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Calodiscus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Eodiscoidea
Family:
Calodiscidae
Formal Genus Name and Reference:
Calodiscus Howell, 1935b, p. 224, nom. nov. pro Goniodiscus Raymond, 1913b, p. 101, non Müller \\& TROSCHEL, 1842
Type Species:
Agnostus lobatus Hall, 1847, p. 258, OD, syntypes (RASETTI, 1952a, pl. 51, fig. 8-11), 210, AMNH, New York
Images
(Click to enlarge in a new window)
Fig . 245,4a,b. *C. lobatus (HALL), Botomian (West Castleton Formation), New York (Troy); a, syntype, cephalon, ×12; b, syntype, pygidium, ×12 (Rasetti, 1952a).
Synonyms
Brevidiscus
Geographic Distribution
Sweden, England, Germany, Morocco, Siberia (Mt. Altay), USA (Massachusetts, New York, Alaska), Canada (Newfoundland), Greenland.
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale) (Atdabanian, Botomian)
Beginning International Stage:
Cambrian Stage 3
Fraction Up In Beginning Stage:
0
Beginning Date:
521
Ending Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale) (Atdabanian, Botomian)
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
0
Ending Date:
513.13
Description
Glabella parallel sided, with two, shallow transglabellar furrows, glabellar anterior reaching border furrow, border narrow laterally, smooth or with a few tubercles laterally, eyes and facial sutures absent. Pygidial axis of few rings (four or five), wide, reaching border furrow or close to it, border narrow, with smooth or serrated margin. Lower Cambrian (Atdabanian, Botomian): Sweden, England, Germany, Morocco, Siberia (Mt. Altay), USA (Massachusetts, New York, Alaska), Canada (Newfoundland), Greenland.
References
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Eodiscoidea
Family:
Calodiscidae
Formal Genus Name and Reference:
Calodiscus Howell, 1935b, p. 224, nom. nov. pro Goniodiscus Raymond, 1913b, p. 101, non Müller \\& TROSCHEL, 1842
Type Species:
Agnostus lobatus Hall, 1847, p. 258, OD, syntypes (RASETTI, 1952a, pl. 51, fig. 8-11), 210, AMNH, New York
Images
(Click to enlarge in a new window)
Fig . 245,4a,b. *C. lobatus (HALL), Botomian (West Castleton Formation), New York (Troy); a, syntype, cephalon, ×12; b, syntype, pygidium, ×12 (Rasetti, 1952a).
Synonyms
Brevidiscus
Geographic Distribution
Sweden, England, Germany, Morocco, Siberia (Mt. Altay), USA (Massachusetts, New York, Alaska), Canada (Newfoundland), Greenland.
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale) (Atdabanian, Botomian)
Beginning International Stage:
Cambrian Stage 3
Fraction Up In Beginning Stage:
0
Beginning Date:
521
Ending Stage in Treatise Usage:
Lower Cambrian (“Lower Cambrian” in Trilobite volume of Treatise = current Cambrian Epoch 2 of international scale) (Atdabanian, Botomian)
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
0
Ending Date:
513.13
Description
Glabella parallel sided, with two, shallow transglabellar furrows, glabellar anterior reaching border furrow, border narrow laterally, smooth or with a few tubercles laterally, eyes and facial sutures absent. Pygidial axis of few rings (four or five), wide, reaching border furrow or close to it, border narrow, with smooth or serrated margin. Lower Cambrian (Atdabanian, Botomian): Sweden, England, Germany, Morocco, Siberia (Mt. Altay), USA (Massachusetts, New York, Alaska), Canada (Newfoundland), Greenland.