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Agathiceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Agathiceratoidea
Family:
Agathiceratidae
Formal Genus Name and Reference:
Agathiceras GEMMELLARO, 1887, p. 75
Type Species:
A. suessi GEMMELLARO, 1887, p. 79, OD
Images
(Click to enlarge in a new window)
FiG. 36,1a–d. *A. suessi; a–c, lectotype, Palazzo Adriano, Sicily, Italy, Sosio Limestone, Wordian, MGUP 86, approximately ×1.5 (Davis, Furnish, & Glenister, 1969); d, cross section, SUI 13613A, ×3 (Dixon, 1960).——FiG. 36,1e–h. A. frechi Böse, Wolf Camp, Glass Mountains, Brewster County, Texas, USA, Gaptank Formation, Virgilian, YPM 16762, × 2 (Miller & Furnish, 1940a).——F i G . 36,1i–n. A. uralicum (K arpins K ii ), ontogenetic development of suture line; i, whorl width at 0.8 mm, PIN 317/2437, ×25; j, whorl width at 1 mm, ×25; k, whorl width at 1.3 mm, ×25; l, whorl width at 3.3 mm, ×10; m, whorl height at 3.5 mm, whorl width 4.3 mm, ×10; n, left bank of Aktasty River, eastern limestones, Aktastinskii subformation, Artinskian, PIN 317/2435, whorl height at 12 mm, whorl width 11 mm, ×5 (Ruzhentsev, 1956b).
Synonyms
Paragathiceras
Geographic Distribution
Italy (Carnic Alps, Sicily), Slovenia, Tunisia, Ukraine (Crimea), Russia (South Urals, Siberia), Kazakhstan (South Urals), Afghanistan, China (Guizhou, Guangxi, Jilin, Nei Monggol, Xinjiang, Xizang), Iraq, Oman, Indonesia (Timor), Japan (Akiyoshi, Kitakami), Tajikistan (Darvaz, Pamirs), Thailand, Canada (British Columbia, Northwest Territories), Mexico
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (Kasimovian)
Beginning International Stage:
Kasimovian
Fraction Up In Beginning Stage:
0
Beginning Date:
307.02
Ending Stage in Treatise Usage:
Guadalupian (Wordian)
Ending International Stage:
Wordian
Fraction Up In Ending Stage:
100
Ending Date:
264.34
Description
Conch form subdiscoidal, involute. Sculpture with prominent longitudinal lirae. Apertural constrictions common. Ventral lobe broad, with pouched, apicad pointed branches, median saddle in some forms reaching almost total height of ventral lobe. In adult, adventitious lobe of early whorls developing three discrete and subequal spatulate lobes.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Agathiceratoidea
Family:
Agathiceratidae
Formal Genus Name and Reference:
Agathiceras GEMMELLARO, 1887, p. 75
Type Species:
A. suessi GEMMELLARO, 1887, p. 79, OD
Images
(Click to enlarge in a new window)
FiG. 36,1a–d. *A. suessi; a–c, lectotype, Palazzo Adriano, Sicily, Italy, Sosio Limestone, Wordian, MGUP 86, approximately ×1.5 (Davis, Furnish, & Glenister, 1969); d, cross section, SUI 13613A, ×3 (Dixon, 1960).——FiG. 36,1e–h. A. frechi Böse, Wolf Camp, Glass Mountains, Brewster County, Texas, USA, Gaptank Formation, Virgilian, YPM 16762, × 2 (Miller & Furnish, 1940a).——F i G . 36,1i–n. A. uralicum (K arpins K ii ), ontogenetic development of suture line; i, whorl width at 0.8 mm, PIN 317/2437, ×25; j, whorl width at 1 mm, ×25; k, whorl width at 1.3 mm, ×25; l, whorl width at 3.3 mm, ×10; m, whorl height at 3.5 mm, whorl width 4.3 mm, ×10; n, left bank of Aktasty River, eastern limestones, Aktastinskii subformation, Artinskian, PIN 317/2435, whorl height at 12 mm, whorl width 11 mm, ×5 (Ruzhentsev, 1956b).
Synonyms
Paragathiceras
Geographic Distribution
Italy (Carnic Alps, Sicily), Slovenia, Tunisia, Ukraine (Crimea), Russia (South Urals, Siberia), Kazakhstan (South Urals), Afghanistan, China (Guizhou, Guangxi, Jilin, Nei Monggol, Xinjiang, Xizang), Iraq, Oman, Indonesia (Timor), Japan (Akiyoshi, Kitakami), Tajikistan (Darvaz, Pamirs), Thailand, Canada (British Columbia, Northwest Territories), Mexico
Age Range
Beginning Stage in Treatise Usage:
Pennsylvanian (Kasimovian)
Beginning International Stage:
Kasimovian
Fraction Up In Beginning Stage:
0
Beginning Date:
307.02
Ending Stage in Treatise Usage:
Guadalupian (Wordian)
Ending International Stage:
Wordian
Fraction Up In Ending Stage:
100
Ending Date:
264.34
Description
Conch form subdiscoidal, involute. Sculpture with prominent longitudinal lirae. Apertural constrictions common. Ventral lobe broad, with pouched, apicad pointed branches, median saddle in some forms reaching almost total height of ventral lobe. In adult, adventitious lobe of early whorls developing three discrete and subequal spatulate lobes.