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Protocycloceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Ellesmerocerida
Family:
Protocycloceratidae
Formal Genus Name and Reference:
Protocycloceras Hyatt in ZITTEL, 1900, p. 518
Type Species:
Orthoceras Lamarcki BILLINGS, 1859, p. 362, OD
Images
(Click to enlarge in a new window)
Fig. 86, 1a, c. *P. lamarcki (Billings), L.Ord. (U.Canad.), Can. (Ont.-Newf.), x1.5 (204).-Fig. 86, 1b. P. whitfieldi Ruedemann, L.Ord. (U.Canad.), USA (Vt.), x1.5 (204).
Synonyms
Orotocycloceras, Dresseroceras
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
L.Ord. (L.Canad.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord. (U.Canad.)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Strongly annulate orthocones with circular cross section, annulations and sutures directly transverse and essentially straight, siphuncle approximately 0.3 of corresponding conch diameter, ventral but not marginal, septal necks probably orthochoanitic, siphuncular segments tubular
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Ellesmerocerida
Family:
Protocycloceratidae
Formal Genus Name and Reference:
Protocycloceras Hyatt in ZITTEL, 1900, p. 518
Type Species:
Orthoceras Lamarcki BILLINGS, 1859, p. 362, OD
Images
(Click to enlarge in a new window)
Fig. 86, 1a, c. *P. lamarcki (Billings), L.Ord. (U.Canad.), Can. (Ont.-Newf.), x1.5 (204).-Fig. 86, 1b. P. whitfieldi Ruedemann, L.Ord. (U.Canad.), USA (Vt.), x1.5 (204).
Synonyms
Orotocycloceras, Dresseroceras
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
L.Ord. (L.Canad.)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord. (U.Canad.)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Strongly annulate orthocones with circular cross section, annulations and sutures directly transverse and essentially straight, siphuncle approximately 0.3 of corresponding conch diameter, ventral but not marginal, septal necks probably orthochoanitic, siphuncular segments tubular