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Allanoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Orthocerida
Superfamily:
Pseudorthocerataceae
Family:
Pseudorthoceratidae
Subfamily:
Spyroceratinae
Formal Genus Name and Reference:
Allanoceras BARSKOV, 1959, p. 57
Type Species:
A. inusitatum, OD
Images
(Click to enlarge in a new window)
Fig. 174, 2. *A. inusitatum, 2a,b, long. sec., lat. view, × 1 (6).
Synonyms
Geographic Distribution
USSR (S.Ferghana = N.Tajikistan?)
Age Range
Beginning Stage in Treatise Usage:
U.Sil.
Beginning International Stage:
Gorstian
Fraction Up In Beginning Stage:
0
Beginning Date:
426.74
Ending Stage in Treatise Usage:
U.Sil.
Ending International Stage:
Pridoli
Fraction Up In Ending Stage:
100
Ending Date:
419
Description
Uncompressed smooth-surfaced orthocones, Siphuncle between center and venter, suborthochoanitic, with brims not developed, segments expanding only slightly within camerae, Annulosiphonate endosiphuncular deposits growing forward dorsally to form continuous lining of uniform thickness, ventrally, deposits inflated in adapical part of segment, but thinner in forward part of segment, Episeptal, hyposeptal, and mural deposits in camerae
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:
Allanoceras BARSKOV, 1959, p. 57
Type Species:
A. inusitatum, OD
Images
(Click to enlarge in a new window)
Fig. 174, 2. *A. inusitatum, 2a,b, long. sec., lat. view, × 1 (6).
Synonyms
Geographic Distribution
USSR (S.Ferghana = N.Tajikistan?)
Age Range
Beginning Stage in Treatise Usage:
U.Sil.
Beginning International Stage:
Gorstian
Fraction Up In Beginning Stage:
0
Beginning Date:
426.74
Ending Stage in Treatise Usage:
U.Sil.
Ending International Stage:
Pridoli
Fraction Up In Ending Stage:
100
Ending Date:
419
Description
Uncompressed smooth-surfaced orthocones, Siphuncle between center and venter, suborthochoanitic, with brims not developed, segments expanding only slightly within camerae, Annulosiphonate endosiphuncular deposits growing forward dorsally to form continuous lining of uniform thickness, ventrally, deposits inflated in adapical part of segment, but thinner in forward part of segment, Episeptal, hyposeptal, and mural deposits in camerae