Two new rapacious nematodes from intertidal sediments, Gammanema magnum sp. nov. and Synonchium caudatubatum sp. nov. (Nematoda, Selachinematidae)
Two new species of the family Selachinematidae Cobb, 1915 from an intertidal sandy flat in the East China Sea are described. Both species are distinct rapacious nematodes, preying on other nematodes. Gammanema magnum sp. nov. is characterized by its leaf-like labial setae, large loop-shaped amphidea...
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| Format: | Article |
| Language: | English |
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Consortium of European Natural History Museums
2018-02-01
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| Series: | European Journal of Taxonomy |
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| Online Access: | http://www.europeanjournaloftaxonomy.eu/index.php/ejt/article/view/533 |
| _version_ | 1818047834579009536 |
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| author | Benze Shi Kuidong Xu |
| author_facet | Benze Shi Kuidong Xu |
| author_sort | Benze Shi |
| collection | DOAJ |
| description | Two new species of the family Selachinematidae Cobb, 1915 from an intertidal sandy flat in the East China Sea are described. Both species are distinct rapacious nematodes, preying on other nematodes. Gammanema magnum sp. nov. is characterized by its leaf-like labial setae, large loop-shaped amphideal fovea in the male and small spiral ones in the female, an anterior buccal cavity reinforced by 12 rhabdia, each rhabdion with about six denticles, and two unequally long spicules. Gammanema magnum sp. nov. is a striking species, exhibiting extreme sexual dimorphism in the amphideal fovea, but lacking a gubernaculum or precloacal supplements, all features by which it can be differentiated from congeneric species. Synonchium caudatubatum sp. nov. is characterized by a posterior buccal cavity, with three mandibles each with a large tooth flanked by three smaller teeth on both sides, a transverse oval-shaped multispiral amphideal fovea, and a bluntly rounded tail with a protuberant caudal duct. Synonchium caudatubatum sp. nov. is unique in the genus in having a protuberant caudal duct in the tail end. Furthermore, it differs from its congeners by its mandibles, which have seven teeth each. Synonchium caudatubatum sp. nov. lacks a gubernaculum and a precloacal supplement, both features present in congeners except S. depressum Gerlach, 1954. |
| first_indexed | 2024-12-10T10:12:05Z |
| format | Article |
| id | doaj.art-f0c1f1bec3d446a28ed977dd45d9f3d1 |
| institution | Directory Open Access Journal |
| issn | 2118-9773 |
| language | English |
| last_indexed | 2024-12-10T10:12:05Z |
| publishDate | 2018-02-01 |
| publisher | Consortium of European Natural History Museums |
| record_format | Article |
| series | European Journal of Taxonomy |
| spelling | doaj.art-f0c1f1bec3d446a28ed977dd45d9f3d12022-12-22T01:53:06ZengConsortium of European Natural History MuseumsEuropean Journal of Taxonomy2118-97732018-02-01040510.5852/ejt.2018.405412Two new rapacious nematodes from intertidal sediments, Gammanema magnum sp. nov. and Synonchium caudatubatum sp. nov. (Nematoda, Selachinematidae)Benze Shi0Kuidong Xu1Department of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071Department of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071Two new species of the family Selachinematidae Cobb, 1915 from an intertidal sandy flat in the East China Sea are described. Both species are distinct rapacious nematodes, preying on other nematodes. Gammanema magnum sp. nov. is characterized by its leaf-like labial setae, large loop-shaped amphideal fovea in the male and small spiral ones in the female, an anterior buccal cavity reinforced by 12 rhabdia, each rhabdion with about six denticles, and two unequally long spicules. Gammanema magnum sp. nov. is a striking species, exhibiting extreme sexual dimorphism in the amphideal fovea, but lacking a gubernaculum or precloacal supplements, all features by which it can be differentiated from congeneric species. Synonchium caudatubatum sp. nov. is characterized by a posterior buccal cavity, with three mandibles each with a large tooth flanked by three smaller teeth on both sides, a transverse oval-shaped multispiral amphideal fovea, and a bluntly rounded tail with a protuberant caudal duct. Synonchium caudatubatum sp. nov. is unique in the genus in having a protuberant caudal duct in the tail end. Furthermore, it differs from its congeners by its mandibles, which have seven teeth each. Synonchium caudatubatum sp. nov. lacks a gubernaculum and a precloacal supplement, both features present in congeners except S. depressum Gerlach, 1954.http://www.europeanjournaloftaxonomy.eu/index.php/ejt/article/view/533East China Seamarine nematodemorphologynew speciessandy sediment |
| spellingShingle | Benze Shi Kuidong Xu Two new rapacious nematodes from intertidal sediments, Gammanema magnum sp. nov. and Synonchium caudatubatum sp. nov. (Nematoda, Selachinematidae) European Journal of Taxonomy East China Sea marine nematode morphology new species sandy sediment |
| title | Two new rapacious nematodes from intertidal sediments, Gammanema magnum sp. nov. and Synonchium caudatubatum sp. nov. (Nematoda, Selachinematidae) |
| title_full | Two new rapacious nematodes from intertidal sediments, Gammanema magnum sp. nov. and Synonchium caudatubatum sp. nov. (Nematoda, Selachinematidae) |
| title_fullStr | Two new rapacious nematodes from intertidal sediments, Gammanema magnum sp. nov. and Synonchium caudatubatum sp. nov. (Nematoda, Selachinematidae) |
| title_full_unstemmed | Two new rapacious nematodes from intertidal sediments, Gammanema magnum sp. nov. and Synonchium caudatubatum sp. nov. (Nematoda, Selachinematidae) |
| title_short | Two new rapacious nematodes from intertidal sediments, Gammanema magnum sp. nov. and Synonchium caudatubatum sp. nov. (Nematoda, Selachinematidae) |
| title_sort | two new rapacious nematodes from intertidal sediments gammanema magnum sp nov and synonchium caudatubatum sp nov nematoda selachinematidae |
| topic | East China Sea marine nematode morphology new species sandy sediment |
| url | http://www.europeanjournaloftaxonomy.eu/index.php/ejt/article/view/533 |
| work_keys_str_mv | AT benzeshi twonewrapaciousnematodesfromintertidalsedimentsgammanemamagnumspnovandsynonchiumcaudatubatumspnovnematodaselachinematidae AT kuidongxu twonewrapaciousnematodesfromintertidalsedimentsgammanemamagnumspnovandsynonchiumcaudatubatumspnovnematodaselachinematidae |