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Homoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Gastrioceratoidea
Family:
Homoceratidae
Subfamily:
Homoceratinae
Formal Genus Name and Reference:
Homoceras spiraloides BISAT & HUDSON, 1943, p. 407
Type Species:
Homoceras spiraloides BISAT & HUDSON, 1943, p. 407, OD
Images
(Click to enlarge in a new window)
Fig. 57, 5. *R. (S.) spiraloides (Bisat & Hudson), suture of paratype, Swint Clough, Alport Valley, Derbyshire, England, Reticuloceras Zone, Kinderscoutian, Keyworth GSM 63089, diameter at 15 mm , whorl height 8 mm, X 4.8 (Saunders & Ramsbottom, 1993).
Synonyms
Geographic Distribution
Great Britain, USA (Arkansas)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (lower Bashkirian Reticuloceras Zone)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
Pennsylvanian (lower Bashkirian Reticuloceras Zone)
Ending International Stage:
Bashkirian
Fraction Up In Ending Stage:
50
Ending Date:
319.28
Description
Reticulate ornamentation weakly developed, Noncrenulate to crenulate transverse striae linked by faint spiral lirae, Umbilical nodes at early whorls and constrictions on later stages may be present, Ventral lobe with narrow prongs that tend to be swollen
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Gastrioceratoidea
Family:
Homoceratidae
Subfamily:
Homoceratinae
Formal Genus Name and Reference:
Homoceras spiraloides BISAT & HUDSON, 1943, p. 407
Type Species:
Homoceras spiraloides BISAT & HUDSON, 1943, p. 407, OD
Images
(Click to enlarge in a new window)
Fig. 57, 5. *R. (S.) spiraloides (Bisat & Hudson), suture of paratype, Swint Clough, Alport Valley, Derbyshire, England, Reticuloceras Zone, Kinderscoutian, Keyworth GSM 63089, diameter at 15 mm , whorl height 8 mm, X 4.8 (Saunders & Ramsbottom, 1993).
Synonyms
Geographic Distribution
Great Britain, USA (Arkansas)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (lower Bashkirian Reticuloceras Zone)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
0
Beginning Date:
323.4
Ending Stage in Treatise Usage:
Pennsylvanian (lower Bashkirian Reticuloceras Zone)
Ending International Stage:
Bashkirian
Fraction Up In Ending Stage:
50
Ending Date:
319.28
Description
Reticulate ornamentation weakly developed, Noncrenulate to crenulate transverse striae linked by faint spiral lirae, Umbilical nodes at early whorls and constrictions on later stages may be present, Ventral lobe with narrow prongs that tend to be swollen