Two New Species of <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from Subtidal Benthic Habitats in Korea, with a Comparative Analysis of Cephalic Setae Variability
This study describes two new species of the subgenus <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from subtidal benthic habitats in Korea, located in the Northwestern Pacific Ocean. Both species are distinguished by the absence of cephalic setae—a rare feature previously documented in...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
|
| Series: | Journal of Marine Science and Engineering |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-1312/12/12/2168 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850241867764989952 |
|---|---|
| author | Wooin Jung Ji-Hoon Kihm Hyun Soo Rho |
| author_facet | Wooin Jung Ji-Hoon Kihm Hyun Soo Rho |
| author_sort | Wooin Jung |
| collection | DOAJ |
| description | This study describes two new species of the subgenus <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from subtidal benthic habitats in Korea, located in the Northwestern Pacific Ocean. Both species are distinguished by the absence of cephalic setae—a rare feature previously documented in only three species within this subgenus: <i>Desmoscolex</i> (<i>Desmoscolex</i>) <i>rostratus</i> Timm, 1970; <i>D.</i> (<i>D</i>.) <i>asetosus</i> Decraemer, 1975; and <i>D</i>. (<i>D</i>.) <i>obscurus</i> Bussau, 1993. The new species exhibit distinct morphological features. <i>Desmoscolex</i> (<i>D</i>.) <i>lanceosetatus</i> sp. nov. is characterized by an asymmetrical, dorsally curved head; large amphidial fovea that extend to the posterior margin of the first main ring; and lance-shaped subdorsal setae. In females, the absence of subventral setae on the 14th ring deviates from the typical arrangement of 17 main rings. <i>Desmoscolex</i> (<i>D</i>.) <i>rotundicephalus</i> sp. nov. is identified by its globular head, oval amphidial fovea, and tapering subdorsal setae with an open tip. In females, the absence of subventral setae on the 14th ring further differentiates it from closely related species. This paper provides detailed morphological descriptions supported by scanning electron microscopy (SEM) and differential interference contrast (DIC) images. Additionally, it includes a comprehensive morphological comparison with previously described species, species diagnoses, and a pictorial key for identification. |
| format | Article |
| id | doaj-art-4917f30dda2c4ab2884cd3544f0482d7 |
| institution | OA Journals |
| issn | 2077-1312 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-4917f30dda2c4ab2884cd3544f0482d72025-08-20T02:00:28ZengMDPI AGJournal of Marine Science and Engineering2077-13122024-11-011212216810.3390/jmse12122168Two New Species of <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from Subtidal Benthic Habitats in Korea, with a Comparative Analysis of Cephalic Setae VariabilityWooin Jung0Ji-Hoon Kihm1Hyun Soo Rho2East Sea Environment Research Center, Korea Institute of Ocean Science and Technology (KIOST), Uljin 36315, Republic of KoreaDivision of Glacier & Earth Sciences, Korea Polar Research Institute (KOPRI), Yeonsu-gu, Incheon 21990, Republic of KoreaEast Sea Environment Research Center, Korea Institute of Ocean Science and Technology (KIOST), Uljin 36315, Republic of KoreaThis study describes two new species of the subgenus <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from subtidal benthic habitats in Korea, located in the Northwestern Pacific Ocean. Both species are distinguished by the absence of cephalic setae—a rare feature previously documented in only three species within this subgenus: <i>Desmoscolex</i> (<i>Desmoscolex</i>) <i>rostratus</i> Timm, 1970; <i>D.</i> (<i>D</i>.) <i>asetosus</i> Decraemer, 1975; and <i>D</i>. (<i>D</i>.) <i>obscurus</i> Bussau, 1993. The new species exhibit distinct morphological features. <i>Desmoscolex</i> (<i>D</i>.) <i>lanceosetatus</i> sp. nov. is characterized by an asymmetrical, dorsally curved head; large amphidial fovea that extend to the posterior margin of the first main ring; and lance-shaped subdorsal setae. In females, the absence of subventral setae on the 14th ring deviates from the typical arrangement of 17 main rings. <i>Desmoscolex</i> (<i>D</i>.) <i>rotundicephalus</i> sp. nov. is identified by its globular head, oval amphidial fovea, and tapering subdorsal setae with an open tip. In females, the absence of subventral setae on the 14th ring further differentiates it from closely related species. This paper provides detailed morphological descriptions supported by scanning electron microscopy (SEM) and differential interference contrast (DIC) images. Additionally, it includes a comprehensive morphological comparison with previously described species, species diagnoses, and a pictorial key for identification.https://www.mdpi.com/2077-1312/12/12/2168marineSEM and DIC imagingnorthwestern Pacific Oceanbiodiversitytaxonomy |
| spellingShingle | Wooin Jung Ji-Hoon Kihm Hyun Soo Rho Two New Species of <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from Subtidal Benthic Habitats in Korea, with a Comparative Analysis of Cephalic Setae Variability Journal of Marine Science and Engineering marine SEM and DIC imaging northwestern Pacific Ocean biodiversity taxonomy |
| title | Two New Species of <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from Subtidal Benthic Habitats in Korea, with a Comparative Analysis of Cephalic Setae Variability |
| title_full | Two New Species of <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from Subtidal Benthic Habitats in Korea, with a Comparative Analysis of Cephalic Setae Variability |
| title_fullStr | Two New Species of <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from Subtidal Benthic Habitats in Korea, with a Comparative Analysis of Cephalic Setae Variability |
| title_full_unstemmed | Two New Species of <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from Subtidal Benthic Habitats in Korea, with a Comparative Analysis of Cephalic Setae Variability |
| title_short | Two New Species of <i>Desmoscolex</i> (Nematoda: Desmoscolecidae) from Subtidal Benthic Habitats in Korea, with a Comparative Analysis of Cephalic Setae Variability |
| title_sort | two new species of i desmoscolex i nematoda desmoscolecidae from subtidal benthic habitats in korea with a comparative analysis of cephalic setae variability |
| topic | marine SEM and DIC imaging northwestern Pacific Ocean biodiversity taxonomy |
| url | https://www.mdpi.com/2077-1312/12/12/2168 |
| work_keys_str_mv | AT wooinjung twonewspeciesofidesmoscolexinematodadesmoscolecidaefromsubtidalbenthichabitatsinkoreawithacomparativeanalysisofcephalicsetaevariability AT jihoonkihm twonewspeciesofidesmoscolexinematodadesmoscolecidaefromsubtidalbenthichabitatsinkoreawithacomparativeanalysisofcephalicsetaevariability AT hyunsoorho twonewspeciesofidesmoscolexinematodadesmoscolecidaefromsubtidalbenthichabitatsinkoreawithacomparativeanalysisofcephalicsetaevariability |