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Species Chiloguembelina ototara Finlay 1940


Diagnosis / Definition:
Pearson et al. (2006):
DESCRIPTION. Type of wall: Microperforate, uniformly finely pustulose, lacking pore mounds or costae. Test morphology: Test short to somewhat elongate, moderately to rapidly expanding, subtriangular in outline, periphery rounded rather than compressed; chambers biserial, increasing moderately to rapidly in size, usually 11-12, and sometimes up to 15 in adult specimens; sutures depressed, perpendicular to slightly oblique to growth axis; aperture a moderately narrow to broad symmetrical arch centered or slightly off-center of the base of the final chamber, extending half-way up the final chamber face, bordered on one side by a narrow lip that thickens away from its attachment point on the chamber face. Size: Paratype USNM 689 102: length, 0.17 mm, width 0.10 mm, breadth 0.07 mm; hypotypes up to 0.23 mm length, 0.9 mm breadth.
Discussion / Comments:
Pearson et al. (2006):
DISTINGUISHING FEATURES.- Distinguished from C. cubensis by the absence of striae on the wall surface and the shorter, more strongly tapering test, and from S. martini by its more inflated chambers and lower apertural arch. DISCUSSION.- Hornibrook (1990) was the first to draw attention to the significant difference in wall texture between topotypes of C. cubensis, which are striate, and topotypes of C. ototara, which have pustules that are randomly distributed on the test surface rather than striae. These differences are apparent in SEM images but they are difficult to discern under the light microscope. Guembelina cubensis Palmer var. heterostoma Bermudez and Guembelina venezuelana Nuttall var. rugosa Parr may be prior synonyms but their wall textures are currently undetermined. Guembelina multicellaris Hussey is considered synonymous with C. ototara based on SEM observation of the multicellaris holotype (PI. 16.3, Figs. 9,10), which reveals an elongate test with inflated chambers, a low, interiomarginal aperture, and pustules rather than striae on the wall surface. PHYLOGENETIC RELATIONSHIPS.- Probably descended from Chiloguembelina crinita during the early middle Eocene. STRATIGRAPHIC RANGE.- Middle Eocene Zone E9 through lower Oligocene Zone 01. The lowest and highest occurrences of this species are difficult to determine because of its morphologic similarity to its presumed ancestor, C. crinita, and its likely descendant, C. cubensis. A lowermost Oligocene (Zone 01) extinction of this species was recorded in New Zealand (Hornibrook, 1990) and ODP Sites 806 and 807 on Ontong Java Plateau (Resig, 1993). GEOGRAPHIC DISTRIBUTION.- Cosmopolitan. STABLE ISOTOPE PALEOBIOLOGY.- Stable isotope data obtained for upper Eocene C. ototara (Barrera and Huber, 1991; identified as Chiloguembelina spp.) suggest that it lived near the surface mixed layer at high southern latitudes. REPOSITORY.- Holotype and paratypes deposited in the Geological and Nuclear Research Institute, Lower Hutt, New Zealand; paratype (USNM 689102) also deposited at the Smithsonian Museum of Natural History, Washington, D.C.
Systematics:

35
 Ordo Foraminiferida
  Superfamilia Globigerinaceae
   Familia Chiloguembelinidae
    Genus Streptochilus
Synonym list:
Pearson et al. (2006):
? 1937 Guembelina cubensis var. heterostoma Bermudez. - Bermudez : p.143 pl. 17; fig. 6-8 [upper Eocene, Camaguey Province, Cuba]
? 1938 Guembelina venezuelana var. rugosa Parr. - Parr : p.82 pl. 2; fig. 8a, b [upper Eocene, King's Park, Perth, Australia]
1940 Guembelina ototara Finlay. - Finlay : p.453 pl. 63; fig. 50-52 [Oamaru Diatomite, latest Eocene (Runangan Stage) South Island, New Zealand]
1971 Chiloguembelina cubensis Palmer. - Jenkins : p. 66-67 pl. 1; fig. 3-5
1985 Chiloguembelina cubensis Palmer. - Jenkins & Srinivasan : p.807 pl. 1; fig. 2 [upper Eocene Globigerina linaperta Zone, DSDP Site 592, Lord Howe Rise]
1990 Chiloguembelina ototara Finlay. - Hornibrook : pl. 1; fig, 12-16 [Oamaru Diatomite, latest Eocene (Runangan Stage), South Island, New Zealand]
1991 Chiloguembelina cubensis Palmer. - Huber : p.440 pl. 6; fig. 8 [Zone AP13, lower Oligocene, ODP Hole 738B, Kerguelen Plateau, southern Indian Ocean];[ Not Palmer, 1934]
1993 Chiloguembelina ototara Finlay. - Resig : pl. 1; fig. 9 [upper Eocene, ODP Site 807, Ontong Java Plateau, western Pacific Ocean]
? 1993 Guembelina multicellaris Hussey. - Resig : p.130 pl. 27; fig. 10 [Eocene, Louisiana, U.S.A.]
2006 Chiloguembelina ototara Finlay. - Pearson et al. : p.480 pl. 16.3; fig. 9, 10, 13-22 (Pl. 16.3, Figs. 9, 10: new SEMs of holotype of Guembelina multicellaris Hussey) (Pl. 16.3, Figs. 13, 14: new SEMs of paratype of Guembelina ototara Finlay)
Specimen:
Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM 689102
References:

Bermudez,P.J. (1937):
Nuevas especies de foraminiferos del Eoceno, de Cuba . Mem. Soc. Cubana Hist. Nat. Vol. 11 p. 137-150

Parr,W.J. (1938):
Upper Eocene foraminifera from the deep borings in King's Park, Perth, Western Australia . J. R. Soc. Western Australia Vol. 24 p. 69-101

Finlay,H.J. (1940):
New Zealand Foraminifera; key species in stratigraphy . Transactions of the Royal Society of New Zealand Vol. 69

Jenkins,D.G. (1971):
New Zealand Cenozoic Planktonic Foraminifera . New Zealand Geological Survey Paleontological Bulletin Vol. 42

Jenkins,D.G. and Srinivasan,M.S. (1985):
Cenozoic planktonic foraminifera from the Equator to the Sub-Antarctic of the Southwest Pacific.
In: Initial Reports of the Deep Sea Drilling Project Vol. 90 Eds: Kennett, J.P.von der Borchand others p. 795-834

Hornibrook,N. (1990):
Chiloguembelina cubensis (Palmer) and C. ototara (Finlay), in New Zealand . Journal of Foraminiferal Research Vol. 20 p. 368-371

Huber,B.T. (1991):
Paleogene and early Neogene planktonic foraminifer biostratigraphy of Sites 738 and 744, Kerguelen Plateau (southern Indian Ocean).
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 119 Eds: Leckie, R.M.Sigurdsson, H.Acton, G.D.Draper, G. p. 427-449

Resig,J.M.. (1993):
Cenozoic stratigraphy and paleoceanography of biserial planktonic foraminifers, Ontong Java Plateau .
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 130 Eds: Berger, W.H.Kroenke, L.W..Mayer, L.A..and others p. 231-244

Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006):
Atlas of Eocene Planktonic Foraminifera. p. 1-513
Anonymous: Unedited TaxonConcept data
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