Glacioloxoconcha jisepoensis, Yoo & Huyen & Chae & Karanovic, 2023

Yoo, Hyunsu, Huyen, Pham Thi Minh, Chae, Jinho & Karanovic, Ivana, 2023, Three Loxocaudinae species (Ostracoda, Podocopida) from South Korea, ZooKeys 1138, pp. 183-209 : 183

Glacioloxoconcha jisepoensis sp. nov.

Figs 7 , 8

Material examined.

Holotype, male, dissected on one slide (MABIKCR0025819); Allotype, female, dissected on one slide (MABIKCR0025820); Paratypes: one male and female dissected on each slide, and shell on each micropaleontological slide and 5 specimens kept in 2 ml vial.

Type locality.

South Korea, Gyeongsangnam-do, Geoje-si, Irun-myeon, Jisepohaean-ro, Jisepo harbor. 34°49.919'N, 128°42.220'E, 19 May 2020, leg. Hyunsu Yoo & Byung-jin Yoo.

Etymology.

The species is named after the harbor from where it was collected.

Description.

Male. Carapace (Figs 7C , 8 ). Relatively small, L ~ 400 µm, H ~ 220 µm. RV overlapping LV dorsal margin (Fig. 8C ). Carapace similar to that of G. jeongokensis . Some differences are that dorsal margin is slightly sloped (Fig. 8A, B ), and the caudal process is slightly longer than that of G. jeongokensis (Fig. 8D ). Anterior and posterior pore channel well developed (Fig. 7C ). Muscular imprint same as G. jeongokensis (Figs 7C , 8B ). Hinge adont (Fig. 7C ).

A1 (Fig. 4A ). Six-segmented. First segment without setulae or setae. Second segment with one bare seta postero-distally reaching 1/2 length of fourth segment. Third segment with one bare seta antero-distally reaching end of fourth segment. Fourth segment with one bare seta antero-distally reaching 1/3 length of terminal segment. Fifth segment with two bare setae on anterior-distal margin almost 2 × longer than terminal segment, one bare seta postero-distally almost 2 × longer than terminal segment. Terminal segment with three long bare setae on distal margin, almost 3.5 × longer than terminal segment. L ratios between six segments 1.4:1.2:1:1.2:1.3:1.3.

Md (Fig. 7B, B '). Coxa slightly crushed shape with four strong teeth and two thin bare setae on distal margin and one bare seta near anterior distal margin. Exopod with three bare setae; endopod three-segmented. First segment with one bare seta antero-distally. Second segment with two bare setae antero-distally and one bare seta postero-distally. Terminal segment with ten setae, four of which arise from anterior margin, four from distal margin and two from postero-distal margin. First segment almost 2 × longer than terminal segment.

Hp (Fig. 7D ). Similar to G. jeongokensis but smaller. CR lost.

Other appendages same as in G. jeongokensis sp. nov.

A2 Four-segmented. L ratios between four segments 10: 3.5: 12.3: 1.

L5 Four-segmented. L ratios between four segments 3.6: 2: 1: 1.4.

L6 Four-segmented. L ratios between four segments 3.4: 2.2: 1: 1.4.

L7 Four-segmented. L ratios between four segments 3.6: 2.9: 1: 1.8.

Female. Carapace broken.

GF (Fig. 5E ). Basal part rectangular form. Three bare setae of CR observed. Ovary sub-rectangular.

All other appendages same as in male.

Figures

Figure 4. Glacioloxoconcha jeongokensis sp. nov.: male (NIBRIV 0000882303, NIBRIV 0000882313 holotype) A LV internal view B A 1 C A 2 D endopodite of Mxl E vibratory organ F Md G BO. Scale bars: 50 µm (B-F); 100 µm (A).

Figure 5. Glacioloxoconcha jeongokensis sp. nov.: male (NIBRIV 0000882303 holotype) A L 5 B L 6 C L 7 D Hp; female (NIBRIV 0000882309 allotype) E GF. Scale bar: 50 µm.

Figure 7. Glacioloxoconcha jisepoensis sp. nov.: male (MABIKCR 0025819) A A 1 B Md B ' terminal segment of endopod C RV internal view D Hp, female (MABIKCR 0025820) E GF. Scale bars: 50 µm (A, B, B', D, E); 100 µm (C).

Figure 8. SEM photographs of Glacioloxoconcha jisepoensis sp. nov.: male (paratype) A RV external view B LV internal view, male (paratype) C dorsal view D postero dorsal margin E RV internal view F posterior ventral margin.