Glacioloxoconcha jeongokensis, Yoo & Huyen & Chae & Karanovic, 2023
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publication ID |
https://dx.doi.org/10.3897/zookeys.1138.96201 |
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publication LSID |
lsid:zoobank.org:pub:B7224B8C-4808-48B4-A2F7-DDF5EAF204E2 |
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persistent identifier |
https://treatment.plazi.org/id/E7DC6CA1-4CBE-4BCF-8735-2A5C3E3B3372 |
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taxon LSID |
lsid:zoobank.org:act:E7DC6CA1-4CBE-4BCF-8735-2A5C3E3B3372 |
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treatment provided by |
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scientific name |
Glacioloxoconcha jeongokensis |
| status |
sp. nov. |
Glacioloxoconcha jeongokensis sp. nov.
Figs 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6
Material examined.
Holotype, male, dissected on one slide (NIBRIV0000882303) and shell on micropaleontological slide (NIBRIV0000882313); Allotype, female, dissected on one slide (NIBRIV0000882309) and shell on micropaleontological slide (NIBRIV0000882311); Paratypes: one male and one female dissected on each slide, and shell on micropaleontological slides; ~ 20 specimens kept in 2 ml vial in 99% alcohol.
Type locality.
South Korea, Gyeonggi-do, Hwaseong-si, Seosin-myeon, Jeongokhang-ro, Yacht mooring. 37°11.179'N, 126°39.024'E, 25 October 2019, leg. Hyunsu Yoo & Byung-jin Yoo.
Etymology.
The species is named after the yacht mooring place from where it was collected.
Description.
Male. Carapace (Figs 4A View Figure 4 , 6 View Figure 6 ). Relatively small, L ~ 356 µm, H ~ 189 µm. RV overlapping LV dorsally. Carapace subquadrate form in lateral view (Figs 4A View Figure 4 , 6A View Figure 6 ). Anterior margin rounded; dorsal margin straight; postero-dorsal margin with extended caudal process; ventral margin almost straight and inclined gently toward posterior margin; postero-ventral margin with two small spines (Figs 4A View Figure 4 , 6A, F View Figure 6 ). Postero-ventral and anterior margins strongly compressed (Fig. 6A View Figure 6 ). Greatest H situated in front of middle. Eye present. Surface ornamentation consisting of shallow reticulation on postero-dorsal margin, with few simple setae; few sieve-like pores also present (Fig. 6A, B View Figure 6 ). Marginal pore canals distributed on antero-ventral and posterior margins (Fig. 4A View Figure 4 ). Posterior inner lamella wider than anterior. Muscular scar imprints consisting of a row of four vertical scars and one frontal scar. Hinge adont (Fig. 4A View Figure 4 ).
A1 (Fig. 4B View Figure 4 ). Six-segmented. First segment without setulae and setae. Second segment with setulae on antero-distal margin. Third segment with one bare seta antero-distally, reaching end of fourth segment. Fourth and fifth segments each with one bare seta on anterior-distal margin, reaching end of next segment. Terminal segment with three long bare setae on distal margin, almost 2.5 × longer than terminal segment. L ratios between six segments 2.5: 1.1: 1: 1.2: 1.5: 1.4.
A2 (Fig. 4C View Figure 4 ). Four-segmented. Exopod transformed into spinneret seta. First endopodal segment without setulae and seta. Second segment with one bare seta postero-distally reaching 2/3 length of third segment. Third segment with setulae on antero-proximal, postero-medial, and postero-distal margins, and with one bare seta on antero-proximal margin, reaching 1/2 length of the same segment; two bare setae postero-medially, reaching end of the same segment; one bare seta postero-distally, almost 2 × longer than terminal segment. Terminal segment with two strong, bare claws on distal margin almost 3 × longer than the same segment. L ratios between four segments 8.3: 3: 11.3: 1.
Md (Fig. 4F View Figure 4 ). Coxa with seven strong teeth and one thin, bare seta on distal margin, and one bare seta near anterior-distal margin. Exopod with three bare setae; endopod three-segmented. First endopodal segment with one bare seta antero-distally. Second segment with two bare setae antero-distally and one bare seta postero-distally. Terminal segment with nine setae, four of which arise from anterior margin, two from distal margin, and two from postero-distal margin. First segment almost 2 × longer than terminal segment.
Mxl (Fig. 4D, E View Figure 4 ). Palp present. Two-segmented. Terminal segment with four bare setae distally. Exopodite with 1 reflexed seta and ~ 14 bare setae on branchial plate. Masticatory process with three endites, first and second endites each with four bare setae, third endite with two bare setae.
L5 (Fig. 5A View Figure 5 ). Four-segmented. First segment with five bare setae, two antero-medially, one reaching and one not reaching end of the same segment; and two setae antero-distally, reaching 1/2 of second segment; and one postero-proximally, reaching 2/3 length of the same segment. Second segment with one bare seta antero-distally, reaching 1/3 length of the terminal segment. Penultimate segment without any seta. Terminal segment with one claw like seta on distal margin. Last three segments with setulae along anterior margin. L ratios between four segments 3.5: 1.9: 1: 1.4.
L6 (Fig. 5B View Figure 5 ). Four-segmented. First segment with three bare setae, one antero-proximally, reaching 1/2 length of the same segment; one tiny seta; and one antero-distally, reaching 1/5 length of second segment. Second segment with one bare seta antero-distally, reaching 1/3 length of terminal segment. Penultimate segment without any seta. Terminal segment with one claw-like seta on distal margin. Last three segments with setulae along anterior distal margin. L ratios between four segments 3.5: 2.8: 1: 1.8.
L7 (Fig. 5C View Figure 5 ). Four-segmented. First segment with four setae: one bare seta posterior-proximally, as long as 1/4 of the same segment; one bare seta on antero-proximally, as long as 1/4 of the same segment; one plumose seta antero-medially, reaching 1/4 length of second segment; one bare seta antero-distally, reaching 1/2 length of second segment. Second segment with one bare seta on anterior-distal margin, reaching 1/3 length of third segment. Third segment without seta. Terminal segment with one strong claw on distal margin, 1/2 as long as the segment. Last three segments with setulae along anterior margin. L ratios between four segments 3.2: 2: 1: 1.3. Compared with L5 and L6 segments, L7 is more elongated than L5, but similar to L6.
BO (Fig. 4G View Figure 4 ) With more than ten setae on distal margin. Positioned behind L7 and below Hp.
Hp (Fig. 5D View Figure 5 ). Basal plate sub-rectangular. Lobe rudimentary, shaped as a lotus leaf. CR fused with Hp and represented with two setae.
Female. Carapace (Fig. 13A View Figure 13 ). Slightly larger than males. L ~ 382 µm, H ~ 211 µm. Shape and all other morphological features similar to male.
GF (Fig. 5E View Figure 5 ). Basal part rectangular. CR setae not observed. Ovary sub-rectangular.
All other appendages same as in male.
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