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Olenus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Olenacea
Family:
Olenidea
Formal Genus Name and Reference:
Olenus Dalman, 1827
Type Species:
Entomostracites gibbosus WAHLENBERG, 1821, SD ICZN Op. 496
Images
(Click to enlarge in a new window)
Fig. 195, 1a. * O. gibbosus (Wahlenberg), Swed., pyg., x3 (331), Fig. 195, 1b, c. O. truncatus (Brünnich), Swed., 1b, c, exoskel., hypostoma, x4 (331)
Synonyms
Geographic Distribution
N. Eu.-N.Am.-Asia
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
Exoskeleton more or less elongated ovate, Cephalon 0.25 to 0.4 of total length, cranidium subtrapezoidal, glabella subcylindrical or slightly tapering, somewhat truncate in front, with 2 or 3 pairs of oblique lateral furrows, preglabellar field long, fixigenae fairly wide, with acute posterior extremities, eye ridges at right angles to axis or running obliquely forward from anterior corners of glabella, anterior sections of facial sutures slightly convergent between eyes and anterior border, Thorax of 13 to 15 segments, Pygidium small, triangular to semicircular, with narrow raised border, and commonly with a few minute marginal spines
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Ptychopariida
Superfamily:
Olenacea
Family:
Olenidea
Formal Genus Name and Reference:
Olenus Dalman, 1827
Type Species:
Entomostracites gibbosus WAHLENBERG, 1821, SD ICZN Op. 496
Images
(Click to enlarge in a new window)
Fig. 195, 1a. * O. gibbosus (Wahlenberg), Swed., pyg., x3 (331), Fig. 195, 1b, c. O. truncatus (Brünnich), Swed., 1b, c, exoskel., hypostoma, x4 (331)
Synonyms
Geographic Distribution
N. Eu.-N.Am.-Asia
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
Exoskeleton more or less elongated ovate, Cephalon 0.25 to 0.4 of total length, cranidium subtrapezoidal, glabella subcylindrical or slightly tapering, somewhat truncate in front, with 2 or 3 pairs of oblique lateral furrows, preglabellar field long, fixigenae fairly wide, with acute posterior extremities, eye ridges at right angles to axis or running obliquely forward from anterior corners of glabella, anterior sections of facial sutures slightly convergent between eyes and anterior border, Thorax of 13 to 15 segments, Pygidium small, triangular to semicircular, with narrow raised border, and commonly with a few minute marginal spines