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Verneuilites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Gastrioceratoidea
Family:
Reticuloceratidae
Subfamily:
Surenitinae
Formal Genus Name and Reference:
Verneuilites LIBROVICH, 1939b, p. 16
Type Species:
*Glyphioceras diadema verneuili y anishevs K ii , 1900, p. 322; OD
Images
(Click to enlarge in a new window)
F ig . 55,3a. *V. verneuili ( y anishevs K ii ), suture, Shartym river, Cheliabinskaia oblast', South Urals, Russia, lower Bashkirian, Yeadonian, PIN 455/42624, whorl height at 10 mm, whorl width 11 mm, × 3.2 (Ruzhentsev & Bogoslovskaia, 1978).——F ig . 55,3b–d. V. pygmaeus ( m ather ), Kessler Mountain, east side, Washington County, Arkansas, Bloyd Formation, UA 77-205-6; b–c, × 2.7; d, cross section, UA 77-218-213, × 2.7 (Manger & Saunders, 1980).
Synonyms
Pygmaeoceras; ?Paraverneuilites
Geographic Distribution
Great Britain, Russia (South Urals, Siberia), ?Ukraine (Donets), China (Ningxia, Xinjiang), USA (Arkansas, Oklahoma)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (Bashkirian Yeadonian, ?Langsettian)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
40.6
Beginning Date:
320.05
Ending Stage in Treatise Usage:
Pennsylvanian (Bashkirian Yeadonian, ?Langsettian)
Ending International Stage:
Bashkirian
Fraction Up In Ending Stage:
73.4
Ending Date:
317.34
Description
Conch at early growth stage widely umbilicate, adult conch form lenticular to subdiscoidal, involute, with narrow, in some forms very narrow, umbilicus. Growth lines almost linear, without sharp ventrolateral salient. Early stages display finely crenulate lirae, which may became delicately reticulate later. Umbilical plications or nodelike riblets present. Some forms with constrictions. Ventral lobe considerably wide, median saddle reaching two-thirds height of entire ventral lobe. Seven or eight species. [Pygmaeoceras is based on immature specimens that seem to be congeneric with Verneuilites; for discussion, see m anger & saunders, 1980, p. 46. Paraverneuilites is based on immature specimens that are similar in conch shape to Verneuilites but do not show umbilical nodes and reticulate ornamentation; suture unknown.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Goniatitina
Superfamily:
Gastrioceratoidea
Family:
Reticuloceratidae
Subfamily:
Surenitinae
Formal Genus Name and Reference:
Verneuilites LIBROVICH, 1939b, p. 16
Type Species:
*Glyphioceras diadema verneuili y anishevs K ii , 1900, p. 322; OD
Images
(Click to enlarge in a new window)
F ig . 55,3a. *V. verneuili ( y anishevs K ii ), suture, Shartym river, Cheliabinskaia oblast', South Urals, Russia, lower Bashkirian, Yeadonian, PIN 455/42624, whorl height at 10 mm, whorl width 11 mm, × 3.2 (Ruzhentsev & Bogoslovskaia, 1978).——F ig . 55,3b–d. V. pygmaeus ( m ather ), Kessler Mountain, east side, Washington County, Arkansas, Bloyd Formation, UA 77-205-6; b–c, × 2.7; d, cross section, UA 77-218-213, × 2.7 (Manger & Saunders, 1980).
Synonyms
Pygmaeoceras; ?Paraverneuilites
Geographic Distribution
Great Britain, Russia (South Urals, Siberia), ?Ukraine (Donets), China (Ningxia, Xinjiang), USA (Arkansas, Oklahoma)
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (Bashkirian Yeadonian, ?Langsettian)
Beginning International Stage:
Bashkirian
Fraction Up In Beginning Stage:
40.6
Beginning Date:
320.05
Ending Stage in Treatise Usage:
Pennsylvanian (Bashkirian Yeadonian, ?Langsettian)
Ending International Stage:
Bashkirian
Fraction Up In Ending Stage:
73.4
Ending Date:
317.34
Description
Conch at early growth stage widely umbilicate, adult conch form lenticular to subdiscoidal, involute, with narrow, in some forms very narrow, umbilicus. Growth lines almost linear, without sharp ventrolateral salient. Early stages display finely crenulate lirae, which may became delicately reticulate later. Umbilical plications or nodelike riblets present. Some forms with constrictions. Ventral lobe considerably wide, median saddle reaching two-thirds height of entire ventral lobe. Seven or eight species. [Pygmaeoceras is based on immature specimens that seem to be congeneric with Verneuilites; for discussion, see m anger & saunders, 1980, p. 46. Paraverneuilites is based on immature specimens that are similar in conch shape to Verneuilites but do not show umbilical nodes and reticulate ornamentation; suture unknown.]