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Nejdia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Eoderocerataceae
Family:
Hammatoceratidae
Formal Genus Name and Reference:
Nejdia ARKELL, 1952
Type Species:
N. bramkampi
Images
(Click to enlarge in a new window)
Fig. 306,1. *N. bramkampi, C.Arabia, 1 a, b, X0.7 (583*)
Synonyms
Geographic Distribution
C.Arabia-Madag.
Age Range
Beginning Stage in Treatise Usage:
Toarc.
Beginning International Stage:
Toarcian
Fraction Up In Beginning Stage:
0
Beginning Date:
184.2
Ending Stage in Treatise Usage:
Toarc.
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
100
Ending Date:
174.7
Description
Involute, smooth, whorl section lanceolate, with steep or undercut umbilical wall but rounded umbilical edge, sutures subceratitic, highly variable
References
Arkell, W. J., 1952, Jurassic ammonites from lebel Tuwaiq, central Arabia: Philos. Trans. Roy. Soc. (London), ser. B, v. 236, no. 633, p. 241313, pl. 15-31.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Eoderocerataceae
Family:
Hammatoceratidae
Formal Genus Name and Reference:
Nejdia ARKELL, 1952
Type Species:
N. bramkampi
Images
(Click to enlarge in a new window)
Fig. 306,1. *N. bramkampi, C.Arabia, 1 a, b, X0.7 (583*)
Synonyms
Geographic Distribution
C.Arabia-Madag.
Age Range
Beginning Stage in Treatise Usage:
Toarc.
Beginning International Stage:
Toarcian
Fraction Up In Beginning Stage:
0
Beginning Date:
184.2
Ending Stage in Treatise Usage:
Toarc.
Ending International Stage:
Toarcian
Fraction Up In Ending Stage:
100
Ending Date:
174.7
Description
Involute, smooth, whorl section lanceolate, with steep or undercut umbilical wall but rounded umbilical edge, sutures subceratitic, highly variable
References
Arkell, W. J., 1952, Jurassic ammonites from lebel Tuwaiq, central Arabia: Philos. Trans. Roy. Soc. (London), ser. B, v. 236, no. 633, p. 241313, pl. 15-31.