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Planulina membranacea
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).
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
Synonymy list
| 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 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Planulina membranacea Ehrenberg 1854
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Diagnosis
| 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. |
Measurements
No measurements are available
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| Source: g = genus, o = order | |||||
| Reference: Kiessling 2004 | |||||
Collections
No collection or age range data are available