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Hemirhodon
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Corynexochida
Superfamily:
Unknown
Family:
Dolichometopidae
Formal Genus Name and Reference:
Hemirhodon RAYMOND, 1937
Type Species:
H. schucherti
Images
(Click to enlarge in a new window)
Fig. 164, 9a. *H. schucherti, Upper Cambrian, Vt., cran. and thoracic segs., x2 (213), Fig. 164, 9b , H. simplex Rasetti, Upper Cambrian, Que., pyg., X3 (193)
Synonyms
Geographic Distribution
N.Am.
Age Range
Beginning Stage in Treatise Usage:
U.M.Cam.
Beginning International Stage:
Drumian
Fraction Up In Beginning Stage:
0
Beginning Date:
504.5
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
Glabella moderately convex, expanding from poorly defined occipital ring, reaching anterior margin, lateral furrows indistinct or effaced, anterior and palpebral areas of fixigenae very narrow, and posterior areas moderately wide, with rapidly tapering lateral extremities, palpebral lobes extremely short, moderately curved. Thoracic axis less than 0.3 of width of thorax, pleurae flat, with shallow furrows, terminating in falcate points. Pygidium about same in size as cephalon, almost flat, with little relief, nearly semicircular, with narrow, rapidly tapering axis of about 6 rings extending to wide, slightly concave border which may have a median marginal notch
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Corynexochida
Superfamily:
Unknown
Family:
Dolichometopidae
Formal Genus Name and Reference:
Hemirhodon RAYMOND, 1937
Type Species:
H. schucherti
Images
(Click to enlarge in a new window)
Fig. 164, 9a. *H. schucherti, Upper Cambrian, Vt., cran. and thoracic segs., x2 (213), Fig. 164, 9b , H. simplex Rasetti, Upper Cambrian, Que., pyg., X3 (193)
Synonyms
Geographic Distribution
N.Am.
Age Range
Beginning Stage in Treatise Usage:
U.M.Cam.
Beginning International Stage:
Drumian
Fraction Up In Beginning Stage:
0
Beginning Date:
504.5
Ending Stage in Treatise Usage:
Upper Cambrian
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
0
Ending Date:
486.85
Description
Glabella moderately convex, expanding from poorly defined occipital ring, reaching anterior margin, lateral furrows indistinct or effaced, anterior and palpebral areas of fixigenae very narrow, and posterior areas moderately wide, with rapidly tapering lateral extremities, palpebral lobes extremely short, moderately curved. Thoracic axis less than 0.3 of width of thorax, pleurae flat, with shallow furrows, terminating in falcate points. Pygidium about same in size as cephalon, almost flat, with little relief, nearly semicircular, with narrow, rapidly tapering axis of about 6 rings extending to wide, slightly concave border which may have a median marginal notch