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Parakionoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Orthocerataceae
Family:
Orthoceratidae
Subfamily:
Kionoceratinae
Formal Genus Name and Reference:
Parakionoceras FOERSTE, 1928, p. 313
Type Species:
Orthoceras originale BARRANDE, 1868, pl. 267, OD
Images
(Click to enlarge in a new window)
Fig. 159,3. *P. originale (BARRANDE); 3a-e, lat., septal views, long. sec., X0.75 (5)
Synonyms
Geographic Distribution
Eu. (Czech.
Age Range
Beginning Stage in Treatise Usage:
M.Sil.
Beginning International Stage:
Sheinwoodian
Fraction Up In Beginning Stage:
0
Beginning Date:
432.93
Ending Stage in Treatise Usage:
M.Sil.
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
100
Ending Date:
426.74
Description
Faintly curved, uncompressed, exogastric longicones with relatively long camerae and straight transverse sutures. Surface with sharp-edged longitudinal ribs separated by broader concave interspaces. Siphuncle slightly eccentric, empty, necks short, directed obliquely toward siphuncle axis (loxochoanitic), connecting rings somewhat inflated at septal necks, otherwise essentially cylindrical. Cameral deposits well developed.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Orthocerataceae
Family:
Orthoceratidae
Subfamily:
Kionoceratinae
Formal Genus Name and Reference:
Parakionoceras FOERSTE, 1928, p. 313
Type Species:
Orthoceras originale BARRANDE, 1868, pl. 267, OD
Images
(Click to enlarge in a new window)
Fig. 159,3. *P. originale (BARRANDE); 3a-e, lat., septal views, long. sec., X0.75 (5)
Synonyms
Geographic Distribution
Eu. (Czech.
Age Range
Beginning Stage in Treatise Usage:
M.Sil.
Beginning International Stage:
Sheinwoodian
Fraction Up In Beginning Stage:
0
Beginning Date:
432.93
Ending Stage in Treatise Usage:
M.Sil.
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
100
Ending Date:
426.74
Description
Faintly curved, uncompressed, exogastric longicones with relatively long camerae and straight transverse sutures. Surface with sharp-edged longitudinal ribs separated by broader concave interspaces. Siphuncle slightly eccentric, empty, necks short, directed obliquely toward siphuncle axis (loxochoanitic), connecting rings somewhat inflated at septal necks, otherwise essentially cylindrical. Cameral deposits well developed.