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Tonkinella
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Corynexochida
Superfamily:
Unknown
Family:
Oryctocephalidae
Formal Genus Name and Reference:
Tonkinella MANSUY, 1916
Type Species:
T. flabelliformis
Images
(Click to enlarge in a new window)
Fig. 162, 6. T. stephensis Kobayashi, B.C., exoskel., x1.5 (448n)
Synonyms
Geographic Distribution
E.Asia-N.Am.
Age Range
Beginning Stage in Treatise Usage:
M.Cam.
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
512.3
Ending Stage in Treatise Usage:
M.Cam.
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Cephalic proportions as in Oryctocephalus but glabellar furrows less distinctly pit-shaped, Thorax with 5 segments, pleurae bluntly terminated, Pygidium semicircular, as large as cephalon, margin rounded, axis tapered, segmented, pleural regions convex, with equally spaced, radially arranged furrows, lacking interpleural grooves, no marginal furrow or border
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Corynexochida
Superfamily:
Unknown
Family:
Oryctocephalidae
Formal Genus Name and Reference:
Tonkinella MANSUY, 1916
Type Species:
T. flabelliformis
Images
(Click to enlarge in a new window)
Fig. 162, 6. T. stephensis Kobayashi, B.C., exoskel., x1.5 (448n)
Synonyms
Geographic Distribution
E.Asia-N.Am.
Age Range
Beginning Stage in Treatise Usage:
M.Cam.
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
512.3
Ending Stage in Treatise Usage:
M.Cam.
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Cephalic proportions as in Oryctocephalus but glabellar furrows less distinctly pit-shaped, Thorax with 5 segments, pleurae bluntly terminated, Pygidium semicircular, as large as cephalon, margin rounded, axis tapered, segmented, pleural regions convex, with equally spaced, radially arranged furrows, lacking interpleural grooves, no marginal furrow or border