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Test with chambers added alternately with respect to the test groth axis resulting in a biserial arrangement. Earlier chambers are globular, those of the adult stage petaloid, subrectangular or with antero-posterior elongation. Sutures are distinct and depressed, often hardly visible between earlier chambers of the test. Test compressed in edge view; periphery is simple, without peripheral structures. Aperture is a subcircular to subogival arch at the base of the last formed chamber. Chamber ornamentation consists of leptocostae; well-developed periapertural pustulose area. Test wall calcitic, hyaline and perforate.
Etymology: name derived from the Latin prefix plano- (= plane) to which the suffix -itella is added; the reference is to the compressed tests in lateral view.
Extra details from original publication
Remarks.– Planulitella differs from Protoheterohelix Georgescu and Huber, 2009 (late Albian-early Turonian) mainly by having symmetrical tests and periapertural structures. It differs from Planoheterohelix (middle Cenomanian-lower Maastrichtian) by having compressed tests in edge view, larger pores (1.1-4.4 μm rather than 0.5-0.9 μm) and chambers ornamented with thicker leptocostae, which can be coarser over the earlier portion of the test. Heterohelix Ehrenberg, 1843 (early Turonian-Santonian) also presents slightly compressed tests but differs from Planulitella by having lateral tubulospine-like projections, smooth or finely striate tests and finer pores (0.4-0.8 μm rather than 1.1-4.4 μm).
Stratigraphic range.– Santonian (from the uppermost part of D. concavata Biozone to D. asymetrica Biozone).
Planulitella compiled by the pforams@mikrotax project team viewed: 13-6-2021
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