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Agerina
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Bathyuracea
Family:
Bathyuridae
Formal Genus Name and Reference:
Agerina TJERNVIK, 1956
Type Species:
A. erratica
Images
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Synonyms
Geographic Distribution
Eu.(Swed.USSR)
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:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Subrectangular glabella with 3 pairs of lateral furrows, rostral plate triangular, genal spines short. Thorax of 8 segments (species from USSR). Pygidium short, with 3 or 4 axial rings.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Bathyuracea
Family:
Bathyuridae
Formal Genus Name and Reference:
Agerina TJERNVIK, 1956
Type Species:
A. erratica
Images
(Click to enlarge in a new window)Synonyms
Geographic Distribution
Eu.(Swed.USSR)
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:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Subrectangular glabella with 3 pairs of lateral furrows, rostral plate triangular, genal spines short. Thorax of 8 segments (species from USSR). Pygidium short, with 3 or 4 axial rings.