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Onchocephalus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ptychopariacea
Family:
Ptychopariidae
Formal Genus Name and Reference:
Onchocephalus RESSER, 1937
Type Species:
Ptychoparia thia WALCOTT, 1917
Images
(Click to enlarge in a new window)
Fig. 175, 7. O. sulcatus Rasetti, L. Cam., Que., cran., X4 (448n).
Synonyms
Geographic Distribution
N.Am.
Age Range
Beginning Stage in Treatise Usage:
L. Cam.(“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale)
Beginning International Stage:
Cambrian Stage 3
Fraction Up In Beginning Stage:
0
Beginning Date:
521
Ending Stage in Treatise Usage:
Low.M.Cam.
Ending International Stage:
Wuliuan
Fraction Up In Ending Stage:
100
Ending Date:
504.5
Description
Glabella low, eyes opposite glabellar mid-length, anterior sections of facial sutures parallel or slightly convergent, posterior areas of fixigenae as wide (tr.) as occipital ring. Intergrades with Antagmus, Crassifimbra, Eoptychoparia and Proliostracts.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ptychopariacea
Family:
Ptychopariidae
Formal Genus Name and Reference:
Onchocephalus RESSER, 1937
Type Species:
Ptychoparia thia WALCOTT, 1917
Images
(Click to enlarge in a new window)
Fig. 175, 7. O. sulcatus Rasetti, L. Cam., Que., cran., X4 (448n).
Synonyms
Geographic Distribution
N.Am.
Age Range
Beginning Stage in Treatise Usage:
L. Cam.(“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale)
Beginning International Stage:
Cambrian Stage 3
Fraction Up In Beginning Stage:
0
Beginning Date:
521
Ending Stage in Treatise Usage:
Low.M.Cam.
Ending International Stage:
Wuliuan
Fraction Up In Ending Stage:
100
Ending Date:
504.5
Description
Glabella low, eyes opposite glabellar mid-length, anterior sections of facial sutures parallel or slightly convergent, posterior areas of fixigenae as wide (tr.) as occipital ring. Intergrades with Antagmus, Crassifimbra, Eoptychoparia and Proliostracts.