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Rossaspis
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Phacopida
Superfamily:
Proetacea
Family:
Pliomeridae
Formal Genus Name and Reference:
Rossaspis Harrington, 1957
Type Species:
Protopliomerops superciliosa ROSS, 1951
Images
(Click to enlarge in a new window)
Fig. 347, 2. * R. superciliosa (Ross), Idaho, 2a, cran. (holotype), x4, 2 b, pyg. (paratype), x4, 2 c, hypostoma (paratype), x10.5 (463*).
Synonyms
Geographic Distribution
USA (Idaho), Arg.
Age Range
Beginning Stage in Treatise Usage:
L.Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Differs from Protopliomerops in having glabella elliptical in outline, anterior (3p) lateral glabellar furrows located at anterolateral angles of glabella, genal angles bluntly spinose. Pygidium with narrower axis and outstretched pleurae directed outward, then gently curved backward-outward, terminal axial pieces trapezoidal in outline reaching posterior margin, separating posterior pleurae. Hypostoma rounded posteriorly.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Phacopida
Superfamily:
Proetacea
Family:
Pliomeridae
Formal Genus Name and Reference:
Rossaspis Harrington, 1957
Type Species:
Protopliomerops superciliosa ROSS, 1951
Images
(Click to enlarge in a new window)
Fig. 347, 2. * R. superciliosa (Ross), Idaho, 2a, cran. (holotype), x4, 2 b, pyg. (paratype), x4, 2 c, hypostoma (paratype), x10.5 (463*).
Synonyms
Geographic Distribution
USA (Idaho), Arg.
Age Range
Beginning Stage in Treatise Usage:
L.Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Differs from Protopliomerops in having glabella elliptical in outline, anterior (3p) lateral glabellar furrows located at anterolateral angles of glabella, genal angles bluntly spinose. Pygidium with narrower axis and outstretched pleurae directed outward, then gently curved backward-outward, terminal axial pieces trapezoidal in outline reaching posterior margin, separating posterior pleurae. Hypostoma rounded posteriorly.