Taxon Concept provided by | |
Home | Search |
TaxonConcept data set details: | ||||||
Back to Search | ||||||
Anonymous: Unedited TaxonConcept data | ||||||
Notice: This catalogue page may contain unedited data.
To find validated information on this taxon please visit the following project pages: | ||||||
Species Neogloboquadrina acostaensis Blow 1959 | ||||||
|
||||||
Diagnosis / Definition: | ||||||
Kennett & Srinivasan (1983): Test low trochospiral, equatorial periphery strongly lobulate, axial periphery rounded; chambers inflated, subspherical to ovate, five to five and one-half in the final whorl; sutures on spiral and umbilical sides radial, depressed; surface distinctly reticulate with large circular pores and pore pits (PI. 47, Fig. 1); umbilicus narrow, deep; aperture interiomarginal, xtraumbilical-umbilical, a rather low arch with distinct rim or in the form of apertural plate covering much of the umbilicus. |
||||||
Discussion / Comments: | ||||||
Kennett & Srinivasan (1983): N. acostaensis is distinguished from the phylogenetically unrelated form Gr. (J.) siakensis by its more inflated chambers, low aperture, and distinct apertural plate. Chaisson & Pearson (1997): Kennett and Srinivasan (1983) show an early Pliocene extinction for this species. Berggren et al. (1985) give an age of 5.1 Ma (transformed to Leg 154 time scale) for its LO, an event that was verified by Chaisson and Leckie (1993) in the western equatorial Pacific. Bolli and Saunders (1985) show a stratigraphic range that extends to the Recent. The LO at Site 925 is at approximately the Pliocene/Pleistocene boundary. Either this species has a very diachronous LO or there are taxonomic difficulties, as suggested by Loubere and Moss (1986) with their designation of a acostaensis-pachyderma intergrade. In Samples 154-925B-7H-5, 65-67 cm, and 4H-6, 65-67 cm, both N. acostaensis and N. acostaensispachyderma intergrade are more abundant than the “dutertrei” morphotype. Chaisson & Leckie (1993): Remarks: Many specimens of this species found at this site are relatively large, more nearly the size of Neogloboquadrina humerosa. Similar species: Large specimens resemble N. humerosa, but the latter species lacks an apertural flap, its aperture is more open, and it usually has six chambers in the final whorl (e.g., see Plate 8, Fig. 6). N. acostaensis differs from Globorotalia challengeri in possessing an apertural flap or kümmerformlike final chamber, and in being uniformly perforate. See G. challengeri. |
||||||
Systematics: | ||||||
1 Superregnum Eukaryota Regnum Protoctista Phylum Ciliophora Subphylum Postciliodesmatophora Ordo Globigerinida Superfamilia Globorotaliaceae Superfamilia Nonionacea Familia Globorotaliidae Genus Neogloboquadrina Species Neogloboquadrina acostaensis |
||||||
Synonym list: | ||||||
Kennett & Srinivasan (1983): 1959 Globorotalia acostaensis Blow. - Blow : p.208 pl 17 figs 106a-c
Chaisson & d'Hondt (2000): 1959 Globorotalia acostaensis Blow. - Blow : p.208 pl 17 figs 106a-c
1983 Neogloboquadrina acostaensis Blow. - Kennett & Srinivasan : p.196 pl 47 figs 1-3
Chaisson & Pearson (1997): 1959 Globorotalia acostaensis Blow. - Blow : p.208 pl. 17; fig. 106a-c
1983 Neogloboquadrina acostaensis Blow. - Kennett & Srinivasan : p.196 pl. 47; fig. 1
pl. 48; fig. 1-3
1997 Neogloboquadrina acostaensis Blow. - Chaisson & Pearson : p.31 pl. 2; fig. 24
Vincent & Toumarkine (1990): 1959 Globorotalia acostaensis Blow. - Blow : p.208 pl.17, fig.106
1990 Neogloboquadrina acostaensis Blow. - Vincent & Toumarkine : p.836 pl.7, figs.3-6, 10-11
Chaisson & Leckie (1993): 1959 Globorotalia acostaensis Blow. - Blow : p.208 pl. 17; fig. 106a-c
1983 Neogloboquadrina acostaensis Blow. - Kennett & Srinivasan : p.196 pl. 47, fig. 1;
pl. 48, fig. 1-3
1993 Neogloboquadrina acostaensis Blow. - Chaisson & Leckie : p.176 pl. 8; fig. 5
|
||||||
Stratigraphy - absolute ages: | ||||||
S-D: 6.2 ± 0 [Ma], Berggren et al. (1995) D-S: 6.6 ± 0 [Ma], Berggren et al. (1995) FAD: 10.9 ± 0 [Ma], Berggren et al. (1995) FAD: 10.3 ± 0.01 [Ma], Chaisson & d'Hondt (2000) ODP Leg 165 Site 999 LAD: 1.58 ± 0 [Ma], Chaisson & Pearson (1997) ODP Leg 154 Site 925 FAD: 9.82 ± 0 [Ma], Chaisson & Pearson (1997) ODP Leg 154 Site 925 FAD: 9.89 ± 0 [Ma], Turco et al. (2002) ODP Leg 154 Site 926 |
||||||
References: | ||||||
Blow,W.H. (1959): Kennett,J. and Srinivasan,M.S. (1983): Vincent,E. and Toumarkine,M. (1990): Chaisson,W.P. and Leckie,R.M. (1993): Berggren,W.A.; Kent,D.V.; Swisher,C.C. and Aubry,M.P. (1995): Chaisson,W.P. and Pearson,P.N. (1997): Chaisson,W.P. and d'Hondt,S.L. (2000): Turco,E.; Bambini,A.M.; Foresi,L.; Iaccarino,S.; Lirer,F.; Mazzei,R. and Salvatorini,G. (2002): |
||||||
Anonymous: Unedited TaxonConcept data | ||||||
This work is licensed under a Creative Commons Attribution 2.5 License. | ||||||
Back to Search | ||||||
Taxon relations
Ranking (experimental) |