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Crepicephalina
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Crepicephalacea
Family:
Crepicephalidea
Formal Genus Name and Reference:
Crepicephalina RESSER & ENDO, in KOBAYASHI, 1935 KOBAYASHI (non RESSER & ENDO), 1935
Type Species:
Crepieephalus eonvexus WALCOTT, 1913]
Images
(Click to enlarge in a new window)
Fig. 187, 2. ·C. eonvexa (WALCOTT), Liau-tung, Manch.; 2a,b, cran.; 2e,d, pyg., both X2 (37).
Synonyms
Mesoerepieephalus
Geographic Distribution
E.Asia
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
Eyes slightly behind center of glabella; palpebral furrows deep but eye ridges faint; preglabellar area narrow to absent; with occipital node or short spine; fixigenae horizontal, with palpebral area less than 0.5 of glabellar width, posterior area of medium length (tr.). Pygidium subquadrate; axis convex, wider than pleural regions, 0.8 of pygidial length, with 2 to 4 axial rings; 3 low, broad pleurae curve sharply back into base of spines, border along posterior only.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Crepicephalacea
Family:
Crepicephalidea
Formal Genus Name and Reference:
Crepicephalina RESSER & ENDO, in KOBAYASHI, 1935 KOBAYASHI (non RESSER & ENDO), 1935
Type Species:
Crepieephalus eonvexus WALCOTT, 1913]
Images
(Click to enlarge in a new window)
Fig. 187, 2. ·C. eonvexa (WALCOTT), Liau-tung, Manch.; 2a,b, cran.; 2e,d, pyg., both X2 (37).
Synonyms
Mesoerepieephalus
Geographic Distribution
E.Asia
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
Eyes slightly behind center of glabella; palpebral furrows deep but eye ridges faint; preglabellar area narrow to absent; with occipital node or short spine; fixigenae horizontal, with palpebral area less than 0.5 of glabellar width, posterior area of medium length (tr.). Pygidium subquadrate; axis convex, wider than pleural regions, 0.8 of pygidial length, with 2 to 4 axial rings; 3 low, broad pleurae curve sharply back into base of spines, border along posterior only.