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Leiobienvillia
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Olenacea
Family:
Olenidea
Formal Genus Name and Reference:
Leiobienvillia RASETTI, 1954
Type Species:
L. laevigata
Images
(Click to enlarge in a new window)
Fig. 197, 7. *L. laevigata, Newf., cran., x6 (445n).
Synonyms
Geographic Distribution
NE.N.Am.
Age Range
Beginning Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Cranidium uniformly convex, all furrows obsolete abaxially but adaxially with very shallow axial, occipital, and posterior border furrows, glabella low, broad, subquadrate, length about 0.8 of cranidium, with 3 pairs of shallow arcuate lateral furrows, short, convex undifferentiated frontal area, eyes small, opposite anterior third of glabella, fixigenae downsloping, with palpebral areas about 0.5 of glabellar width, posterior areas triangular, broad, medium in length (tr.), librigenae and pygidium unknown. Surface smooth. L.Ord.(Tremadoc.), NE.N.Am.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Olenacea
Family:
Olenidea
Formal Genus Name and Reference:
Leiobienvillia RASETTI, 1954
Type Species:
L. laevigata
Images
(Click to enlarge in a new window)
Fig. 197, 7. *L. laevigata, Newf., cran., x6 (445n).
Synonyms
Geographic Distribution
NE.N.Am.
Age Range
Beginning Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.(Tremadoc.)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Cranidium uniformly convex, all furrows obsolete abaxially but adaxially with very shallow axial, occipital, and posterior border furrows, glabella low, broad, subquadrate, length about 0.8 of cranidium, with 3 pairs of shallow arcuate lateral furrows, short, convex undifferentiated frontal area, eyes small, opposite anterior third of glabella, fixigenae downsloping, with palpebral areas about 0.5 of glabellar width, posterior areas triangular, broad, medium in length (tr.), librigenae and pygidium unknown. Surface smooth. L.Ord.(Tremadoc.), NE.N.Am.