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Cyclolobus
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Cycloloboidea
Family:
Cyclolobidae
Formal Genus Name and Reference:
Cyclolobus WAAGEN, 1879, p. 21
Type Species:
Phylloceras Oldhami WAAGEN, 1872, p. 353, OD
Images
(Click to enlarge in a new window)
Fig. 95a. *C. oldhami (Waagen), Chhidru Formation, Lopingian, Salt Range, Pakistan, diameter at 125 mm (Furnish, 1966), Fig. 95b-g. C. walkeri Diener, b-f, Ambilobé beds, Ankitohazo, northern Madagascar, × 0.75, g. Chhidru Formation, Lopingian, Salt Range, Pakistan, diameter approximately 50 mm (Furnish & Glenister, 1970)
Synonyms
Krafftoceras; Godthaabites; Procycloceras
Geographic Distribution
Pakistan (Salt Range), India (Kashmir, Himalaya), China (southern Xizang), Japan (Kitakami), Russia (Maritime Territory), Armenia (?Vedi River), Indonesia (Timor), Western Australia, Madagascar, USA (California), Greenland
Age Range
Beginning Stage in Treatise Usage:
Lopingian (Wuchiapingian)
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Lopingian (Changhsingian)
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Conch commonly 10-20 cm diameter at maturity, compressed, with narrow umbilicus (U/D, 0.1-0.2), Growth lines biconvex, ribs and constrictions conspicuous in juveniles, generally absent in large specimens, Mature modifications comprise slight geniculation and formation of deep subterminal constriction with accentuated ocular and hyponomic sinuses, All sutural elements strongly denticulate, genus characterized by tertiary subdivision near crest of first external lateral saddle, Prongs of ventral lobe wide, 9 to 12 pairs of subequal external lateral lobes diminish in size to umbilical shoulders, sutural trace is strongly arched
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Cycloloboidea
Family:
Cyclolobidae
Formal Genus Name and Reference:
Cyclolobus WAAGEN, 1879, p. 21
Type Species:
Phylloceras Oldhami WAAGEN, 1872, p. 353, OD
Images
(Click to enlarge in a new window)
Fig. 95a. *C. oldhami (Waagen), Chhidru Formation, Lopingian, Salt Range, Pakistan, diameter at 125 mm (Furnish, 1966), Fig. 95b-g. C. walkeri Diener, b-f, Ambilobé beds, Ankitohazo, northern Madagascar, × 0.75, g. Chhidru Formation, Lopingian, Salt Range, Pakistan, diameter approximately 50 mm (Furnish & Glenister, 1970)
Synonyms
Krafftoceras; Godthaabites; Procycloceras
Geographic Distribution
Pakistan (Salt Range), India (Kashmir, Himalaya), China (southern Xizang), Japan (Kitakami), Russia (Maritime Territory), Armenia (?Vedi River), Indonesia (Timor), Western Australia, Madagascar, USA (California), Greenland
Age Range
Beginning Stage in Treatise Usage:
Lopingian (Wuchiapingian)
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Lopingian (Changhsingian)
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Conch commonly 10-20 cm diameter at maturity, compressed, with narrow umbilicus (U/D, 0.1-0.2), Growth lines biconvex, ribs and constrictions conspicuous in juveniles, generally absent in large specimens, Mature modifications comprise slight geniculation and formation of deep subterminal constriction with accentuated ocular and hyponomic sinuses, All sutural elements strongly denticulate, genus characterized by tertiary subdivision near crest of first external lateral saddle, Prongs of ventral lobe wide, 9 to 12 pairs of subequal external lateral lobes diminish in size to umbilical shoulders, sutural trace is strongly arched