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Niobella
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Asaphidae
Formal Genus Name and Reference:
Niobella REED, 1931
Type Species:
Niobe homfrayi SALTER, 1866
Images
(Click to enlarge in a new window)
Fig. 262, 7. N. homfrayi smithi Stubblefield, 7 a, b, ceph., pyg., x1.3 (421).
Synonyms
Geographic Distribution
Eu.-?N.Am.(Newf.)
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:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Like Niobe but pygidial doublure narrow in early species and moderately wide in latest species, pygidial pleural ribs (if developed) flattened, merging smoothly into outer part of pygidial surface or at slightly outside line corresponding to inner margin of doublure, ribs mostly with shallow pleural furrow. Evolutionary trend as in Niobe.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Asaphidae
Formal Genus Name and Reference:
Niobella REED, 1931
Type Species:
Niobe homfrayi SALTER, 1866
Images
(Click to enlarge in a new window)
Fig. 262, 7. N. homfrayi smithi Stubblefield, 7 a, b, ceph., pyg., x1.3 (421).
Synonyms
Geographic Distribution
Eu.-?N.Am.(Newf.)
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:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Like Niobe but pygidial doublure narrow in early species and moderately wide in latest species, pygidial pleural ribs (if developed) flattened, merging smoothly into outer part of pygidial surface or at slightly outside line corresponding to inner margin of doublure, ribs mostly with shallow pleural furrow. Evolutionary trend as in Niobe.