Globorotalia conoidea Walters

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 : 42

publication ID

https://doi.org/ 10.26879/444

persistent identifier

https://treatment.plazi.org/id/A029445F-E908-FFAD-4A13-BBD57170A079

treatment provided by

Felipe

scientific name

Globorotalia conoidea Walters
status

 

Globorotalia conoidea Walters View in CoL

Figures 15.5, 15.6 View FIGURE 15

1965 Globorotalia miozea conoidea Walters , p. 124, fig. 8.

1974 Globorotalia aff. cibaoensis Ujiié and Ōki , pl. 5, figs. 1—4.

1977 Globorotalia miozea conoidea Walters — Berggren, p. 298, pl. 2, figs. 9—31.

1978 Globorotalia miozea conoidea Walters — Keller (a), pl. 1, figs. 7—10.

1983 Globorotalia (Globoconella) conoidea Walters — Kennett and Srinivasan, p. 112, pl. 26, figs. 4—6.

1985 Globorotalia (Globorotalia) miozea conoidea Walters — Ibaraki, p. 132, pl. 10, figs. 12—14.

1985 Globorotalia (s.s.) aff. pliozea Hornibrook — Ujiié, p. 113, pl. 14, figs. 5—7.

1985 Globorotalia conoidea Walters — Jenkins, p. 276, figs. 7.14, 7.15.

Remarks. Specimens from Miyakojima Island exhibit a transitional form between G. conoidea and Globorotalia conomiozea . It has four chambers in the final whorl similar to G. conomiozea , while the umbilical side is less vaulted than typical G. conoidea as figured by Kennett and Srinivasan (1983). Natori (1976, table 2) showed in his range chart that G. conomiozea evolved into G. conoidea ; whereas Kennett and Srinivasan (1983) noted the opposite and showed that G. conoidea disappeared in the uppermost Miocene. In Miyakojima Island, G. conomiozea disappears earlier than G. conoidea as noted by Natori (1976) in Okinawa-jima, both in the Pliocene. Based on those reports, it can be stated that G. conoidea and G. conomiozea are potentially useful indicators of the upper Miocene to lower Pliocene of subtropical to temperate seas, but their ranges vary between areas, and further stratigraphic studies are called for.

Occurrence. Common in the upper part of the Yonahama Formation.

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