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Hysterolenus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ceratopygacea
Family:
Ceratopygidae
Formal Genus Name and Reference:
Hysterolenus MOBERG, 1898
Type Species:
H. törnquisti
Images
(Click to enlarge in a new window)
Fig. 271, 4. *H. toernquisti, Swed., 4 a, b, ceph., pyg., x1.5, 4c, hypostoma, x1.3 (153).
Synonyms
Geographic Distribution
L.Ord.(Tremadoc.), Eu.?C.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 Ceratopyge in having parallel-sided glabella with rounded front, 4 pairs of distinctly marked lateral glabellar furrows, and larger, subtriangular pygidium with about 10 axial rings, at least 6 defined segments in pleural fields, concave border, and 2nd segment produced into pleural spines
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ceratopygacea
Family:
Ceratopygidae
Formal Genus Name and Reference:
Hysterolenus MOBERG, 1898
Type Species:
H. törnquisti
Images
(Click to enlarge in a new window)
Fig. 271, 4. *H. toernquisti, Swed., 4 a, b, ceph., pyg., x1.5, 4c, hypostoma, x1.3 (153).
Synonyms
Geographic Distribution
L.Ord.(Tremadoc.), Eu.?C.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 Ceratopyge in having parallel-sided glabella with rounded front, 4 pairs of distinctly marked lateral glabellar furrows, and larger, subtriangular pygidium with about 10 axial rings, at least 6 defined segments in pleural fields, concave border, and 2nd segment produced into pleural spines