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Deltoidonautilus
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Nautilida
Superfamily:
Nautilaceae
Family:
Hercoglossidae
Formal Genus Name and Reference:
Deltoidonautilus SPATH, 1927
Type Species:
Nautilus Sowerbyi SOWERBY, 1843, OD
Images
(Click to enlarge in a new window)
Fig. 336,4. D. triangularis (deMontfort), U.Cret., Fr., 4a, b, x0.3 (115)
Synonyms
Lissoniceras, Teichertia, ?Angulithes, Angulites
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
Oligo.
Ending International Stage:
Chattian
Fraction Up In Ending Stage:
100
Ending Date:
23.04
Description
nautiliconic, involute, compressed, with small inconspicuous umbilicus, whorl section sagittate, with narrowly rounded to angular ventral zone, lateral areas converging toward venter, deeply impressed dorsal zone. Growth lines forming deep hyponomic sinus, suture with broad narrowly rounded to acute ventral saddle, large lateral lobe, small lateral saddle and lobe on umbilical wall, dorsal lobe which may be very narrow, siphuncle near dorsum. [Type-species of Deltoidonautilus. - See the long footnote at the PDF-link to its Family Hercoglossidae.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Nautilida
Superfamily:
Nautilaceae
Family:
Hercoglossidae
Formal Genus Name and Reference:
Deltoidonautilus SPATH, 1927
Type Species:
Nautilus Sowerbyi SOWERBY, 1843, OD
Images
(Click to enlarge in a new window)
Fig. 336,4. D. triangularis (deMontfort), U.Cret., Fr., 4a, b, x0.3 (115)
Synonyms
Lissoniceras, Teichertia, ?Angulithes, Angulites
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
Oligo.
Ending International Stage:
Chattian
Fraction Up In Ending Stage:
100
Ending Date:
23.04
Description
nautiliconic, involute, compressed, with small inconspicuous umbilicus, whorl section sagittate, with narrowly rounded to angular ventral zone, lateral areas converging toward venter, deeply impressed dorsal zone. Growth lines forming deep hyponomic sinus, suture with broad narrowly rounded to acute ventral saddle, large lateral lobe, small lateral saddle and lobe on umbilical wall, dorsal lobe which may be very narrow, siphuncle near dorsum. [Type-species of Deltoidonautilus. - See the long footnote at the PDF-link to its Family Hercoglossidae.]