Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand
Two new genera and five new species of Selachinematidae are described from the New Zealand upper continental slope (350-1240 m depth). <em>Synonchiella rotundicauda </em>sp. nov. is characterised by cephalic setae 0.25 cbd long, mandibles each with two pairs of hooks and two wing-like pr...
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| Format: | Article |
| Language: | English |
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Consortium of European Natural History Museums
2013-11-01
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| Series: | European Journal of Taxonomy |
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| Online Access: | http://www.europeanjournaloftaxonomy.eu/index.php/ejt/article/view/184 |
| _version_ | 1818346120246460416 |
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| author | Daniel Leduc |
| author_facet | Daniel Leduc |
| author_sort | Daniel Leduc |
| collection | DOAJ |
| description | Two new genera and five new species of Selachinematidae are described from the New Zealand upper continental slope (350-1240 m depth). <em>Synonchiella rotundicauda </em>sp. nov. is characterised by cephalic setae 0.25 cbd long, mandibles each with two pairs of hooks and two wing-like projections laterally, eight cup-shaped pre-cloacal supplements and short rounded tail. <em>Pseudocheironchus </em>gen. nov. is similar to <em>Cheironchus</em>, but differs from the latter in having a cuticle without lateral differentiation, cephalic setae only slightly longer than the outer labial sensillae, and a posterior buccal cavity with three equal mandibles. <em>Pseudocheironchus ingluviosus </em>gen. et sp. nov. is characterised by mandibles with eight blunt teeth, multispiral amphideal fovea with five turns, and a short rounded tail. Males of this new species with 17-19 cup-shaped pre-cloacal supplements. Males of the genus <em>Cobbionema </em>are described for the first time; <em>C. trigamma </em>sp. nov. is characterised by four long cephalic setae and six smaller outer labial setae in one circle, six rhabdions surrounding the anterior buccal cavity, each with two pairs of pointed projections at their posterior extremities, posterior buccal cavity widening posteriorly, with three pairs of rhabdions fused posteriorly and widening anteriorly, males with two testes pointing anteriorly and with reflexed posterior testis, and no pre-cloacal supplements. <em>Gammanema agglutinans </em>sp. nov. is characterised by a short, stout body often covered in adhering mucus and detritus, cuticle with minute spines, leaf-shaped somatic setae with ducts, sexual dimorphism in the shape of the amphideal fovea (loop-shaped in males and spiral in females), posterior buccal cavity with three pairs of broad, column-shaped rhabdions fused anteriorly, intestine cells with orange-brown granules, and small tubular pre-cloacal supplements. <em>Bendiella </em>gen. nov. is most similar to <em>Halichoanolaimus</em>, but differs from the latter, and all other genera of the family Selachinematidae, in having a cuticle with lateral differentiation consisting of longitudinal rows of larger dots, and from all other genera of the Choniolaiminae in lacking pre-cloacal supplements. <em>Bendiella thalassa </em>gen. et sp. nov. is characterised by amphideal fovea with 5.25 turns, anterior buccal cavity with twelve rhabdions, each with a pair of pointed projections at posterior extremity, posterior buccal cavity with three Y-shaped pairs of slender rhabdions fused from two thirds of distance from anterior ends, and conico-cylindrical tail. |
| first_indexed | 2024-12-13T17:13:13Z |
| format | Article |
| id | doaj.art-375f80ee8d364c77baffc3f887d31d9d |
| institution | Directory Open Access Journal |
| issn | 2118-9773 |
| language | English |
| last_indexed | 2024-12-13T17:13:13Z |
| publishDate | 2013-11-01 |
| publisher | Consortium of European Natural History Museums |
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| series | European Journal of Taxonomy |
| spelling | doaj.art-375f80ee8d364c77baffc3f887d31d9d2022-12-21T23:37:29ZengConsortium of European Natural History MuseumsEuropean Journal of Taxonomy2118-97732013-11-0106310.5852/ejt.2013.6364Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New ZealandDaniel Leduc0National Institute of Water and Atmospheric Research (NIWA), Private Bag 14-901, Kilbirnie, WellingtonTwo new genera and five new species of Selachinematidae are described from the New Zealand upper continental slope (350-1240 m depth). <em>Synonchiella rotundicauda </em>sp. nov. is characterised by cephalic setae 0.25 cbd long, mandibles each with two pairs of hooks and two wing-like projections laterally, eight cup-shaped pre-cloacal supplements and short rounded tail. <em>Pseudocheironchus </em>gen. nov. is similar to <em>Cheironchus</em>, but differs from the latter in having a cuticle without lateral differentiation, cephalic setae only slightly longer than the outer labial sensillae, and a posterior buccal cavity with three equal mandibles. <em>Pseudocheironchus ingluviosus </em>gen. et sp. nov. is characterised by mandibles with eight blunt teeth, multispiral amphideal fovea with five turns, and a short rounded tail. Males of this new species with 17-19 cup-shaped pre-cloacal supplements. Males of the genus <em>Cobbionema </em>are described for the first time; <em>C. trigamma </em>sp. nov. is characterised by four long cephalic setae and six smaller outer labial setae in one circle, six rhabdions surrounding the anterior buccal cavity, each with two pairs of pointed projections at their posterior extremities, posterior buccal cavity widening posteriorly, with three pairs of rhabdions fused posteriorly and widening anteriorly, males with two testes pointing anteriorly and with reflexed posterior testis, and no pre-cloacal supplements. <em>Gammanema agglutinans </em>sp. nov. is characterised by a short, stout body often covered in adhering mucus and detritus, cuticle with minute spines, leaf-shaped somatic setae with ducts, sexual dimorphism in the shape of the amphideal fovea (loop-shaped in males and spiral in females), posterior buccal cavity with three pairs of broad, column-shaped rhabdions fused anteriorly, intestine cells with orange-brown granules, and small tubular pre-cloacal supplements. <em>Bendiella </em>gen. nov. is most similar to <em>Halichoanolaimus</em>, but differs from the latter, and all other genera of the family Selachinematidae, in having a cuticle with lateral differentiation consisting of longitudinal rows of larger dots, and from all other genera of the Choniolaiminae in lacking pre-cloacal supplements. <em>Bendiella thalassa </em>gen. et sp. nov. is characterised by amphideal fovea with 5.25 turns, anterior buccal cavity with twelve rhabdions, each with a pair of pointed projections at posterior extremity, posterior buccal cavity with three Y-shaped pairs of slender rhabdions fused from two thirds of distance from anterior ends, and conico-cylindrical tail.http://www.europeanjournaloftaxonomy.eu/index.php/ejt/article/view/184SelachinematinaeChoniolaiminaemarine predatory nematodesbathyalSouthwest Pacific |
| spellingShingle | Daniel Leduc Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand European Journal of Taxonomy Selachinematinae Choniolaiminae marine predatory nematodes bathyal Southwest Pacific |
| title | Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand |
| title_full | Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand |
| title_fullStr | Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand |
| title_full_unstemmed | Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand |
| title_short | Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand |
| title_sort | two new genera and five new species of selachinematidae nematoda chromadorida from the continental slope of new zealand |
| topic | Selachinematinae Choniolaiminae marine predatory nematodes bathyal Southwest Pacific |
| url | http://www.europeanjournaloftaxonomy.eu/index.php/ejt/article/view/184 |
| work_keys_str_mv | AT danielleduc twonewgeneraandfivenewspeciesofselachinematidaenematodachromadoridafromthecontinentalslopeofnewzealand |