Taxonomic Study of Free-Living Marine Nematodes in the Subgenus <i>Tricoma</i> (Desmoscolecida: Desmoscolecidae) from the Subtidal Zone of the East Sea, Korea, with Insights into the Ultrastructure of the Lip Region
This study provides a taxonomic analysis of three newly discovered species of free-living marine nematodes in the subgenus <i>Tricoma</i> from the East Sea, Korea. <i>Tricoma</i> (<i>Tricoma</i>) <i>polyringulata</i> sp. nov. is characterized by its re...
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2024-12-01
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| author | Hyo Jin Lee Heegab Lee Hyun Soo Rho |
| author_facet | Hyo Jin Lee Heegab Lee Hyun Soo Rho |
| author_sort | Hyo Jin Lee |
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| description | This study provides a taxonomic analysis of three newly discovered species of free-living marine nematodes in the subgenus <i>Tricoma</i> from the East Sea, Korea. <i>Tricoma</i> (<i>Tricoma</i>) <i>polyringulata</i> sp. nov. is characterized by its relatively small body size, with lengths of 280–370 µm in males and 320–390 µm in females, and 75–89 main rings. Diagnostic features include an uncovered first ring, triangular head shape, amphidial fovea with slight constriction, and a unique pattern of somatic setae, comprising 7–9 subdorsal and 8–12 subventral setae. <i>Tricoma</i> (<i>Tricoma</i>) <i>fortiseta</i> sp. nov. is distinguished by 65–69 main rings, 10–12 subdorsal setae, and 17–20 subventral setae, along with a hexagonal head, a well-defined labial region with six lips, and bifid-tipped cephalic setae located medially on the head. <i>Tricoma</i> (<i>Tricoma</i>) <i>uljinensis</i> sp. nov. exhibits 67–70 main rings, with a thick, sclerotized head that is 1.5 times as wide as its length, gently triangular in shape. Its diagnostic features include a gubernaculum bent downward near its midpoint and a conical terminal ring, with 25–39% of the desmos covered. Detailed morphological descriptions of each species are provided, along with a comparative table of morphological traits for species with 61–75 main rings and an illustrated key for identification. |
| format | Article |
| id | doaj-art-48d2b436566645df91bf4a995841df5f |
| institution | Kabale University |
| issn | 2077-1312 |
| language | English |
| publishDate | 2024-12-01 |
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| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-48d2b436566645df91bf4a995841df5f2024-12-27T14:33:33ZengMDPI AGJournal of Marine Science and Engineering2077-13122024-12-011212231010.3390/jmse12122310Taxonomic Study of Free-Living Marine Nematodes in the Subgenus <i>Tricoma</i> (Desmoscolecida: Desmoscolecidae) from the Subtidal Zone of the East Sea, Korea, with Insights into the Ultrastructure of the Lip RegionHyo Jin Lee0Heegab Lee1Hyun Soo Rho2East Sea Environment Research Center, Korea Institute of Ocean Science and Technology (KIOST), Uljin 36315, Republic of KoreaEast Sea Environment Research Center, Korea Institute of Ocean Science and Technology (KIOST), Uljin 36315, Republic of KoreaEast Sea Environment Research Center, Korea Institute of Ocean Science and Technology (KIOST), Uljin 36315, Republic of KoreaThis study provides a taxonomic analysis of three newly discovered species of free-living marine nematodes in the subgenus <i>Tricoma</i> from the East Sea, Korea. <i>Tricoma</i> (<i>Tricoma</i>) <i>polyringulata</i> sp. nov. is characterized by its relatively small body size, with lengths of 280–370 µm in males and 320–390 µm in females, and 75–89 main rings. Diagnostic features include an uncovered first ring, triangular head shape, amphidial fovea with slight constriction, and a unique pattern of somatic setae, comprising 7–9 subdorsal and 8–12 subventral setae. <i>Tricoma</i> (<i>Tricoma</i>) <i>fortiseta</i> sp. nov. is distinguished by 65–69 main rings, 10–12 subdorsal setae, and 17–20 subventral setae, along with a hexagonal head, a well-defined labial region with six lips, and bifid-tipped cephalic setae located medially on the head. <i>Tricoma</i> (<i>Tricoma</i>) <i>uljinensis</i> sp. nov. exhibits 67–70 main rings, with a thick, sclerotized head that is 1.5 times as wide as its length, gently triangular in shape. Its diagnostic features include a gubernaculum bent downward near its midpoint and a conical terminal ring, with 25–39% of the desmos covered. Detailed morphological descriptions of each species are provided, along with a comparative table of morphological traits for species with 61–75 main rings and an illustrated key for identification.https://www.mdpi.com/2077-1312/12/12/2310marineSEM and DIC imagingbiodiversitymeiobenthosNorthwest Pacific Ocean |
| spellingShingle | Hyo Jin Lee Heegab Lee Hyun Soo Rho Taxonomic Study of Free-Living Marine Nematodes in the Subgenus <i>Tricoma</i> (Desmoscolecida: Desmoscolecidae) from the Subtidal Zone of the East Sea, Korea, with Insights into the Ultrastructure of the Lip Region Journal of Marine Science and Engineering marine SEM and DIC imaging biodiversity meiobenthos Northwest Pacific Ocean |
| title | Taxonomic Study of Free-Living Marine Nematodes in the Subgenus <i>Tricoma</i> (Desmoscolecida: Desmoscolecidae) from the Subtidal Zone of the East Sea, Korea, with Insights into the Ultrastructure of the Lip Region |
| title_full | Taxonomic Study of Free-Living Marine Nematodes in the Subgenus <i>Tricoma</i> (Desmoscolecida: Desmoscolecidae) from the Subtidal Zone of the East Sea, Korea, with Insights into the Ultrastructure of the Lip Region |
| title_fullStr | Taxonomic Study of Free-Living Marine Nematodes in the Subgenus <i>Tricoma</i> (Desmoscolecida: Desmoscolecidae) from the Subtidal Zone of the East Sea, Korea, with Insights into the Ultrastructure of the Lip Region |
| title_full_unstemmed | Taxonomic Study of Free-Living Marine Nematodes in the Subgenus <i>Tricoma</i> (Desmoscolecida: Desmoscolecidae) from the Subtidal Zone of the East Sea, Korea, with Insights into the Ultrastructure of the Lip Region |
| title_short | Taxonomic Study of Free-Living Marine Nematodes in the Subgenus <i>Tricoma</i> (Desmoscolecida: Desmoscolecidae) from the Subtidal Zone of the East Sea, Korea, with Insights into the Ultrastructure of the Lip Region |
| title_sort | taxonomic study of free living marine nematodes in the subgenus i tricoma i desmoscolecida desmoscolecidae from the subtidal zone of the east sea korea with insights into the ultrastructure of the lip region |
| topic | marine SEM and DIC imaging biodiversity meiobenthos Northwest Pacific Ocean |
| url | https://www.mdpi.com/2077-1312/12/12/2310 |
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