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Plectronoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Ellesmerocerida
Family:
Plectronoceratidae
Formal Genus Name and Reference:
Plectronoceras ULRICH & FOERSTE, 1933, p. 288
Type Species:
Cyrtoceras cambria WALCOTT, 1905, p. 22; OD
Images
(Click to enlarge in a new window)
Fig. 81, la,b. -P. cambria (WALCOTT), Shantung Prov.; septal and lat. views, X5 (204). --FIG. 81, lc. P. liaotungense KOBAYASHI, Manchuria; sec., X 10 (after 223b).
Synonyms
Geographic Distribution
China (Shantung Prov.)
Age Range
Beginning Stage in Treatise Usage:
U.Cam.
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
U.Cam.
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Compressed, fairly rapidly expanded endogastric cyrtocones; sutures with shallow lateral lobe; siphuncle about 0.2 of conch diameter, segments expanded; septal necks variable, from orthochoanitic to hemichoanitic or cyrtochoanitic; connecting rings inadequately known but probably thick, and adnate distally.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Ellesmerocerida
Family:
Plectronoceratidae
Formal Genus Name and Reference:
Plectronoceras ULRICH & FOERSTE, 1933, p. 288
Type Species:
Cyrtoceras cambria WALCOTT, 1905, p. 22; OD
Images
(Click to enlarge in a new window)
Fig. 81, la,b. -P. cambria (WALCOTT), Shantung Prov.; septal and lat. views, X5 (204). --FIG. 81, lc. P. liaotungense KOBAYASHI, Manchuria; sec., X 10 (after 223b).
Synonyms
Geographic Distribution
China (Shantung Prov.)
Age Range
Beginning Stage in Treatise Usage:
U.Cam.
Beginning International Stage:
Guzhangian
Fraction Up In Beginning Stage:
50
Beginning Date:
498.75
Ending Stage in Treatise Usage:
U.Cam.
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Compressed, fairly rapidly expanded endogastric cyrtocones; sutures with shallow lateral lobe; siphuncle about 0.2 of conch diameter, segments expanded; septal necks variable, from orthochoanitic to hemichoanitic or cyrtochoanitic; connecting rings inadequately known but probably thick, and adnate distally.