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Species Streptochilus martini Pijpers 1933


Diagnosis / Definition:
Pearson et al. (2006):
DESCRIPTION. Type of wall: Microperforate, though low latitude forms may have macroperforations, smooth to finely pustulose. Test morphology: Test elongate, somewhat compressed, sometimes slightly twisted, gradually to moderately tapering, peripheral margin subrounded; chambers biserial, increasing gradually in size, sutures flush to slightly depressed and oblique in first two to three pairs of chambers, later more strongly depressed and nearly horizontal; aperture a semicircular arch with a thin lip that projects on one side more than the other and an internal toothplate that connects foramina of successive chambers. Size: Holotype length 0.21 mm, width 0.13 mm, breadth 0.09 mm; length range 0.15-0.22 mm.
Discussion / Comments:
Pearson et al. (2006):
DISTINGUISHING FEATURES.- Distinguished from Chiloguembelina ototara and Chiloguembelina crinita by the more compressed and tapering test and smoother test surface. DISCUSSION- It is not clear what criteria Beckmann (1957) used to distinguish his species Chiloguembelina victoriana Beckmann (see holotype, PI. 16.3, Figs. 1-2) from his concept of C. martini, as his examples of morphologic variability for the two species show considerable overlap in test elongation and degree of chamber appression. The illustrated hypotypes (Pl. 16.3, Figs. 3-8) show a similar variability. For this reason, and because of priority, C. victoriana is considered a junior synonym of S. martini. Samanta (1973) distinguished his species Chiloguembelina woodi from S. martini by the presence of more globular chambers and by possessing a broader, subcircular, symmetrical aperture. We unite these taxa here in the absence of detailed information on how these characters vary in populations of S. martini. PHYLOGENETIC RELATIONSHIPS.- Probably derived from Chiloguembelina crinita during the middle Eocene. STRATIGRAPHIC RANGE.- Middle Eocene Zone E l0 to lower Oligocene Zone O1. Liu and others (1 997) recorded the range of C. victoriana (= S. martini) from Zone P 12 (-Zone E l l) through Zone P 16 (=Zone E 15) in the Atlantic City borehole (New Jersey Coastal Plain Drilling Project). Resig (1993) recorded the H0 of S. martini in middle Zone P18 (=01) at ODP Sites 806 and 807 (Ontong Java Plateau), but the L0 was not recovered at those sites. GEOGRAPHIC DISTRIBUTION.- Cosmopolitan. STABLE ISOTOPE PALEOBIOL0GY.- No data available. REPOSITORY.- Mineralogische Geologische Instituut, State University, Utrecht, The Netherlands.
Systematics:

35
 Ordo Foraminiferida
  Superfamilia Globigerinaceae
   Familia Chiloguembelinidae
    Genus Streptochilus
     Species Streptochilus martini
Synonym list:
Pearson et al. (2006):
1933 Textularia martini Pijpers. - Pijpers : p.57 fig. 6-10 [upper Eocene, Bonaire, D.W.I.]
1933 Guembelina goodwini Cushman & Jarvis. - Cushman : p.69 pl. 7; fig. 15-16 [upper Eocene, Trinidad]
1935 Guembelina venezuelana Nuttall. - Nuttal : p.126 pl. 15; fig. 2-4 [upper Eocene, Bolivar District, Venezuela]
1939 Guembelina mauriciana Howe & Roberts. - Howe : p.62 pl. 8; fig. 9-11 [Eocene Cook Mountain Fm., Louisiana]
1953 Guembelina martini Pijpers. - Drooger : p.100 pl. 1, fig. 2; text-fig. 4 [upper Eocene, Curacao and Bonaire]
1957 Guembelina tenuis Todd. - Todd : p.303 pl. 65; fig. 31.a, b [upper Eocene, Saipan, Mariana Islands]
1957 Chiloguembelina martini Pijpers. - Beckmann : p.89 pl. 21; text-fig. 14(9-11, 14-18, 20-23) [Eocene, upper Lizard Springs, Navet and San Fernando Fms., Trinidad]
1957 Chiloguembelina victoriana Beckmann. - Beckmann : pl. 21, fig. 19, 20; text-fig. 15(46-48) [upper Eocene, San Fernando, Trinidad]
1969 Chiloguembelina martini Pijpers. - Hartono : p.157 pl. 20; fig. 1 [upper Eocene, Nanggulan, central Java]
1973 Chiloguembelina woodi Samanta. - Samanta : p.432 pl. 15; fig. 15-16 [middle Eocene, Zone P12, Sulaiman Range, Pakistan]
1985 Streptochilus martini Pijpers. - Poore & Gosnell : pl. 1; fig. 1-7 [upper Eocene, DSDP 522-37-CC, South Atlantic]
1993 Streptochilus martini Pijpers. - Resig : pl. 1; fig. 11-12, 14-16, 18 [upper Eocene, Zone P17, ODP Hole 807C, Ontong-Java Plateau]
2001 Chiloguembelina martini Pijpers. - Warraich & Ogasawara : p.13 fig. 3(1-2) [middle Eocene, Zones P 12-P 14, Sulaiman Range, Pakistan]
2001 Chiloguembelina goodwini Cushman & Jarvis. - Warraich & Ogasawara : p. 11-13 fig. 3(9-10) [middle-upper Eocene, Sulaiman Range, Pakistan]
2001 Chiloguembelina victoriana Beckmann. - Warraich & Ogasawara : p. 13-15 fig. 3(3-4) [middle Eocene, Zone P 12, Sulaiman Range, Pakistan]
2001 Chiloguembelina woodi Samanta. - Warraich & Ogasawara : p.15 fig. 3(11-12) [middle Eocene, Zones P 12-P1 4, Sulaiman Range, Pakistan]
2006 Streptochilus martini Pijpers. - Pearson et al. : p.480 pl. 13.3; fig. 1-8 (Pl. 16.3, Figs. 1,2: new SEMs of holotype of Chiloguembelina victoriana Beckmann)
References:

Cushman,J.A. (1933):
Some new foraminiferal genera . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 9 p. 32-37

Pijpers,P.J. (1933):
Geology and Paleontology of Bonaire (D. W. I.) . Univ. Utrecht Geogr. Geol. Med., Phys.- Geol. Reeks Vol. 8 p. 1-103

Nuttal,W.L.F. (1935):
Upper Eocene Foraminifera from Venezuela . Journ. Paleontol. Vol. 9 p. 121-131

Howe,H.V. (1939):
Louisiana Cook Mountain Eocene Foraminifera. Louisiana Dep. Cons. . Geol. Surv. Bull. Vol. 14 p. 1-122

Drooger,C.W. (1953):
Late Eocene smaller Foraminifera from Curacao and Bonaire (N. W. I.) . Proc. Nederl. Akad. Wetenschappen, ser. B Vol. 56(1) p. 93-103

Todd,R. (1957):
Smaller foraminifers.
In: Geology of Saipan, Mariana Islands (Pt. 3) Paleontology, US. Geological Survey Professional Papers280-H p. 265-320

Beckmann,J.P. (1957):
Chiloguembelina Loeblich and Tappan and Related Foraminifera from the Lower Tertiary.
In: Studies in Foraminifera, United States National Museum Bulletin Vol. 215 Eds: Loeblich, A.R.et al. p. 83-95

Hartono,H.M.S.. (1969):
Globigerina marls and their planktonic foraminifera from the Eocene of Nanggulan, Central Java . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 20 p. 152-159

Samanta,B.K. (1973):
Planktonic foraminifera from the Palaeocene-Eocene succession in the Rakhi Nala, Sulaiman Range, Pakistan . British Museum Natural History Bulletin Vol. 22(6) p. 436

Poore,R.Z. and Gosnell,L.B.. (1985):
Apertural features and surface texture of upper Paleogene biserial planktonic foraminifers; Links between Chiloguembelina and Streptochilus . Journal of Foraminiferal Research Vol. 15 p. 1-5

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

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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