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Bollandites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Pericycloidea
Family:
Maxigoniatitidae
Formal Genus Name and Reference:
Bollandites BISAT, 1952, p. 164
Type Species:
Beyrichoceratoides castletonensis BISAT, 1924, p. 92, OD
Images
(Click to enlarge in a new window)
—Fig. 22, 3a-b. *B. castletonensis (Bisat), upper Visean, upper Beyrichoceras Zone, England, a, Cracoe Reef Limestone, Elbolton, BGS 53584, X 3 (Bisat, 1934), b, suture, diameter at 20 mm , Treak Cliff, Castleton, X 3.6 (Bisat, 1924)."
Synonyms
Geographic Distribution
Belgium, Germany, England, Wales, Ireland, Portugal, Algeria, Poland, Russia (North Urals), Ukraine, China (Yunnan), Australia (New South Wales, Queensland), USA (Alaska)
Age Range
Beginning Stage in Treatise Usage:
Mississippian (Tournaisian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Mississippian (Visean)
Ending International Stage:
Visean
Fraction Up In Ending Stage:
100
Ending Date:
330.34
Description
Conch form discoidal to thickly discoidal, umbilicus moderately wide to narrow. Ornamentation consisting of noncrenulate biconvex transverse striae, relatively strong in some species. Constrictions and ventral grove may be present, no spiral ornamentation. Ventral lobe with very low median saddle and rather narrow, at its base as in Muensteroceras, sides subparallel in apicad half, diverging orad. Tips of branches of ventral lobe not diverging. First lateral saddle broadly rounded. Adventitious lobe symmetrical and wide, with more or less sinuous sides including a broad angle, lying almost in line with basis of ventral lobe.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Pericycloidea
Family:
Maxigoniatitidae
Formal Genus Name and Reference:
Bollandites BISAT, 1952, p. 164
Type Species:
Beyrichoceratoides castletonensis BISAT, 1924, p. 92, OD
Images
(Click to enlarge in a new window)
—Fig. 22, 3a-b. *B. castletonensis (Bisat), upper Visean, upper Beyrichoceras Zone, England, a, Cracoe Reef Limestone, Elbolton, BGS 53584, X 3 (Bisat, 1934), b, suture, diameter at 20 mm , Treak Cliff, Castleton, X 3.6 (Bisat, 1924)."
Synonyms
Geographic Distribution
Belgium, Germany, England, Wales, Ireland, Portugal, Algeria, Poland, Russia (North Urals), Ukraine, China (Yunnan), Australia (New South Wales, Queensland), USA (Alaska)
Age Range
Beginning Stage in Treatise Usage:
Mississippian (Tournaisian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Mississippian (Visean)
Ending International Stage:
Visean
Fraction Up In Ending Stage:
100
Ending Date:
330.34
Description
Conch form discoidal to thickly discoidal, umbilicus moderately wide to narrow. Ornamentation consisting of noncrenulate biconvex transverse striae, relatively strong in some species. Constrictions and ventral grove may be present, no spiral ornamentation. Ventral lobe with very low median saddle and rather narrow, at its base as in Muensteroceras, sides subparallel in apicad half, diverging orad. Tips of branches of ventral lobe not diverging. First lateral saddle broadly rounded. Adventitious lobe symmetrical and wide, with more or less sinuous sides including a broad angle, lying almost in line with basis of ventral lobe.