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Paracenoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Nautilida
Superfamily:
Nautilaceae
Family:
Paracenoceratidae
Formal Genus Name and Reference:
Paracenoceras SPATH, 1927
Type Species:
Nautilus hexagonus SOWERBY, 1826, OD
Images
(Click to enlarge in a new window)
Fig. 333, 4. *P. hexagonum (SOWERBY), U.Jur., Eu.; 4a,b, X0.4 (115).
Synonyms
Geographic Distribution
Eu.-E.Afr.N. Afr.-Asia(Pak.)-W.Indies(Cuba)
Age Range
Beginning Stage in Treatise Usage:
M.Jur.
Beginning International Stage:
Aalenian
Fraction Up In Beginning Stage:
0
Beginning Date:
174.7
Ending Stage in Treatise Usage:
L.Cret.(Alb.)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Robust, involute, smooth, whorl section subtrapezoidal, flanks flattened, convergent toward broad venter that may be flattened, truncate or sulcate; ventral shoulders rounded, umbilicus small, umbilical shoulders rounded, umbilical walls steep, suture with slightly sinuous ventral and lateral lobes, plus small saddle at umbilical shoulders and wall; position of siphuncle variable, siphuncle beaded with short funnels.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Nautilida
Superfamily:
Nautilaceae
Family:
Paracenoceratidae
Formal Genus Name and Reference:
Paracenoceras SPATH, 1927
Type Species:
Nautilus hexagonus SOWERBY, 1826, OD
Images
(Click to enlarge in a new window)
Fig. 333, 4. *P. hexagonum (SOWERBY), U.Jur., Eu.; 4a,b, X0.4 (115).
Synonyms
Geographic Distribution
Eu.-E.Afr.N. Afr.-Asia(Pak.)-W.Indies(Cuba)
Age Range
Beginning Stage in Treatise Usage:
M.Jur.
Beginning International Stage:
Aalenian
Fraction Up In Beginning Stage:
0
Beginning Date:
174.7
Ending Stage in Treatise Usage:
L.Cret.(Alb.)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Robust, involute, smooth, whorl section subtrapezoidal, flanks flattened, convergent toward broad venter that may be flattened, truncate or sulcate; ventral shoulders rounded, umbilicus small, umbilical shoulders rounded, umbilical walls steep, suture with slightly sinuous ventral and lateral lobes, plus small saddle at umbilical shoulders and wall; position of siphuncle variable, siphuncle beaded with short funnels.