Spiroplectammina biformis (Parker & Jones, 1865)

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 : 80-82

8. Spiroplectammina biformis (Parker & Jones, 1865)

( Plate 2. 2 a-c)

Textularia agglutinans var. biformis Parker & Jones ,

1865, p. 370, pl. 15, figs. 23-24 (cited from Ellis & Messina, 1940).

Spiroplecta biformis (Parker & Jones, 1865) : Brady, 1884, p. 376, pl. 45, figs. 25-27 (cited from Debenay, 2013).

Spiroplectammina biformis (Parker & Jones, 1865) : Jones, 1994, p. 50, pl. 45, figs. 25-27; Debenay, 2013, p. 95, 257.

Material examined. Korea, East Sea , station E3 (38°04 ʹ 50.187 ʺ N, 128°42 ʹ 32.872 ʺ E), 20 May 2016, by Van Veen Grab, collected by Raehyuk Jeong and Jisu Yeom. NIBR ID: NIBRPR0000107242 .

Diagnosis. Test free, elongate and narrow. Chamber arrangement planispiral in early portion, later biserial. Wall coarsely agglutinated, with smoothly finished surface, brownish in color, test small, flat and elongated. Aperture a low interiomarginal arch at the base of last chamber.

Remarks. This species was originally classified as a variety of Textularia agglutinans d’Orbigny ( Ellis & Messina, 1940) . Planispiral chamber coiling in early stage and biserial arrangement in later stage are the most typical characteristics of the genus Spiroplectammina . Currently 18 extant species are in the genus. In Korea, there are four recorded species.

Distribution. Korea, China, Japan, South Pacific Ocean, New Zealand, New Caledonia, United States, Bay of Fundy, Canada, Gulf of Saint Lawrence, Vineyard Sound, North Atlantic Ocean, Baltic Sea, Norway, Celtic Sea, English Channel, Scotian Shelf, Southern Ocean, North Western Weddell Sea, King George Island.