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Harrisoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Orthocerataceae
Family:
Geisonoceratidae
Formal Genus Name and Reference:
Harrisoceras FLOWER, 1939, p. 475
Type Species:
H. orthoceroides, OD
Images
(Click to enlarge in a new window)
Fig. 169, 8. *H. orthoceroides, M.Sil., USA (Ind. ), long. sec., x2.5 (23)
Synonyms
Geographic Distribution
Eu. (Est.), M.Sil., N. Am. (Ill.-Ind.-E.Can.)-Eu. (Czech.)-Sib.
Age Range
Beginning Stage in Treatise Usage:
M.Ord., M.Sil.
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
M.Ord., M.Sil.
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
100
Ending Date:
458.18
Description
Circular or slightly depressed orthocones with straight transverse sutures and moderate to deep camerae, Surface smooth, even growth lines unknown, Siphuncle generally large, orthochoanitic, with central tube and annulosiphonate deposits in form of simple annuli in septal foramen which may constrict mature siphuncle interior to 0.3 of its width, Deposits developed against necks, never against rings, Cameral deposits episeptal and hyposeptal, never massive, Mature body chamber with internal thickening just before aperture
References
Flower, R. H., 1939, Study of the Pseudorthoceratidae: Palaeont. Americana, v. 2, no. 10, 214 p., 9 pl., 22 fig.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Orthocerataceae
Family:
Geisonoceratidae
Formal Genus Name and Reference:
Harrisoceras FLOWER, 1939, p. 475
Type Species:
H. orthoceroides, OD
Images
(Click to enlarge in a new window)
Fig. 169, 8. *H. orthoceroides, M.Sil., USA (Ind. ), long. sec., x2.5 (23)
Synonyms
Geographic Distribution
Eu. (Est.), M.Sil., N. Am. (Ill.-Ind.-E.Can.)-Eu. (Czech.)-Sib.
Age Range
Beginning Stage in Treatise Usage:
M.Ord., M.Sil.
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
M.Ord., M.Sil.
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
100
Ending Date:
458.18
Description
Circular or slightly depressed orthocones with straight transverse sutures and moderate to deep camerae, Surface smooth, even growth lines unknown, Siphuncle generally large, orthochoanitic, with central tube and annulosiphonate deposits in form of simple annuli in septal foramen which may constrict mature siphuncle interior to 0.3 of its width, Deposits developed against necks, never against rings, Cameral deposits episeptal and hyposeptal, never massive, Mature body chamber with internal thickening just before aperture
References
Flower, R. H., 1939, Study of the Pseudorthoceratidae: Palaeont. Americana, v. 2, no. 10, 214 p., 9 pl., 22 fig.