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Richardsonella
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Remopleuridacea
Family:
Remopleurididae
Formal Genus Name and Reference:
Richardsonella RAYMOND, 1924
Type Species:
Dikelocephalus megalops BILLINGS, 1860
Images
(Click to enlarge in a new window)
Fig. 242, 3. * R. megalops (Billings), Que., 3a, b, cran. (librigena partially reconstr.), pyg., x2.5 (79).
Synonyms
Protapatokephalus
Geographic Distribution
Que., Vt.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Like Kainella but glabella tapering slightly forward, reaching only slightly in front of eye lobes, which are longer (exag.), equalling 0.5 or more of length of cephalon (sag.), with 2 pairs of lateral furrows or none, anterior sections of facial sutures less strongly divergent, posterior sections extending far out, parallel to and just in front of posterior border furrows. Pygidium relatively shorter, pleurae less strongly curved and pleural furrows shallow (188).
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Remopleuridacea
Family:
Remopleurididae
Formal Genus Name and Reference:
Richardsonella RAYMOND, 1924
Type Species:
Dikelocephalus megalops BILLINGS, 1860
Images
(Click to enlarge in a new window)
Fig. 242, 3. * R. megalops (Billings), Que., 3a, b, cran. (librigena partially reconstr.), pyg., x2.5 (79).
Synonyms
Protapatokephalus
Geographic Distribution
Que., Vt.
Age Range
Beginning Stage in Treatise Usage:
Upper Cambrian
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Like Kainella but glabella tapering slightly forward, reaching only slightly in front of eye lobes, which are longer (exag.), equalling 0.5 or more of length of cephalon (sag.), with 2 pairs of lateral furrows or none, anterior sections of facial sutures less strongly divergent, posterior sections extending far out, parallel to and just in front of posterior border furrows. Pygidium relatively shorter, pleurae less strongly curved and pleural furrows shallow (188).