Ammolagena clavata ( Jones & Parker, 1860 )

Lee, Somin Lee and Wonchoel, 2020, Five newly recorded foraminifera from off the southern coast of Jeju Island, Korea, Journal of Species Research 9 (4), pp. 473-479 : 476

2. Ammolagena clavata ( Jones & Parker, 1860)

( Plate 1 , fig. 2a -b)

Trochammina irregularis var. clavata Jones and Parker, 1860 .

Webbina clavata : Brady, 1884, p. 349, pl. 41, figs. 12- 16; Wright, 1891, p. 470, pl. 20, figs. 2-3; Goës, 1894, p. 32, pl. 6, figs. 245-246.

Ammolagena clavata : Eimer and Fickert, 1839, p. 673; Cushman, 1910, p. 68, text figs. 86-88; 1918, p. 89, pl. 34, figs. 2-5; pl. 35, figs. 1-3; 1921, p. 61, pl. 6, figs. 1-4; pl. 10, figs. 3-4; Jones, 1994, p. 46, pl. 41, figs. 12-16; Loeblich and Tappan, 1994, p. 14, pl. 4, figs. 1-4; Szarek, 2001, p. 78, pl. 2, fig. 9; Debenay, 2012, p. 75; Hayward et al., 2010, p. 130, pl. 2, figs. 13-14.

Material examined. Korea, off southhern coast of Jeju, St. 7, 33°00 ʹ 00 ʺ N, 127°00 ʹ 00 ʺ E, 5 Aug 2019, by Smith-McIntyre grab, collected by Nayeon Park and Somin Lee. NIBR ID: NIBRPR0000110834, MFORBK ID: MFORB K00332 .

Diagnosis. Test consists of a large, oval proloculus and narrow tubular rectilinear second chamber, and attached to substrate such as shell fragments, sediment particles, or other foraminiferal tests. Wall is finely agglutinated, and surface is smooth, glossy and yellowish-brown in color. Primary aperture is simple, round, and at the end of tubular chamber. Secondary aperture is at the basal end of proloculus and surrounded by slight lip. Test length is about 270 μm, width is about 42 μm including the tubular second chamber.

Remarks. This species is the type species of genus Ammolagena , and this is the first report of the genus in Korea. Ammolagena clavata was originally described as a variety of Trochammina irregularis by Jones and Parker (1860), and later Eimer and Fickert (1839) added the species into the genus Ammolagena . There are three species belonging to the genus Ammolagena and the present species differs from the others in terms of its larger size, less slender, inflated, rounded shape, and much finer particles composing the wall. According to Kaminski and Gradstein (2005), the definition of this species and the genus Ammolagena needs to be amended to consider the presence of a secondary aperture at the basal end. There is no report about the supplementary aperture in the descriptions by Loeblich and Tappan (1987), and the original description by Jones and Parker (1860). However, specimens reported by other researchers often have the secondary aperture at the base ( Wright, 1891). The present specimen also has a secondary aperture at the basal end. The length of the tubular chamber differs from individual to individual. The present specimen has a short tubular chamber, and most similar to the specimen reported by Wright (1891).

Distribution. Korea, China, Japan, New Caledonia, New Zealand, Aegean Sea, Bay of Biscay, Mediterranean Sea, Celtic Sea, Norway, United States.

Figures

Plate 1. Photomicrograph and SEM image of the newly recorded species. 1. Rhabdammina abyssorum Sars in Carpenter, 1869; side view. 2. (a-b) Ammolagena clavata(Jones & Parker, 1860); 2a. Side view; 2b. Side view SEM image; scales: 200 μm. 3. (a-b) Nodosaria lamnulifera Boomgaart, 1950; 3a. Side view; 3b. Side view SEM image. 4. Uvigerina schwageri Brady, 1884; 4a. Side view; 4b. Side view SEM image; scales: 200 μm. 5. (a-c) Neoeponides bradyi (Le Calvez, 1974); SEM image; 5a. Ventral side view; 5b. Spiral side view; 5c. Lateral side view; scales: 200 μm.