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Idamea
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Leiostegiacea
Family:
Leiostegiidae
Formal Genus Name and Reference:
Idamea WHITEHOUSE, 1939
Type Species:
I. venusta
Images
(Click to enlarge in a new window)
Synonyms
Geographic Distribution
Austral.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Glabella convex, subrectangular, front rounded, without lateral furrows, no preglabellar field, eyes of medium size, posterior to center of glabella, fixigenae with palpebral areas about 0.5 of glabellar width. Pygidium broadly transverse, axis narrower than pleural fields; 5 or 6 axial rings, 3 or 4 pleurae; border furrow shallow, border medium (340)
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Leiostegiacea
Family:
Leiostegiidae
Formal Genus Name and Reference:
Idamea WHITEHOUSE, 1939
Type Species:
I. venusta
Images
(Click to enlarge in a new window)Synonyms
Geographic Distribution
Austral.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Glabella convex, subrectangular, front rounded, without lateral furrows, no preglabellar field, eyes of medium size, posterior to center of glabella, fixigenae with palpebral areas about 0.5 of glabellar width. Pygidium broadly transverse, axis narrower than pleural fields; 5 or 6 axial rings, 3 or 4 pleurae; border furrow shallow, border medium (340)