Globoturborotalita martini Blow & Banner 1962 from: Pearson, P.N.Olsson, R.K.Hemleben, C.Huber, B.T.Berggren, W.A. (2006): Atlas of Eocene Planktonic Foraminifera. p. 1-513 | . |
Notice: This catalogue page may contain unedited data.
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Species Globoturborotalita martini Blow & Banner 1962 |
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| Diagnosis / Definition: |
Pearson et al. (2006):
DESCRIPTION.
Type of wall: Cancellate, normal perforate,
spinose, ruber-type wall structure. Test morphology: Test small, moderately low
trochospiral, globular, lobulate in outline, chambers
globular; in spiral view 4 globular, slightly embracing
chambers in ultimate whorl, increasing rapidly in size,
sutures depressed, straight; in umbilical view 4 globular,
slightly embracing chambers, increasing rapidly in size,
final chamber reduced in size extending over and
partially covering the umbilicus, sutures depressed,
straight, umbilicus small, partially covered by the
ultimate chamber, aperture umbilical, a rounded arch,
bordered by thickened rim; in edge view chambers
globular in shape, slightly embracing.
Size: Maximum diameter of holotype 0.32 mm,
thickness 0.22 mm. |
| Discussion / Comments: |
Pearson et al. (2006):
DISTINGUISHING FEATURES.-
The species is characterized by its small size, 4 globular, slightly embracing, chambers in the ultimate whorl and the reduced ultimate chamber that extends over and partially covers the umbilicus, and a cancellate sacculifer-type, spinose wall texture.
DISCUSSION.-
Blow (1979) noted the close
morphological similarity between Globigerinita (vel
Globoturborotalita) martini martini and his new species
Globigerinita (vel Globoturborotalita) hardingae and
regarded the two species as probably phylogenetically
related. He emphasized the coarsely cancellate wall
texturc present in each species but separated G.
hardingue from G. martini on the basis of a slower
increase in chamber size, a smaller ultimate chamber
(referred to as a bulla by Blow), and a more coarsely
cancellate wall texture in G. hardingae. However, these
morphologic features are here regarded as a difference
in degree rather than kind. In fact, the SEM images of
the holotype of G. martini (Pl. 6.2, Figs. 8-1 l) show no
discernible difference in the coarseness of the cancellate
structure between the two morphotypes. The wall texture of G. martini (Pl. 6.2, Fig. 11) is a typical
Globoturborotulita wall texture.
Morphological differences between the two
subspecies of G. martini erected by Blow and Banner
are not regarded here as sufficient to warrant the
separation of the two morphotypes as subspecies.
PHYLOGENETIC RELATIONSHIPS.-
The derivation of Globoturborotalita martini is probably
from Globoturborotalita bassriverensis n. sp., and may
represent an intermediate morphology between four and
five chambered species in the radiation of
Globoturborotalita in the Eocene.
GEOGRAPHIC DISTRLBUTION.-
Distributed in mid to low latitudes.
STABLE ISOTOPIC PALEOBIOL0GY.-
Recorded (as Globoturborotalito sp.) with the most negative ò180 of an upper Eocene assemblage from Tanzania by
Pearson and others (2001), indicating a shallow, warm
water habitat. |
| Systematics: |
35
Ordo Foraminiferida
Superfamilia Globigerinaceae
Familia Globigerinidae
Genus Globoturborotalita
Species Globoturborotalita martini
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| Synonym list: |
Pearson et al. (2006):
1962 Globigerinita martini martini Blow & Banner. - Blow & Banner : p.110 pl. 14; fig. O [upper Eocene Cribrohantkenina danvillensis Zone, Sample FCRM 1932, Lindi area, Tanzania]
1962 Globigerinita martini scandretti Blow & Banner. - Blow & Banner : p.111 pl. 14; fig. V-X [lower Oligocene Globigerina
oligocaenica Zone, Sample FCRM 1922, Lindi area,
Tanzania]
1979 Globigerinita martini martini Blow & Banner. - Blow : p.1340 pl. 24, fig. 5;
pl. 25, fig. 5, 6 [upper Eocene Zone E1 5/16, Red Bluff Clay, type locality, Alabama]
1979 Globigerinita martini scandretti Blow & Banner. - Blow : p.1342 pl. 24, fig. 6, 7 [lower Oligocene Zone 02, Sample FCRM 1922, Lindi area, Tanzania];
pl. 245, fig. 7 [lower Oligocene Zone 01, DSDP
Site 14, central South Atlantic Ocean]
1979 Globigerinita hardingae Blow. - Blow : p.1338 pl. 178; fig. 1-5 (4 = holotype) [middle Eocene Zone E9, Sample RS. 24,
Kilwa area, Tanzania]
2001 Catapsydrax martini Blow & Banner. - Warraich & Ogasawara : p.45 fig. 12, 15, 16 [Zone El0/1l, Kirthar Fm., Sulaiman Range, Pakistan]
2006 Globoturborotalita martini Blow & Banner. - Pearson et al. : p.120 pl. 6.2, fig. 8-18 (Pl. 6.2, Figs. 8- 11 : new SEMs of holotype of
Globigerinita martini martini Blow and Banner)
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| Specimen: |
Natural History Museum, London, Inventory number: P445549
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| References: |
Blow,W.H. and Banner,F.T. (1962):
The Mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae.
In: Fundamentals of Mid‑Tertiary Stratigraphical Correlation Eds: Eames, F.E.Banner, F.T.Blow, W.H.Clarke, W.J. p. 61‑151
Blow,W.H. (1979):
The Cainozoic Globigerinida. 3 Vols p. 1413 pp
Warraich,M.Y.. and Ogasawara,K.. (2001):
Tethyan Paleocene-Eocene planktic foraminifera from the Rakhi Nala and Zinda Pir land sections of the Sulaiman Range, Pakistan . Science Reports of the Institute of Geoscience University of Tsukuba, section B Vol. 22 p. 1-59
Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006):
Atlas of Eocene Planktonic Foraminifera. p. 1-513
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