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Meteoraspis
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Crepicephalacea
Family:
Tricrepicephalidea
Formal Genus Name and Reference:
Meteoraspis RESSER, 1935
Type Species:
Ptychoparia? metra WALCOTT, 1890
Images
(Click to enlarge in a new window)
Fig. 187, 5. M. borealis Lochman, Mont.-Tex., 5a, exoskel., 5b, cran. profile, both x3 (125).
Synonyms
Meteraspis, Greylockia, Coleopachys
Geographic Distribution
N. Am. (E.Can.-Mont.-Tex.)-S.Am.
Age Range
Beginning Stage in Treatise Usage:
Low.U. Cam.(Dresbach.)
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Low.U. Cam.(Dresbach.)
Ending International Stage:
Paibian
Fraction Up In Ending Stage:
73.3
Ending Date:
494.95
Description
Eyes slightly behind mid-glabellar level, without glabellar furrows, 2 pits in anterior border furrow with rarely a faint 3rd median pit, palpebral furrows deep, without eye ridges, occipital node may be present, fixigenae upsloping, with palpebral area 0.2 to 0.3 or less of glabellar width, posterior area of medium length (tr.). Thorax of 13 segments. Pygidium subquadrate, axis wide, 0.8 to 0.83 of length, with 3 or 4 axial rings, pleurae 3, broad, convex, interpleural grooves and pleural furrows ending at border which widens into base of posterior spines, border furrow lacking
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Crepicephalacea
Family:
Tricrepicephalidea
Formal Genus Name and Reference:
Meteoraspis RESSER, 1935
Type Species:
Ptychoparia? metra WALCOTT, 1890
Images
(Click to enlarge in a new window)
Fig. 187, 5. M. borealis Lochman, Mont.-Tex., 5a, exoskel., 5b, cran. profile, both x3 (125).
Synonyms
Meteraspis, Greylockia, Coleopachys
Geographic Distribution
N. Am. (E.Can.-Mont.-Tex.)-S.Am.
Age Range
Beginning Stage in Treatise Usage:
Low.U. Cam.(Dresbach.)
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Low.U. Cam.(Dresbach.)
Ending International Stage:
Paibian
Fraction Up In Ending Stage:
73.3
Ending Date:
494.95
Description
Eyes slightly behind mid-glabellar level, without glabellar furrows, 2 pits in anterior border furrow with rarely a faint 3rd median pit, palpebral furrows deep, without eye ridges, occipital node may be present, fixigenae upsloping, with palpebral area 0.2 to 0.3 or less of glabellar width, posterior area of medium length (tr.). Thorax of 13 segments. Pygidium subquadrate, axis wide, 0.8 to 0.83 of length, with 3 or 4 axial rings, pleurae 3, broad, convex, interpleural grooves and pleural furrows ending at border which widens into base of posterior spines, border furrow lacking