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Palmeroceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Pseudorthocerataceae
Family:
Pseudorthoceratidae
Subfamily:
Spyroceratinae
Formal Genus Name and Reference:
Palmeroceras FLOWER, 1936, p. 58
Type Species:
Orthoceras fustis HALL, 1879, p. 281, OD
Images
(Click to enlarge in a new window)
Fig. 176,3. *P. fustis (HALL); 3a,b, lat., septal views, X0.5 (22).
Synonyms
Geographic Distribution
USA (N.Y.)
Age Range
Beginning Stage in Treatise Usage:
M.Dev.
Beginning International Stage:
Eifelian
Fraction Up In Beginning Stage:
0
Beginning Date:
394.3
Ending Stage in Treatise Usage:
M.Dev.
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Orthocones with straight transverse sutures and circular cross section, shell surface with fine cancellate markings, aperture trilobate, body chamber with series of internal constrictions, siphuncle central, cyrtochoanitic, brim width nearly twice neck length, width of adnation area nearly equals that of brim, free part of connecting ring abruptly curved at anterior and posterior ends, slightly convex over mid-portion, endosiphuncular and cameral deposits unknown
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Pseudorthocerataceae
Family:
Pseudorthoceratidae
Subfamily:
Spyroceratinae
Formal Genus Name and Reference:
Palmeroceras FLOWER, 1936, p. 58
Type Species:
Orthoceras fustis HALL, 1879, p. 281, OD
Images
(Click to enlarge in a new window)
Fig. 176,3. *P. fustis (HALL); 3a,b, lat., septal views, X0.5 (22).
Synonyms
Geographic Distribution
USA (N.Y.)
Age Range
Beginning Stage in Treatise Usage:
M.Dev.
Beginning International Stage:
Eifelian
Fraction Up In Beginning Stage:
0
Beginning Date:
394.3
Ending Stage in Treatise Usage:
M.Dev.
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Orthocones with straight transverse sutures and circular cross section, shell surface with fine cancellate markings, aperture trilobate, body chamber with series of internal constrictions, siphuncle central, cyrtochoanitic, brim width nearly twice neck length, width of adnation area nearly equals that of brim, free part of connecting ring abruptly curved at anterior and posterior ends, slightly convex over mid-portion, endosiphuncular and cameral deposits unknown