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Dikelokephalina
Classification
Phylum:
Arthropoda
Subphylum:
Trilobitomorpha
Class:
Trilobita
Order:
Ptychopariida
Suborder:
Asaphina
Family:
Dikelokephalinidae
Formal Genus Name and Reference:
Dikelokephalina Brøgger, 1896
Type Species:
Centropletura? dicracura Angelin, 1854, SD VOGDES, 1925
Images
(Click to enlarge in a new window)
Fig. 268, 3c, d. *D. dicraeura (Angelin), Scandinavia, 3c, d, cran., pyg., × 1., Fig. 268, 3a, b. D. asiatica Kobayashi, Korea, 3a, b, cran., pyg., × 1 (419).
Synonyms
Geographic Distribution
W.Eu.-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 convex, tapering, with 3 pairs of deep, slitlike lateral furrows, frontal area 0.3 to 0.5 length of cranidium, eyes of medium size to large, behind center of glabella, fixigenae with palpebral areas slightly more than 0.5 of glabellar width, posterior areas very long (tr.). Pygidium subquadrate, axis convex, narrow, tapered 0.75 or more of length to narrow pointed end, with 7 or 8 axial rings and long terminal, pleural fields twice width of axis, with 7 pleurae separated by backward-curved interpleural grooves, mediumwidth border, posterior margin with short, back-ward-directed spine on each side of median line
References
Museum or Author Information
Classification
Phylum:
Arthropoda
Subphylum:
Trilobitomorpha
Class:
Trilobita
Order:
Ptychopariida
Suborder:
Asaphina
Family:
Dikelokephalinidae
Formal Genus Name and Reference:
Dikelokephalina Brøgger, 1896
Type Species:
Centropletura? dicracura Angelin, 1854, SD VOGDES, 1925
Images
(Click to enlarge in a new window)
Fig. 268, 3c, d. *D. dicraeura (Angelin), Scandinavia, 3c, d, cran., pyg., × 1., Fig. 268, 3a, b. D. asiatica Kobayashi, Korea, 3a, b, cran., pyg., × 1 (419).
Synonyms
Geographic Distribution
W.Eu.-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 convex, tapering, with 3 pairs of deep, slitlike lateral furrows, frontal area 0.3 to 0.5 length of cranidium, eyes of medium size to large, behind center of glabella, fixigenae with palpebral areas slightly more than 0.5 of glabellar width, posterior areas very long (tr.). Pygidium subquadrate, axis convex, narrow, tapered 0.75 or more of length to narrow pointed end, with 7 or 8 axial rings and long terminal, pleural fields twice width of axis, with 7 pleurae separated by backward-curved interpleural grooves, mediumwidth border, posterior margin with short, back-ward-directed spine on each side of median line