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Homoceratoides
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Neodimorphoceratoidea
Family:
Ramositidae
Formal Genus Name and Reference:
Homoceratoides BISAT, 1924, p. 112
Type Species:
H. prereticulatus, OD
Images
(Click to enlarge in a new window)
Fig. 43, 3a. *H. prereticulatus, Holden Gill, Silsden, Airedale, Yorkshire, England, Kinderscoutian, X 4 (Bisat, 1924), Fig. 43, 3b-e. H. varicatus (Schmidt), juvenile forms, Neheim, Emde brickworks, Rhenish Massif, Germany, Kinderscoutian, b-c, GPIT 1492/1833, X 8, d-e, GPIT 1492 / 1834, X 5 (Kullmann, new), Fig. 43, 3f. H. librovitchi Ruzhentsev & Bogoslovskaia, holotype, suture, Schartym River, South Urals, Russia, Kinderscoutian, lower Bashkirian, PIN 455/40472, whorl height at 12.8 mm , whorl width 12.6 mm , X 2.5 (Ruzhentsev & Bogoslovskaia, 1978)
Synonyms
Geographic Distribution
Great Britain, Ireland, Belgium, Netherlands, Germany, Poland, Russia (South Urals), Ukraine (Donets), Portugal, Morocco, China (Guizhou, Xinjiang), Uzbekistan (Fergana)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (Bashkirian Kinderscoutian-Yeadonian)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
Pennsylvanian (Bashkirian Kinderscoutian-Yeadonian)
Ending International Stage:
Bashkirian
Fraction Up In Ending Stage:
56.3
Ending Date:
318.76
Description
Conch form as in Homoceras, Sculpture of early whorls consisting of forwardly projecting small plications at umbilical edge, from which fine striae arise by bi- or trifurcation, growth striae may be intercalated, Later growth stages without plications, with increasing growth dichotomizing point receding from umbilical shoulder up to lateral area, Transverse striations noncrenulate, Constrictions usually present, Suture line with very broad ventral lobe and broadly rounded first lateral saddle
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Neodimorphoceratoidea
Family:
Ramositidae
Formal Genus Name and Reference:
Homoceratoides BISAT, 1924, p. 112
Type Species:
H. prereticulatus, OD
Images
(Click to enlarge in a new window)
Fig. 43, 3a. *H. prereticulatus, Holden Gill, Silsden, Airedale, Yorkshire, England, Kinderscoutian, X 4 (Bisat, 1924), Fig. 43, 3b-e. H. varicatus (Schmidt), juvenile forms, Neheim, Emde brickworks, Rhenish Massif, Germany, Kinderscoutian, b-c, GPIT 1492/1833, X 8, d-e, GPIT 1492 / 1834, X 5 (Kullmann, new), Fig. 43, 3f. H. librovitchi Ruzhentsev & Bogoslovskaia, holotype, suture, Schartym River, South Urals, Russia, Kinderscoutian, lower Bashkirian, PIN 455/40472, whorl height at 12.8 mm , whorl width 12.6 mm , X 2.5 (Ruzhentsev & Bogoslovskaia, 1978)
Synonyms
Geographic Distribution
Great Britain, Ireland, Belgium, Netherlands, Germany, Poland, Russia (South Urals), Ukraine (Donets), Portugal, Morocco, China (Guizhou, Xinjiang), Uzbekistan (Fergana)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (Bashkirian Kinderscoutian-Yeadonian)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
Pennsylvanian (Bashkirian Kinderscoutian-Yeadonian)
Ending International Stage:
Bashkirian
Fraction Up In Ending Stage:
56.3
Ending Date:
318.76
Description
Conch form as in Homoceras, Sculpture of early whorls consisting of forwardly projecting small plications at umbilical edge, from which fine striae arise by bi- or trifurcation, growth striae may be intercalated, Later growth stages without plications, with increasing growth dichotomizing point receding from umbilical shoulder up to lateral area, Transverse striations noncrenulate, Constrictions usually present, Suture line with very broad ventral lobe and broadly rounded first lateral saddle