Islandiella helenae Feyling-Hanssen and Buzas, 1976

Setoyama, Eiichi & Kaminski, Michael A., 2015, Neogene benthic foraminifera from the southern Bering Sea (IODP Expedition 323), Palaeontologia Electronica (International ed. in English) 76 (4), pp. 1-30 : 7

publication ID

https://doi.org/ 10.26879/462

persistent identifier

https://treatment.plazi.org/id/E77A8793-FFE2-404A-C90B-FC1EEC93FAD6

treatment provided by

Felipe

scientific name

Islandiella helenae Feyling-Hanssen and Buzas, 1976
status

 

Islandiella helenae Feyling-Hanssen and Buzas, 1976 View in CoL

Figures 3.13a–d View FIGURE 3 , 5.2a–c View FIGURE 5 , 8.6 View FIGURE 8

1976 Islandiella helenae Feyling-Hanssen and Buzas : p. 155, figs. 1–4.

1980 Islandiella helenae Feyling-Hanssen and Buzas ; Rodrigues, Hooper, and Jones, p. 49, pl. 1, figs. 1, 3, 5, pl. 4, figs 3, 6, 9, pl. 6, figs. 1, 2.

1983b Islandiella helenae Feyling-Hanssen and Buzas ; Nomura, p. 16, pl. 2, figs. 4a–c, 5a–c, pl. 7, figs. 11, 12, pl. 8, figs 1, 2.

1999 Planocassidulina helenae (Feyling-Hanssen and Buzas) ; Nomura, p. 51, figs. 33- 1a-c, -2a-c, 36-1, -2.

Remarks. The size and the convexity of test vary greatly among specimens. The identification criteria of the species in this study follow Nomura (1983b), and it is distinguished from Islandiella norcrossi ( Cushman, 1933) by possessing roundedrhomboid to oval chambers, but not triangular chambers in mature specimens, and the different position of the aperture. Although the species was transferred to the genus Planocassidulina Gudina (1966) emended by Nomura (1999) from Islandiella by Nomura (1999) based on the acute and sometimes almost keeled periphery of I. helenae and I. norcrossi , the angle of periphery often varies among specimens, and they do not possess a proper keel. We therefore retain the species in the genus Islandiella .

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