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Hanzawaia
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Cassidulinacea
Family:
Anomalinidae
Subfamily:
Anomalininae
Formal Genus Name and Reference:
Hanzawaia ASANO, 1944, *50, p. 98
Type Species:
H. nipponica, OD
Images
(Click to enlarge in a new window)
Fig. 623,1,2. *H. nipponica, Plio., Japan, 1, evolute side of topotype, 2 a-c, opp. sides and edge view of hypotype, X41 (*2117)
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Mio.
Beginning International Stage:
Aquitanian
Fraction Up In Beginning Stage:
0
Beginning Date:
23.04
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test free, trochoid, plano-convex, periphery moderately angled with keel, flattened side partially involute with elevated flaps on lower margin of chamber partially or completely overlapping chambers of previous whorl and commonly coalescing over entire central area, opposite side involute but without open umbilicus, central area with clear boss, sutures strongly curved, thickened, wall calcareous, granular in microstructure, rather coarsely perforate except for clear area above aperture, central flaps of spiral side and thickened sutures and keel, all of which are of clear, apparently solid, calcite, aperture an arch on periphery, extending somewhat onto convex involute side but also laterally continuous with opening on flattened side, under central flap of final chamber, with supplementary openings under umbilical flaps, both on their outer and inner margins.
References
Museum or Author Information
Classification
Phylum:
Protista
Subphylum:
Sarcodina
Class:
Reticularea
Subclass:
Granuloreticulosia
Order:
Foraminiferida
Suborder:
Rotalina
Superfamily:
Cassidulinacea
Family:
Anomalinidae
Subfamily:
Anomalininae
Formal Genus Name and Reference:
Hanzawaia ASANO, 1944, *50, p. 98
Type Species:
H. nipponica, OD
Images
(Click to enlarge in a new window)
Fig. 623,1,2. *H. nipponica, Plio., Japan, 1, evolute side of topotype, 2 a-c, opp. sides and edge view of hypotype, X41 (*2117)
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Mio.
Beginning International Stage:
Aquitanian
Fraction Up In Beginning Stage:
0
Beginning Date:
23.04
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Test free, trochoid, plano-convex, periphery moderately angled with keel, flattened side partially involute with elevated flaps on lower margin of chamber partially or completely overlapping chambers of previous whorl and commonly coalescing over entire central area, opposite side involute but without open umbilicus, central area with clear boss, sutures strongly curved, thickened, wall calcareous, granular in microstructure, rather coarsely perforate except for clear area above aperture, central flaps of spiral side and thickened sutures and keel, all of which are of clear, apparently solid, calcite, aperture an arch on periphery, extending somewhat onto convex involute side but also laterally continuous with opening on flattened side, under central flap of final chamber, with supplementary openings under umbilical flaps, both on their outer and inner margins.