Polymorphina subelliptica McCulloch, 1977

Lee, Sue Yeon, Yoo, Jung Sun & Kim, Seung Tae, 2017, Thirty new records of marine benthic Foraminifera from Korean waters, Journal of Species Research 6, pp. 75-93 : 88

25. Polymorphina subelliptica McCulloch, 1977

( Plate 5. 3 a-c)

Polymorphina subelliptica McCulloch, 1977, p. 173 , pl.

78, figs. 1-3, 8-10, 14.

Material examined. Korea, East Sea , station E8 (37°23 ʹ 55.665 ʺ N, 129°14 ʹ 57.671 ʺ E), 21 May 2016, by Van Veen Grab, collected by Raehyuk Jeong and Jisu Yeom. NIBR ID: NIBRPR0000107252 .

Diagnosis. Test free, elongate, periphery lobate, and initial end accurately rounded. Chambers longer than wid- er, biserial arranged with an initial, extra chamber followed by later chambers overlapping on the raised half of sigmoid form. Chambers of depressed half of each biserial series more elongate. Sutures distinct, oblique, curved and depressed. Wall calcareous, hyaline, surface smooth and glossy. Aperture terminal, radiate, slightly produced with compressed end.

Remark. According to McCulloch (1977), the microspheric form of this species has an acutely rounded initial end and an extra chamber in the initial part followed by additional accurate shaped chambers in a position overlapping on the raised half. Our specimen seems to be a microspheric form. The genus Polymorphina can be confused with the genus Guttulina , but in Guttulina , chambers are added spirally in five planes, whereas Polymorphina has a biserial chamber arrangement.

Distribution. Korea, Eastern Pacific.