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Bollandoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Pericycloidea
Family:
Maxigoniatitidae
Formal Genus Name and Reference:
Bollandoceras BISAT, 1952, p. 164
Type Species:
Beyrichoceras submicronotum BISAT, 1934, p. 291, OD, =Goniatites micronotus PHILLIPS, 1836, p. 234, subj.
Images
(Click to enlarge in a new window)
Fig. 22,2a. B. micronotoide (B isat ), Grassington, England, upper Visean, upper Beyrichoceras Zone, BGS 53531, ×3 (Bisat, 1934).- Fig . 22,2b. B. hodderense (B isat ), Ashnott, Crag Beck, England, upper Visean, upper Beyrichoceras Zone, BGS Ro5190, suture, whorl height at 12.2 mm, whorl width 13.6 mm, reversed, magnification not stated (Riley, 1996).
Synonyms
Geographic Distribution
Germany, Russia (North Urals), China (Yunnan), Belgium, Great Britain, Ireland, Morocco, Algeria, Ukraine, Kazakhstan (Karaganda), Kyrgyzstan (Tian Shan), Mongolia, Australia (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 narrow to punctiform. Ornamentation consisting of noncrenulate biconvex transverse striae, no spirals. Constrictions present in most species. Ventral lobe rather narrow at its base, with low median saddle. Sides of ventral lobe subparallel at the base as in Beyrichoceras, but diverging orad with wide angle, first lateral saddle rounded to spatulate. Adventitious lobe moderately wide and sometimes with small basal nipple.
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:
Bollandoceras BISAT, 1952, p. 164
Type Species:
Beyrichoceras submicronotum BISAT, 1934, p. 291, OD, =Goniatites micronotus PHILLIPS, 1836, p. 234, subj.
Images
(Click to enlarge in a new window)
Fig. 22,2a. B. micronotoide (B isat ), Grassington, England, upper Visean, upper Beyrichoceras Zone, BGS 53531, ×3 (Bisat, 1934).- Fig . 22,2b. B. hodderense (B isat ), Ashnott, Crag Beck, England, upper Visean, upper Beyrichoceras Zone, BGS Ro5190, suture, whorl height at 12.2 mm, whorl width 13.6 mm, reversed, magnification not stated (Riley, 1996).
Synonyms
Geographic Distribution
Germany, Russia (North Urals), China (Yunnan), Belgium, Great Britain, Ireland, Morocco, Algeria, Ukraine, Kazakhstan (Karaganda), Kyrgyzstan (Tian Shan), Mongolia, Australia (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 narrow to punctiform. Ornamentation consisting of noncrenulate biconvex transverse striae, no spirals. Constrictions present in most species. Ventral lobe rather narrow at its base, with low median saddle. Sides of ventral lobe subparallel at the base as in Beyrichoceras, but diverging orad with wide angle, first lateral saddle rounded to spatulate. Adventitious lobe moderately wide and sometimes with small basal nipple.