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Ammagnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Ammagnostus ÖPIK, 1967, p. 137
Type Species:
*A. psammius; OD; holotype (ÖPIK, 1967, pl. 66, fig. 3), CPC 5937, AGSO, Canberra
Images
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Geographic Distribution
northern Greenland; Australia (Queensland), E. eretes to G. stolidotus Zones; Kazakhstan, K. simplex to G. stolidotus Zones; China (Zhejiang), L. sinensis Zone, (Hunan), A. integriceps or Chatiania Zone; ?USA (Montana), Cedaria Zone; ?Antarctica, Aphelaspis Zone.
Age Range
Beginning Stage in Treatise Usage:
lower Upper Cambrian
Beginning International Stage:
Fraction Up In Beginning Stage:
0
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
En grande tenue or with pygidial axial furrows effaced posteriorly. Median preglabellar furrow absent. Glabella with ogival to subpentagonal anterior lobe; F3 straight or concave forward; a broad, anteriorly tapering posterior lobe with variably developed F2 furrow and broadly rounded glabellar culmination; glabellar node immediately behind F2 furrows.