Taxon Concept provided by
| Taxon Concept provided by
|
|
| Home | Search | |
| TaxonConcept data set details: |
||||||
| Back to Search | ||||||
| Anonymous: Unedited TaxonConcept data | ||||||
| Notice: This catalogue page may contain unedited data.
| ||||||
Species Planoglobanomalina pseudoalgeriana Olsson & Hemleben 2006 | ||||||
|
|
||||||
| Diagnosis / Definition: | ||||||
|
Pearson et al. (2006): DESCRIPTION. Type of wall: Smooth, normal perforate. Well-preserved specimens show smooth calcite overgrowths on the umbilical shoulders of chambers and similar irregular, discontinuous smooth bands on the test periphery. Test morphology: Test asymmetrical to fully planispiral, compressed, loosely coiled, evolute, oval in outline, chambers compressed, distinctly elongate; inner spire of chambers visible due to loose coiling, 9-10 chambers in ultimate whorl, increasing gradually in size, last three chambers in ultimate whorl arranged in an uncoiling trend, sutures slightly depressed, straight to moderately curved, umbilicus moderate in size, circular in shape, apertural lips of ultimate chamber and previous chambers fuse to form a somewhat broad shelf that extends around the umbilicus, relict apertures present where apertural lips are not completely fused; in edge view primary aperture equatorial, asymmetric, an ovalshaped opening bordered by a broad lip, test much compressed with a pinched periphery which gives the chambers an ogival shape Size: Maximum diameter of holotype 0.39 mm, thickness 0.12 mm. |
||||||
| Discussion / Comments: | ||||||
|
Pearson et al. (2006): ETYMOLOGY.- Named for its resemblance to Globigerinelloides algerianus Cushman and ten Dam. DISTINGUISHING FEATURES.- The most distinguishing feature of Planoglobanomalina pseudoalgeriana n. sp. is the remarkable homeomorphy it shows with the upper Aptian planktonic foraminifer Globigerinetloides algerianus Cushman and ten Dam (1948) from which its name is derived. The test of P. pseudoalgeriana n. sp. is loosely coiled, evolute, and much compressed with 9-10 chambers in the ultimate whorl and with the last three chambers showing a trend towards uncoiling. Globanomalina is trochospiral, tightly coiled, has few chambers in the ultimate whorl, and an extraumbilical aperture confined to the umbilical side. DISCUSSION.- Planoglobanomalina pseudoalgeriana n. sp. is the type species for the new genus Planoglobanomalina. Blow referred morphotypes from a North Atlantic core to the Eocene/Oligocene planispiral genus Pseudohastigerina and stated that the genus had a polyphyletic origin, first appearing at the beginning of the Eocene and again in the early Eocene Zone P9. We believe that Blow's observations are correct in as much as we have observed a similar relationship in Zone E6 in the western North Pacific ODP Hole 865B and are the basis for this new species. Hillebrandt (1976) was first to illustrate this species (identified as P. micra) in Zone E7 from southeastern Spain. PHYLOGENETTC RELATIONSHIPS.- Planoglobanomalina pseudoalgeriana n. sp. evolved from Globanomalina planoconica in Zone E6. STRATIGRAPHIC RANGE.- Zone E6 to Zone E8. GEOGRAPHlC DISTRIBUTION.- The occurrence of this species in southeastern Spain, Tanzania, North Atlantic Ocean, and at ODP Hole 865B, western North Pacific Ocean suggests that it was widespread in low to mid latitudes. STABLE ISOTOPE PALEOBIOL0GY.- No data available |
||||||
| Systematics: | ||||||
|
35 Ordo Foraminiferida Superfamilia Globigerinaceae Familia Hedbergellidae Genus Planoglobanomalina Species Planoglobanomalina pseudoalgeriana |
||||||
| Synonym list: | ||||||
| Pearson et al. (2006): 1976 Pseudohastigerina micra Cole. - Hillebrandt : p.337 pl. 4; fig. 16, 17 [lower Eocene Globorotalia palmerae Zone,
southeastern Spain]
p 1979 Pseudohastigerina danvillensis Howe & Wallace. - Blow : p.1181 pl. 159, fig. 6-7;
pl. 161, fig. 2-7;
pl. 166, fig. 2-10 (not pl. 166, fig. 8-10; pl. 253: fig.
10-12); [middle Eocene Zone P1 0, KANE 9-Core 42,
equatorial Atlantic Ocean];
[Not Howe and Wallace, 1932]
2006 Planoglobanomalina n sp. pseudoalgeriana Olsson & Hemleben. - Pearson et al. : p.421 pl. 14.2; fig. 1-20
|
||||||
| Specimen: | ||||||
| Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 523183 Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 523184 |
||||||
| References: | ||||||
Hillebrandt,A. (1976): Blow,W.H. (1979): Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006): |
||||||
| Anonymous: Unedited TaxonConcept data | ||||||
 This work is licensed under a Creative Commons Attribution 2.5 License. | ||||||
| Back to Search | ||||||
|
Taxon relations
Ranking (experimental) |
||||||