Neogloboquadrina pseudopachyderma (Cita, Premoli-Silva, and Rossi)

Hanagata, S & Nobuhara, T, 2015, Illustrated guide to Pliocene foraminifera from Miyakojima, Ryukyu Island Arc, with comments on biostratigraph, Palaeontologia Electronica (Cambridge, England) 33 (8), pp. 1-142 : 51

publication ID

https://doi.org/ 10.26879/444

persistent identifier

https://treatment.plazi.org/id/A029445F-E915-FFB0-4BCA-BE2476F6A1CB

treatment provided by

Felipe

scientific name

Neogloboquadrina pseudopachyderma (Cita, Premoli-Silva, and Rossi)
status

 

Neogloboquadrina pseudopachyderma (Cita, Premoli-Silva, and Rossi) View in CoL

Figures 17.15-17.17 View FIGURE 17

1965 Globorotalia pseudopachyderma Cita, Premoli-Silva, and Rossi , p. 233, pl. 20, figs. 3, 4, 6, pl. 31, fig. 6, p. 235, text-fig. 5.

1974 Globigerina pseudopachyderma Cita, Premoli-Silva, and Rossi — Olsson, pl. 2, figs. A—J.

1975 Neogloboquadrina atlantica (Berggren) — Poore and Berggren, pl. 1, fig. 8—13, pl. 2, fig. 7.

1985 Neogloboquadrina pachyderma (Ehrenberg) — Ibaraki, p. 138, pl. 13, figs. 3, 4.

2000 Neogloboquadrina inglei Kucera and Kennett , p. 80, pl. 1, figs. 1—13.

2003 Neogloboquadrina incompta (Cifelli) View in CoL — Ujiié, p. 41, pl. 1, fig. 2 (non Globigerina incompta Cifelli, 1961 ).

2004 Neogloboquadrina incompta (Cifelli) View in CoL — Hanagata, pl. 2, figs. 1, 2.

Remarks. Almost all specimens from the Pliocene of Miyakojima Island exhibit dextral coiling except for a single specimen from sample 2-2 of the Minebari Formation which is sinistral.

There have been extensive taxonomic studies of the morphological variations of N. pachyderma and related species, including N. borealis [= Globigerina bulloides d’Orbigny var. borealis Brady,

1881, first referred to as Globigerina bulloides arctic variety by Brady, 1878, p. 435, pl. 21, fig. 10; also reprinted as N. pachyderma by Jones, 1994, p. 113, pl. 114, figs. 19, 20], N. pseudopachyderma , N. incompta , N. atlantica [= Globigerina atlantica Berggren, 1972 , pp. 972, 973, pl. 1, fig. 1—7; Poore and Berggren, 1975], and N. inglei . In addition, attempts have been made to distinguish morphotypes based on wall calcification/encrustation, chamber inflation, lobulation, or test size (e.g., Kennett, 1968; Bandy, 1972; Srinivasan and Kennett, 1974; Reynolds and Thunell, 1986; Bergami et al., 2009; Eynaud et al., 2009). However, the relationship among these species is still confused. For example, it is speculated that Poore and Berggren (1975) included N. pseudopachyderma and N. incompta , and also Neogloboquadrina praehumerosa (as here understood) in their N. atlantica , as judged from their illustrations.

Among those studies, Keller (1978b) regarded incompta and puseudopachyderma as morphotypes of N. pachyderma , focusing on test size assuming the differences in test shape mirrored growing stages. Her work should be valued for treating incompta and pseudopachyderma in the discussion; later work did not even mention those species.

Recent molecular study, based on r-DNA, is expected to resolve this problem (e.g., Darling et al., 2006, 2007). So far, DNA extraction and morphological classification have not been properly combined in previous studies.

Occurrence. Dextral specimens are common in the Onogoshi and Minebari formations. A single sinistral specimen is available from the Minebari Formation.

Kingdom

Chromista

Phylum

Foraminifera

Class

Globothalamea

Order

Rotaliida

Family

Globorotaliidae

Genus

Neogloboquadrina

Loc

Neogloboquadrina pseudopachyderma (Cita, Premoli-Silva, and Rossi)

Hanagata, S & Nobuhara, T 2015
2015
Loc

Globigerina incompta

Cifelli 1961
1961
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