
Borthaspidella RASETTI, 1954
Type Species:
B. gaspensis
Images
(Click to enlarge in a new window)
Fig. 267, 2. *B. gaspensis, Can., 2a, b, cran., pyg. (reconstr.), x3 (202).
Synonyms
Geographic Distribution
E.N.Am., PC.Asia
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 well-impressed axial furrows delimiting a better-defined glabella with strongly expanded anterior third
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Nileidae
Formal Genus Name and Reference:
Borthaspidella RASETTI, 1954
Type Species:
B. gaspensis
Images
(Click to enlarge in a new window)
Fig. 267, 2. *B. gaspensis, Can., 2a, b, cran., pyg. (reconstr.), x3 (202).
Synonyms
Geographic Distribution
E.N.Am., PC.Asia
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 well-impressed axial furrows delimiting a better-defined glabella with strongly expanded anterior third