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Nodosageceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Prolecanitida
Superfamily:
Medlicottioidea
Family:
Medlicottiidae
Subfamily:
Episageceratinae
Formal Genus Name and Reference:
Nodosageceras RUZHENTSEV, 1956a, p. 161
Type Species:
Episageceras nodosum WANNER, 1932, p. 257, OD
Images
(Click to enlarge in a new window)
Fig. 138, 1a-c. *N. nodosum (WANNER), a-b, × 2, c, diameter approximately 20 mm (Wanner, 1932).-Fig. 138, 1d-e. N.
Synonyms
Geographic Distribution
Indonesia (Timor), Mexico (?La Colorada beds, ?Coahuila)
Age Range
Beginning Stage in Treatise Usage:
Lopingian (Wuchiapingian)
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Lopingian (Wuchiapingian)
Ending International Stage:
Wuchiapingian
Fraction Up In Ending Stage:
100
Ending Date:
254.24
Description
Conch similar to Episageceras, but groove on ventrolateral flank deeper, and with coarse ribs dorsad of groove to midflank. Primary umbilical lobe much broader than adjacent elements and even shorter than in Episageceras, otherwise similar. One species (known from two or three specimens). [See the notation under Episageceras (above) for the affinities of E. aff E. noetlingi.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Prolecanitida
Superfamily:
Medlicottioidea
Family:
Medlicottiidae
Subfamily:
Episageceratinae
Formal Genus Name and Reference:
Nodosageceras RUZHENTSEV, 1956a, p. 161
Type Species:
Episageceras nodosum WANNER, 1932, p. 257, OD
Images
(Click to enlarge in a new window)
Fig. 138, 1a-c. *N. nodosum (WANNER), a-b, × 2, c, diameter approximately 20 mm (Wanner, 1932).-Fig. 138, 1d-e. N.
Synonyms
Geographic Distribution
Indonesia (Timor), Mexico (?La Colorada beds, ?Coahuila)
Age Range
Beginning Stage in Treatise Usage:
Lopingian (Wuchiapingian)
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Lopingian (Wuchiapingian)
Ending International Stage:
Wuchiapingian
Fraction Up In Ending Stage:
100
Ending Date:
254.24
Description
Conch similar to Episageceras, but groove on ventrolateral flank deeper, and with coarse ribs dorsad of groove to midflank. Primary umbilical lobe much broader than adjacent elements and even shorter than in Episageceras, otherwise similar. One species (known from two or three specimens). [See the notation under Episageceras (above) for the affinities of E. aff E. noetlingi.]