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Demarezites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Cycloloboidea
Family:
Cyclolobidae
Formal Genus Name and Reference:
Demarezites RUZHENTSEV, 1955a, p. 703
Type Species:
Waagenoceras oyensi GERTH, 1950, p. 250, OD
Images
(Click to enlarge in a new window)
Fig. 96, 2a-c. *D. oyensi (Gerth), lectotype, GIUA-E229, Tae Wei beds, ?Roadian, Timor, a-b, X 0.5, c, diameter ranging 50-55 mm (Glenister & Furnish, 1987).
Synonyms
Geographic Distribution
Indonesia (Timor), Mexico (Coahuila), USA (western Texas, Idaho), Canada (?British Columbia)
Age Range
Beginning Stage in Treatise Usage:
Guadalupian (Roadian)
Beginning International Stage:
Roadian
Fraction Up In Beginning Stage:
0
Beginning Date:
274.37
Ending Stage in Treatise Usage:
Guadalupian (Wordian)
Ending International Stage:
Wordian
Fraction Up In Ending Stage:
100
Ending Date:
264.34
Description
Smooth, globose (W/D, 0.9–1.0) ancestral cyclolobins. Characterized by 7 pairs of moderately denticulate external lobes to umbilical shoulders, the 5–6 lobe pairs being incompletely isolated, even at 50 mm phragmocone diameter. Prongs of ventral lobe (V1 ) have ventral flanks that are weakly sinuous rather than denticulate. Six or seven species (only three described). [This genus is probably derived from the kufengoceratin genus Tongluceras z hao & zheng, from which it differs by its larger size, more strongly arched sutural trace, and possession of seven rather than five pairs of denticulate external lobes.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Cycloloboidea
Family:
Cyclolobidae
Formal Genus Name and Reference:
Demarezites RUZHENTSEV, 1955a, p. 703
Type Species:
Waagenoceras oyensi GERTH, 1950, p. 250, OD
Images
(Click to enlarge in a new window)
Fig. 96, 2a-c. *D. oyensi (Gerth), lectotype, GIUA-E229, Tae Wei beds, ?Roadian, Timor, a-b, X 0.5, c, diameter ranging 50-55 mm (Glenister & Furnish, 1987).
Synonyms
Geographic Distribution
Indonesia (Timor), Mexico (Coahuila), USA (western Texas, Idaho), Canada (?British Columbia)
Age Range
Beginning Stage in Treatise Usage:
Guadalupian (Roadian)
Beginning International Stage:
Roadian
Fraction Up In Beginning Stage:
0
Beginning Date:
274.37
Ending Stage in Treatise Usage:
Guadalupian (Wordian)
Ending International Stage:
Wordian
Fraction Up In Ending Stage:
100
Ending Date:
264.34
Description
Smooth, globose (W/D, 0.9–1.0) ancestral cyclolobins. Characterized by 7 pairs of moderately denticulate external lobes to umbilical shoulders, the 5–6 lobe pairs being incompletely isolated, even at 50 mm phragmocone diameter. Prongs of ventral lobe (V1 ) have ventral flanks that are weakly sinuous rather than denticulate. Six or seven species (only three described). [This genus is probably derived from the kufengoceratin genus Tongluceras z hao & zheng, from which it differs by its larger size, more strongly arched sutural trace, and possession of seven rather than five pairs of denticulate external lobes.]