Oolina brevisolenia Zheng, 1979

Lee, Somin & Lee, Fabrizio Frontalini and Wonchoel, 2023, A report of three newly recorded benthic foraminiferal species from Korea, Journal of Species Research 12 (1), pp. 48-54 : 53

3. Oolina brevisolenia Zheng, 1979 ( Plate 2 . figs. 5-7)

Oolina brevisolenia, Zheng, 1979 , pp. 148 (Chinese), 213 (English), pl. 12, fig. la - c.

Material examined. Seop-seom Kaldong-gul diving point, Seogwipo, Jeju Island, Korea. 33°14′12.10″N, 126° 35′19.34″E, 3 August 2020, collected by Heerin Kim, Jisu Yeom and Wonchoel Lee. MABIK ID: MABIK PR00044181 ; Sungsan Seom-yeo diving point, Seogwipo Jeju Island, 33°27′21.54″N 126°56′3.06″E, 2 August 2020, by SCUBA diving, collected by Heerin Kim, Jisu Yeom and Wonchoel Lee. MABIK ID: MABIK PR000 44179, MABIK PR00044180 .

Diagnosis. Test unilocular, ovate, tapering toward apertural end, basal end broader and rounded. Surface ornamented with somewhat irregularly distributed, bifurcating longitudinal costae, which extending from basal end to the middle or slightly upper middle part of test. Wall calcareous hyaline, thick, surface smooth except the longitudinal costae. Aperture terminal, radiate, short entosolenian tube at the inner part of apertural end, not extending into the chamber cavity. Test length about 420 μm, width about 350 μm.

Remarks. This species was originally reported by Zheng (1979), from a shallow depth (30 m) near Xisha Islands in the South China Sea. The longitudinal costae, somewhat irregularly spaced and sometimes bifurcating, are the unique feature that distinguishes this species from other congeners. According to the original description ( Zheng, 1979), this species resembles Oolina borealis Loeblich & Tappan, 1954 , in having globose test and longitudinal costae, but O. brevisolenia Zheng, 1979 differs from O. borealis in having tapering apertural end rather than ovate outline, and the longitudinal costae which are irregular, bifurcating, and not extending to the apical end. According to WoRMS (2022), this species has been found and documented only from Chinese waters and this is the second report of O. brevisolenia from other countries except for China. In Korean specimens, there is a slight difference in the number and thickness of costae between individuals.

Distribution. Korea, China.

Figures

Plate 2. Photomicrograph and SEM image of the newly recorded species. All scales are 100 μm unless otherwise noted. 1-4. Hemirotalia foraminulosa Lei and Li, 2016; 1. (a-c) MABIK PR00044175; 1a. Ventral side view, SEM image; 1b. Lateral view, SEM image; 1c. Spiral side view, SEM image. 2. (a-e) MABIK PR00044176; 2a. Ventral side view, SEM image; 2b. Lateral view, SEM image; 2c. Spiral side view, SEM image; 2d. Spiral side view, photomicrograph; 2e. Ventral side view, photomicrograph. 3. (a-f) MABIK PR00044178; 3a. Ventral side view, SEM image; 3b. Lateral view, SEM image; 3c. Spiral side view, SEM image; 3d. Ventral side view, photomicrograph; 3e. Lateral view, photomicrograph; 3f. Spiral side view, photomicrograph; 4. (a, b) MABIK PR00044177; 4a. Ventral side view, photomicrograph; 4b. Lateral view, photomicrograph. 5-7. Oolina brevisolenia Zheng, 1979; 5. (a, b) MABIK PR00044179; 5a. Lateral view, SEM image; 5b. Basal view, SEM image. 6. (a-c) MABIK PR00044180; 6a. Lateral view, SEM image; 6b. Apertural view, SEM image; 6c. Close-up of aperture, SEM image. 7. MABIK PR00044181; Lateral view, photomicrograph under bright field, white arrow pointing entoso- lenian tube.