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Shirakiella
Classification
Phylum:
Arthropoda
Subphylum:
Trilobitomorpha
Class:
Trilobata
Order:
Ptychopariida
Suborder:
Ptychopariina
Superfamily:
Illaenuracea
Family:
Shirakiellidae
Formal Genus Name and Reference:
Shirakiella KOBAYASHI, 1935
Type Species:
S. elongata
Images
(Click to enlarge in a new window)
Fig. 202, 9. *S. elongata, ceph., x2 (419).
Synonyms
Geographic Distribution
Northeast Asia (Korea)
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian(Kaolishanian) = essesntially Jiangshanian stage
Beginning International Stage:
Jiangshanian
Fraction Up In Beginning Stage:
0
Beginning Date:
494.2
Ending Stage in Treatise Usage:
Upper Cambrian(Kaolishanian) = essesntially Jiangshanian stage
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
100
Ending Date:
491
Description
Characters of family = Exoskeleton opisthoparian. Glabella tapering or truncate-tapering, lateral furrows obsolete; no eye ridges, shallow palpebral furrows; frontal area convex, about 0.25 of length of cranidium; anterior border furrow obsolete or very faint; eyes below medium size, opposite anterior 0.3 of glabella; fixigenae horizontal or upsloping, with arcuate palpebral areas, 0.3 of glabellar width, pos- terior areas triangular, of medium width (exsag.), same in length as occipital ring; librigenae elongate, rectangular, marginal furrows nearly obsolete, with short genal spines. Thorax and pygidium unknown.
References
Museum or Author Information
Classification
Phylum:
Arthropoda
Subphylum:
Trilobitomorpha
Class:
Trilobata
Order:
Ptychopariida
Suborder:
Ptychopariina
Superfamily:
Illaenuracea
Family:
Shirakiellidae
Formal Genus Name and Reference:
Shirakiella KOBAYASHI, 1935
Type Species:
S. elongata
Images
(Click to enlarge in a new window)
Fig. 202, 9. *S. elongata, ceph., x2 (419).
Synonyms
Geographic Distribution
Northeast Asia (Korea)
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian(Kaolishanian) = essesntially Jiangshanian stage
Beginning International Stage:
Jiangshanian
Fraction Up In Beginning Stage:
0
Beginning Date:
494.2
Ending Stage in Treatise Usage:
Upper Cambrian(Kaolishanian) = essesntially Jiangshanian stage
Ending International Stage:
Jiangshanian
Fraction Up In Ending Stage:
100
Ending Date:
491
Description
Characters of family = Exoskeleton opisthoparian. Glabella tapering or truncate-tapering, lateral furrows obsolete; no eye ridges, shallow palpebral furrows; frontal area convex, about 0.25 of length of cranidium; anterior border furrow obsolete or very faint; eyes below medium size, opposite anterior 0.3 of glabella; fixigenae horizontal or upsloping, with arcuate palpebral areas, 0.3 of glabellar width, pos- terior areas triangular, of medium width (exsag.), same in length as occipital ring; librigenae elongate, rectangular, marginal furrows nearly obsolete, with short genal spines. Thorax and pygidium unknown.