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Biwaella
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Fusulinina
Superfamily:
Fusulinacea
Family:
Fusulinidae
Subfamily:
Schwagerininae
Formal Genus Name and Reference:
Biwaella Morikawa & ISOMI, 1960, p. 301
Type Species:
B. omiensis, OD
Images
(Click to enlarge in a new window)
Fig. 315, 2. *B. omiensis, Honshu Is., 2a,b, sagittal and axial secs. of paratype and holotype, X50 (*1313).
Synonyms
Geographic Distribution
Japan
Age Range
Beginning Stage in Treatise Usage:
L.Perm.
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
L.Perm.
Ending International Stage:
Kungurian
Fraction Up In Ending Stage:
100
Ending Date:
274.37
Description
Shell minute, elongate-fusiform, lateral slopes broadly convex, external furrows distinct, more broadly spaced than in most other fusulinids of similar size; axis of coiling straight to irregularly arcuate, first I or 2 volutions evolute and coiled at right angles to outer fusiform volutions, shell becoming ellipsoidal at second to third volu tion and then fusiform, rapidly attaining mature shape; spirotheca thick, composed of tectum and thicker porous lower layer (?keriotheca); septa widell' spaced, slightly fluted in polar regions; chomata distinct throughout fusiform part of shell, oYerhanging along sides of tunnel (*1313).
References
Moore, Charles, , \& Isomi, Hiroshi, 1960, A new genus Biwaella, Schwagerina-like Schubertella: Saitama Univ., Sci. Rept., ser. B, v. 3, no. 3, p. 301-305, pl. 54.
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Fusulinina
Superfamily:
Fusulinacea
Family:
Fusulinidae
Subfamily:
Schwagerininae
Formal Genus Name and Reference:
Biwaella Morikawa & ISOMI, 1960, p. 301
Type Species:
B. omiensis, OD
Images
(Click to enlarge in a new window)
Fig. 315, 2. *B. omiensis, Honshu Is., 2a,b, sagittal and axial secs. of paratype and holotype, X50 (*1313).
Synonyms
Geographic Distribution
Japan
Age Range
Beginning Stage in Treatise Usage:
L.Perm.
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
L.Perm.
Ending International Stage:
Kungurian
Fraction Up In Ending Stage:
100
Ending Date:
274.37
Description
Shell minute, elongate-fusiform, lateral slopes broadly convex, external furrows distinct, more broadly spaced than in most other fusulinids of similar size; axis of coiling straight to irregularly arcuate, first I or 2 volutions evolute and coiled at right angles to outer fusiform volutions, shell becoming ellipsoidal at second to third volu tion and then fusiform, rapidly attaining mature shape; spirotheca thick, composed of tectum and thicker porous lower layer (?keriotheca); septa widell' spaced, slightly fluted in polar regions; chomata distinct throughout fusiform part of shell, oYerhanging along sides of tunnel (*1313).
References
Moore, Charles, , \& Isomi, Hiroshi, 1960, A new genus Biwaella, Schwagerina-like Schubertella: Saitama Univ., Sci. Rept., ser. B, v. 3, no. 3, p. 301-305, pl. 54.