PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Planulina membranacea

Globothalamea - Rotaliida - Cibicididae

Taxonomy

Planulina membranacea was named by Ehrenberg (1854). It is not extant.

It was recombined as Globorotalia chapmani by Parr (1938); it was recombined as Globorotalia membranacea by Subbotina (1953); it was recombined as Globanomalina ovalis lakiensis by Haque (1956); it was recombined as Globorotalia elongata by Bolli (1957); it was recombined as Globorotalia (Globorotalia) ehrenbergi by Hillebrandt (1962); it was recombined as Planorotalites chapmani by Nederbragt and van Hinte (1987); it was recombined as Globanomalina chapmani by Olsson et al. (1999).

Sister species lacking formal opinion data

P. rakauroana, P. sastryi

Year	Name and author
1854	Planulina membranacea Ehrenberg
1938	Globorotalia chapmani Parr pp. 87-88 figs. 3 (8, 9 a, b.)
1953	Globorotalia membranacea Subbotina pp. 78-79
1956	Globanomalina ovalis lakiensis Haque p. 149 figs. Pl. 14, Fig. 2a-c
1957	Globorotalia elongata Bolli pp. 77-78 figs. Pl. 20, Fig. 11-13
1962	Globorotalia (Globorotalia) ehrenbergi Hillebrandt p. 126 figs. Pl. 12, Fig. 3a-c, 4a-b
1987	Planorotalites chapmani Nederbragt and van Hinte pp. 586-587 figs. Pl. 2, Fig. 1-16; Pl. 3, Fig. 1-15
1999	Globanomalina chapmani Olsson et al. pp. 39-40 figs. Pl. 34, Fig. 1-7

Reference	Diagnosis
W. J. Parr 1938	Test biconvex, oval, the dorsal surface more convex than the ventral, which is umbilicate: periphery lobulated, peripheral margin rounded; chambers comparatively few, no more than five in the last-formed whorl, each much larger than its predecessor; sutures depressed, not limbate, gently recurved on both sides of the test; wall smooth and punctate, with a silvery lustre; aperture an elongate slit with a slight lip, opening at the base of the last-formed chamber into the umbilical depression. Length up to 0.65 mm.
H. M. Bolli 1957	Shape of test very low trochospiral, compressed, spiral side often slightly concave, umbilical side moderately convex; equatorial periphery slightly lobate, elongate; axial periphery subacute to acute but without keel. Wall calcareous, perforate, surface smooth. Chambers moderately to strongly compressed; about 12, arranged in 2- 2.5 whorls, the 6 chambers of the last whorl increasing rapidly in size. Sutures on spiral side slightly curved, distinctly depressed; on umbilical side radial, distinctly depressed. Umbilicus fairly wide, open. Aperture a low arch, interiomarginal, extraumbilical-umbilical. Coiling random. Largest diameter of figured hypotype 0.33 mm.