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Oryctocephalus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Corynexochida
Superfamily:
Unknown
Family:
Oryctocephalidae
Formal Genus Name and Reference:
Oryctocephalus WALCOTT, 1886
Type Species:
O. primus
Images
(Click to enlarge in a new window)
Fig. 162, 1. * O. primus, Nev., 1 a, b, cran., pyg., × 2 (448n), Fig. 161. O. burgessensis Resser, W. Can.(B.C.), exoskel., × 2 (448n), Fig. 162, 2.
Synonyms
Geographic Distribution
Eu.-Asia-N.Am.-S.Am.
Age Range
Beginning Stage in Treatise Usage:
M.Cam.
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
512.3
Ending Stage in Treatise Usage:
M.Cam.
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Glabella parallel-sided or slightly expanded forward, glabellar furrows well impressed as pits, palpebral lobes 0.3 of glabellar length, distant from glabella, posterior to glabellar mid-point, posterior areas of fixigenae not extending much beyond palpebral lobes, genal spines long, Thorax with 7 segments, pleurae extended into spines, Pygidium almost as large as cephalon, axis tapered, with 5 to 7 segments, pleural furrows and grooves impressed, not parallel to each other, 5 or 6 pairs of marginal spines, 4th pair strongest in most species
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Corynexochida
Superfamily:
Unknown
Family:
Oryctocephalidae
Formal Genus Name and Reference:
Oryctocephalus WALCOTT, 1886
Type Species:
O. primus
Images
(Click to enlarge in a new window)
Fig. 162, 1. * O. primus, Nev., 1 a, b, cran., pyg., × 2 (448n), Fig. 161. O. burgessensis Resser, W. Can.(B.C.), exoskel., × 2 (448n), Fig. 162, 2.
Synonyms
Geographic Distribution
Eu.-Asia-N.Am.-S.Am.
Age Range
Beginning Stage in Treatise Usage:
M.Cam.
Beginning International Stage:
Cambrian Stage 4
Fraction Up In Beginning Stage:
0
Beginning Date:
512.3
Ending Stage in Treatise Usage:
M.Cam.
Ending International Stage:
Guzhangian
Fraction Up In Ending Stage:
0
Ending Date:
498.75
Description
Glabella parallel-sided or slightly expanded forward, glabellar furrows well impressed as pits, palpebral lobes 0.3 of glabellar length, distant from glabella, posterior to glabellar mid-point, posterior areas of fixigenae not extending much beyond palpebral lobes, genal spines long, Thorax with 7 segments, pleurae extended into spines, Pygidium almost as large as cephalon, axis tapered, with 5 to 7 segments, pleural furrows and grooves impressed, not parallel to each other, 5 or 6 pairs of marginal spines, 4th pair strongest in most species