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Yohoaspis
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ptychopariacea
Family:
Ptychopariidae
Formal Genus Name and Reference:
Yohoaspis RASETTI, 1951
Type Species:
Y. pachycephala
Images
(Click to enlarge in a new window)
Fig. 170, 7. *Y. pachycephala, Cathedral F., cran., x1 (197*).
Synonyms
Geographic Distribution
B.C.
Age Range
Beginning Stage in Treatise Usage:
M.Cam.
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
40
Beginning Date:
512.3
Ending Stage in Treatise Usage:
M.Cam.
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
50
Ending Date:
498.75
Description
Glabella strongly convex, with indistinct furrows, frontal area consisting of border only, border furrow running into axial furrows in front of glabella, palpebral lobes narrow, moderately long, set off by palpebral furrows, eye ridges poorly developed, fixigenae very convex. M.Cam., B.C.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Ptychopariacea
Family:
Ptychopariidae
Formal Genus Name and Reference:
Yohoaspis RASETTI, 1951
Type Species:
Y. pachycephala
Images
(Click to enlarge in a new window)
Fig. 170, 7. *Y. pachycephala, Cathedral F., cran., x1 (197*).
Synonyms
Geographic Distribution
B.C.
Age Range
Beginning Stage in Treatise Usage:
M.Cam.
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
40
Beginning Date:
512.3
Ending Stage in Treatise Usage:
M.Cam.
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
50
Ending Date:
498.75
Description
Glabella strongly convex, with indistinct furrows, frontal area consisting of border only, border furrow running into axial furrows in front of glabella, palpebral lobes narrow, moderately long, set off by palpebral furrows, eye ridges poorly developed, fixigenae very convex. M.Cam., B.C.