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Cheirurus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Phacopida
Superfamily:
Proetacea
Family:
Cheiruridae
Formal Genus Name and Reference:
Cheirurus BEYRICH, 1845
Type Species:
C. insignis; SD BARTON, 1913 (non C. exsul, SD REED, 1896, because this species was not originally assigned to Cheirurus)]
Images
(Click to enlarge in a new window)
Fig. 335, 9. "'C. (C.) insignis, SiI.(Motei beds), Boh.; 9a, exoskeI.; 9a, exoskel., 96, hypostoma, both x1 (370)
Synonyms
Chirurus
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Ord.
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
M.Dev
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Glabella expanding forward, overhanging anterior border, occipital and preoccipital furrows joined at middle. Thorax with 11 segments. Pygidium with 3 pairs of subequal pleural spines and a terminal spine.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Phacopida
Superfamily:
Proetacea
Family:
Cheiruridae
Formal Genus Name and Reference:
Cheirurus BEYRICH, 1845
Type Species:
C. insignis; SD BARTON, 1913 (non C. exsul, SD REED, 1896, because this species was not originally assigned to Cheirurus)]
Images
(Click to enlarge in a new window)
Fig. 335, 9. "'C. (C.) insignis, SiI.(Motei beds), Boh.; 9a, exoskeI.; 9a, exoskel., 96, hypostoma, both x1 (370)
Synonyms
Chirurus
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Ord.
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
M.Dev
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Glabella expanding forward, overhanging anterior border, occipital and preoccipital furrows joined at middle. Thorax with 11 segments. Pygidium with 3 pairs of subequal pleural spines and a terminal spine.