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Maryvillia
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Asaphiscacea
Family:
Asaphiscidae
Formal Genus Name and Reference:
Maryvillia WALCOTT, 1916
Type Species:
M. arion
Images
(Click to enlarge in a new window)
Fig. 216, 1a, b. *M. arion, Tenn., 1a, b, cran., pyg., x4 (488), Fig. 216, Ic-g. M. eleanora (Lochman), Mont., 1c, d, cran., dorsal, profile, 1e, librigena, 1 f, g, pyg., dorsal, profile, all x4 (425)
Synonyms
Protillaenus, Blountina, Blountiana
Geographic Distribution
Upper Cambrian(Dresbach.), N.Am.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian(Dresbach.)
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian(Dresbach.)
Ending International Stage:
Paibian
Fraction Up In Ending Stage:
73.3
Ending Date:
494.95
Description
"Glabella broad, low, sides nearly parallel, front broadly rounded, all furrows except occipital and posterior border obsolete on exterior, anterior border furrow also obsolete on interior, others faint, librigenae with short blunt genal spine. Pygidium convex, with nearly vertical border, long tapered axis may extend beyond border furrow, with 7 to 12 axial rings, only faint axial furrow on exterior, all furrows present on interior."
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Asaphiscacea
Family:
Asaphiscidae
Formal Genus Name and Reference:
Maryvillia WALCOTT, 1916
Type Species:
M. arion
Images
(Click to enlarge in a new window)
Fig. 216, 1a, b. *M. arion, Tenn., 1a, b, cran., pyg., x4 (488), Fig. 216, Ic-g. M. eleanora (Lochman), Mont., 1c, d, cran., dorsal, profile, 1e, librigena, 1 f, g, pyg., dorsal, profile, all x4 (425)
Synonyms
Protillaenus, Blountina, Blountiana
Geographic Distribution
Upper Cambrian(Dresbach.), N.Am.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian(Dresbach.)
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian(Dresbach.)
Ending International Stage:
Paibian
Fraction Up In Ending Stage:
73.3
Ending Date:
494.95
Description
"Glabella broad, low, sides nearly parallel, front broadly rounded, all furrows except occipital and posterior border obsolete on exterior, anterior border furrow also obsolete on interior, others faint, librigenae with short blunt genal spine. Pygidium convex, with nearly vertical border, long tapered axis may extend beyond border furrow, with 7 to 12 axial rings, only faint axial furrow on exterior, all furrows present on interior."