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Dactylocephalus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Dikelokephalinidae
Formal Genus Name and Reference:
Dactylocephalus HSÜ, 1948
Type Species:
D. dactyloides
Images
(Click to enlarge in a new window)
Fig. 268, 1. *D. dactyloides, Tremadoc., China(W.Hupeh), la, b, ceph., pyg., x1 (419).
Synonyms
Geographic Distribution
E.Asia
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
Glabella moderately convex, tapering, front narrow rounded, with 2 pairs of arcuate lateral furrows, eyes large, opposite posterior 0.3 of glabella, frontal area about 0.25 of length (sag.) of cranidium, with very shallow anterior furrow near front, fixigenae with palpebral areas about 0.7 of glabellar width, posterior areas narrow (exsag. ), same in length (tr.) as occipital ring, posterior border furrow nearly obsolete, librigenae with shallow lateral border furrow anteriorly and long slender genal spines. Pygidium subquadrate, axis convex, medium-width, tapered 0.8 of length to narrow rounded end, with 6 axial rings and terminal, pleural fields about same in width as axis, sloping into very narrow border, with 6 pleurae separated by backward-curved interpleural grooves running nearly to margin, short backward-directed spine on each side of median line. Concentric wrinkles on cephalon.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Uncertain
Family:
Dikelokephalinidae
Formal Genus Name and Reference:
Dactylocephalus HSÜ, 1948
Type Species:
D. dactyloides
Images
(Click to enlarge in a new window)
Fig. 268, 1. *D. dactyloides, Tremadoc., China(W.Hupeh), la, b, ceph., pyg., x1 (419).
Synonyms
Geographic Distribution
E.Asia
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
Glabella moderately convex, tapering, front narrow rounded, with 2 pairs of arcuate lateral furrows, eyes large, opposite posterior 0.3 of glabella, frontal area about 0.25 of length (sag.) of cranidium, with very shallow anterior furrow near front, fixigenae with palpebral areas about 0.7 of glabellar width, posterior areas narrow (exsag. ), same in length (tr.) as occipital ring, posterior border furrow nearly obsolete, librigenae with shallow lateral border furrow anteriorly and long slender genal spines. Pygidium subquadrate, axis convex, medium-width, tapered 0.8 of length to narrow rounded end, with 6 axial rings and terminal, pleural fields about same in width as axis, sloping into very narrow border, with 6 pleurae separated by backward-curved interpleural grooves running nearly to margin, short backward-directed spine on each side of median line. Concentric wrinkles on cephalon.