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Trilacinoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Tarphycerida
Family:
Lituitidae
Formal Genus Name and Reference:
Trilacinoceras SWEET, 1958, p. 147
Type Species:
Lituites discors HOLM, 1891, p. 26, OD
Images
(Click to enlarge in a new window)
Fig. 268, 1a-d. *T. discors (Holm), ' M.Ord. (Llandeil.), Norway, 1a,b, lat. (venter on left) and ventral views of mature body chamber, x1; 1c, lat. view, x1.5; 1d, lat. view, x0.75 (178). -- Fig. 268, 1e,f. T. norvegicum Sweet, M.Ord. (Llandeil.), Norway, lat. (venter to right) and ventral views of fully mature body chamber, x1 (178).
Synonyms
Geographic Distribution
Eu. (Balto-Scandia)
Age Range
Beginning Stage in Treatise Usage:
M.Ord. (Llanvirn.)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
M.Ord. (Caradoc.)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
66.7
Ending Date:
447.72
Description
Like Lituites, but smaller and with less complex aperture, fully mature aperture characterized by pronounced pair of ventrolateral lappets, deep hyponomic sinus, and high dorsal salient, conch similar to Angelinoceras, but fully mature aperture not known in that genus.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Tarphycerida
Family:
Lituitidae
Formal Genus Name and Reference:
Trilacinoceras SWEET, 1958, p. 147
Type Species:
Lituites discors HOLM, 1891, p. 26, OD
Images
(Click to enlarge in a new window)
Fig. 268, 1a-d. *T. discors (Holm), ' M.Ord. (Llandeil.), Norway, 1a,b, lat. (venter on left) and ventral views of mature body chamber, x1; 1c, lat. view, x1.5; 1d, lat. view, x0.75 (178). -- Fig. 268, 1e,f. T. norvegicum Sweet, M.Ord. (Llandeil.), Norway, lat. (venter to right) and ventral views of fully mature body chamber, x1 (178).
Synonyms
Geographic Distribution
Eu. (Balto-Scandia)
Age Range
Beginning Stage in Treatise Usage:
M.Ord. (Llanvirn.)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
M.Ord. (Caradoc.)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
66.7
Ending Date:
447.72
Description
Like Lituites, but smaller and with less complex aperture, fully mature aperture characterized by pronounced pair of ventrolateral lappets, deep hyponomic sinus, and high dorsal salient, conch similar to Angelinoceras, but fully mature aperture not known in that genus.