Islandiella helenae Feyling-Hanssen and Buzas, 1976
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 |
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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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