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Species Parasubbotina pseudowilsoni Olsson & Pearson 2006 | ||||||
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| Diagnosis / Definition: | ||||||
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Pearson et al. (2006): DESCRIPTION. Type of wall: Cancellate, normal perforate, spinose, ruber-sacculifer type wall texture. Test morphology: Test small, very low trochospiral, globular, lobulate in outline, chambers globular; in spiral view 5 globular, moderately embracing chambers in ultimate whorl, increasing moderately in size, sutures moderately depressed, ultimate chamber usually slightly reduced in size relative to the penultimate chamber; in umbilical view 5 globular, moderately embracing chambers, increasing moderately in size, sutures moderately depressed, straight; umbilicus a moderate sized opening, enclosed by surrounding chambers; aperture umbilical to somewhat extraumbilical, bordered by a continuous lip, which varies in its width from narrow to broad; in edge view chambers globular in shape, moderately embracing, aperture visible as a low arch, bordered by a narrow to broad lip. Size: Maximum diameter of holotype 0.25 mm, thickness 0.15 mm. |
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| Discussion / Comments: | ||||||
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Pearson et al. (2006): ETYMOLOGY.- Named after its resemblance to Globigerina wilsoni Cole which is referred to Globoturborotalita carcoselleen.sis in this work. DISTINGUISHING FEATURES.- Parasubbotina pseudowilsoni n. sp. is a small form with a compact, very low trochospiral test that typically has 5 chambers in the final whorl, as seen in dorsal view. Parasubbotina varianta is larger and has a more lobulate test with 4 chambers in the ultimate whorl. DISCUSSION.- Toumarkine and Luterbacher (1985) reillustrated the line drawing of the holotype of Globigerina wilsoni along with three SEM images they identified to that species from the type Guayabal Formation, from where G. wilsoni was originally described. New SEM images of the holotype of G. wilsoni (Chapter 6, P1. 6.23, Figs. 15-17), although poorly preserved, show that it differs from the hypotypes illustrated by Toumarkine and Luterbacher in that the ultimate chamber is more flattened and extends towards and over the umbilicus. In this respect, the holotype appears much more like Globorotaloides carcoselleensis Toumarkine and Bolli (=Turborotalita carcoselleensis), which is common in the Guayabal Formation. However, the poor state of preservation does not allow an accurate identification, and we place wilsoni in questionable synonymy with carcoselleensis. Parasubbotina pseudowilsoni n. sp. is also a common form in the Guayabal Formation and occurs as a relatively inconspicuous component in many other Eocene localities. PHYLOGENETIC RELATIONSHIPS.- Parasubbotina pseudowilsoni n. sp. appears to have developed hom P. varianta (Subbotina) in the uppermost Lower Eocene. GEOGRAPHIC DISTRIBUTION.- Cosmopolitan in low to mid latitudes. STABLE TSOTOPIC PALEOBIOL0GY.- No data available. |
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| Systematics: | ||||||
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35 Ordo Foraminiferida Superfamilia Globigerinaceae Familia Globigerinidae Genus Parasubbotina Species Parasubbotina pseudowilsoni |
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| Synonym list: | ||||||
| Pearson et al. (2006): 1985 Turborotalia wilsoni Cole. - Toumarkine & Luterbacher : p.125 fig. 27: 2-3 [middle Eocene Zone E10/11,
Guayabal Fm., type locality, Tampico, Mexico]. [Not Cole,
1927.]
2006 Parasubbotina n sp. pseudowilsoni Olsson & Pearson. - Pearson et al. : p.94 pl. 5.12; fig. 1-16
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| Specimen: | ||||||
| Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 521869 Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 521870 |
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| References: | ||||||
Toumarkine,M. and Luterbacher,H.P. (1985): Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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