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Westergaardites
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Olenacea
Family:
Olenidea
Formal Genus Name and Reference:
Westergaardites TROEDSSON, 1937
Type Species:
W. pelturaeformis
Images
(Click to enlarge in a new window)
Fig. 197, 4. *W. pelturaeformis, E.T'ien-shan, exoskel. without librigenae, x1.3 (301).
Synonyms
Geographic Distribution
C.Asia
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
0
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
Differs from Triarthrus in having extremely long exoskeleton, wider anterior areas of fixigenae, smaller, more anteriorly placed eyes, thorax of 19 segments with extremely wide axis, extremely narrow pleural regions, pleural spines, and pygidium with marginal spines
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Olenacea
Family:
Olenidea
Formal Genus Name and Reference:
Westergaardites TROEDSSON, 1937
Type Species:
W. pelturaeformis
Images
(Click to enlarge in a new window)
Fig. 197, 4. *W. pelturaeformis, E.T'ien-shan, exoskel. without librigenae, x1.3 (301).
Synonyms
Geographic Distribution
C.Asia
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
0
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
Differs from Triarthrus in having extremely long exoskeleton, wider anterior areas of fixigenae, smaller, more anteriorly placed eyes, thorax of 19 segments with extremely wide axis, extremely narrow pleural regions, pleural spines, and pygidium with marginal spines