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Species Globoturborotalita martini Blow & Banner 1962


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
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)
Specimen:
Natural History Museum, London, Inventory number: P445549
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
Anonymous: Unedited TaxonConcept data
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