New free-living nematode species and records (Chromadorea: Plectida and Desmodorida) from the edge and axis of Kermadec Trench, Southwest Pacific Ocean
One new nematode species is described and two new species records are provided from the edge (6,080 m depth) and axis (7,132 m) of Kermadec Trench, Southwest Pacific. Leptolaimus hadalis sp. nov. is characterised by medium body 587–741 μm long, labial region not offset from body contour, inconspicuo...
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crpeerj:10.7717/peerj.12037 2024-06-02T08:15:46+00:00 New free-living nematode species and records (Chromadorea: Plectida and Desmodorida) from the edge and axis of Kermadec Trench, Southwest Pacific Ocean Leduc, Daniel NIWA’s Coasts and Oceans Centre Research Programme European Research Council Advanced Grant HADES-ERC Trench Project National Science Foundation 2021 http://dx.doi.org/10.7717/peerj.12037 https://peerj.com/articles/12037.pdf https://peerj.com/articles/12037.xml https://peerj.com/articles/12037.html en eng PeerJ https://creativecommons.org/licenses/by/4.0/ PeerJ volume 9, page e12037 ISSN 2167-8359 journal-article 2021 crpeerj https://doi.org/10.7717/peerj.12037 2024-05-07T14:14:26Z One new nematode species is described and two new species records are provided from the edge (6,080 m depth) and axis (7,132 m) of Kermadec Trench, Southwest Pacific. Leptolaimus hadalis sp. nov. is characterised by medium body 587–741 μm long, labial region not offset from body contour, inconspicuous labial sensilla, amphid located 12–19 μm from anterior end, female without supplements, male with four tubular precloacal supplements (alveolar supplements absent), tubular supplements almost straight with dentate tip, arcuate spicules and weakly cuticularized dorsal gubernacular apophyses strongly bent distally. In a previously published ecological survey of Kermadec Trench, L. hadalis sp. nov. was the most abundant species in a core obtained at 8,079 m water depth and third most abundant species in a core obtained at 7,132 m, while only one individual was found at 6,096 m depth, and none at 9,175 m depth (Leduc & Rowden, 2018). Alaimella aff. cincta and Desmodora aff. pilosa are recorded for the first time from the Southwest Pacific region. Prior to the present study, Alaimella had only been recorded from coastal locations and from the Weddell sea to a depth of 2,000 m. The record of Desmodora aff. pilosa at 6,080 m depth is the deepest record of a Desmodora species to date, although unidentified Desmodora specimens have been found as deep as 6,300 m in the South Sandwich Trench. The morphology of the Kermadec Trench Alaimella aff. cincta and Desmodora aff. pilosa specimens bear a strong resemblance to their respective type populations from the Northern Hemisphere, but further morphological and molecular data are required to ascertain whether they in fact represent distinct species. Article in Journal/Newspaper Weddell Sea PeerJ Publishing Pacific South Sandwich Trench ENVELOPE(-25.000,-25.000,-56.500,-56.500) Weddell Weddell Sea PeerJ 9 e12037 |
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Open Polar |
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PeerJ Publishing |
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language |
English |
description |
One new nematode species is described and two new species records are provided from the edge (6,080 m depth) and axis (7,132 m) of Kermadec Trench, Southwest Pacific. Leptolaimus hadalis sp. nov. is characterised by medium body 587–741 μm long, labial region not offset from body contour, inconspicuous labial sensilla, amphid located 12–19 μm from anterior end, female without supplements, male with four tubular precloacal supplements (alveolar supplements absent), tubular supplements almost straight with dentate tip, arcuate spicules and weakly cuticularized dorsal gubernacular apophyses strongly bent distally. In a previously published ecological survey of Kermadec Trench, L. hadalis sp. nov. was the most abundant species in a core obtained at 8,079 m water depth and third most abundant species in a core obtained at 7,132 m, while only one individual was found at 6,096 m depth, and none at 9,175 m depth (Leduc & Rowden, 2018). Alaimella aff. cincta and Desmodora aff. pilosa are recorded for the first time from the Southwest Pacific region. Prior to the present study, Alaimella had only been recorded from coastal locations and from the Weddell sea to a depth of 2,000 m. The record of Desmodora aff. pilosa at 6,080 m depth is the deepest record of a Desmodora species to date, although unidentified Desmodora specimens have been found as deep as 6,300 m in the South Sandwich Trench. The morphology of the Kermadec Trench Alaimella aff. cincta and Desmodora aff. pilosa specimens bear a strong resemblance to their respective type populations from the Northern Hemisphere, but further morphological and molecular data are required to ascertain whether they in fact represent distinct species. |
author2 |
NIWA’s Coasts and Oceans Centre Research Programme European Research Council Advanced Grant HADES-ERC Trench Project National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Leduc, Daniel |
spellingShingle |
Leduc, Daniel New free-living nematode species and records (Chromadorea: Plectida and Desmodorida) from the edge and axis of Kermadec Trench, Southwest Pacific Ocean |
author_facet |
Leduc, Daniel |
author_sort |
Leduc, Daniel |
title |
New free-living nematode species and records (Chromadorea: Plectida and Desmodorida) from the edge and axis of Kermadec Trench, Southwest Pacific Ocean |
title_short |
New free-living nematode species and records (Chromadorea: Plectida and Desmodorida) from the edge and axis of Kermadec Trench, Southwest Pacific Ocean |
title_full |
New free-living nematode species and records (Chromadorea: Plectida and Desmodorida) from the edge and axis of Kermadec Trench, Southwest Pacific Ocean |
title_fullStr |
New free-living nematode species and records (Chromadorea: Plectida and Desmodorida) from the edge and axis of Kermadec Trench, Southwest Pacific Ocean |
title_full_unstemmed |
New free-living nematode species and records (Chromadorea: Plectida and Desmodorida) from the edge and axis of Kermadec Trench, Southwest Pacific Ocean |
title_sort |
new free-living nematode species and records (chromadorea: plectida and desmodorida) from the edge and axis of kermadec trench, southwest pacific ocean |
publisher |
PeerJ |
publishDate |
2021 |
url |
http://dx.doi.org/10.7717/peerj.12037 https://peerj.com/articles/12037.pdf https://peerj.com/articles/12037.xml https://peerj.com/articles/12037.html |
long_lat |
ENVELOPE(-25.000,-25.000,-56.500,-56.500) |
geographic |
Pacific South Sandwich Trench Weddell Weddell Sea |
geographic_facet |
Pacific South Sandwich Trench Weddell Weddell Sea |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_source |
PeerJ volume 9, page e12037 ISSN 2167-8359 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.7717/peerj.12037 |
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PeerJ |
container_volume |
9 |
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e12037 |
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1800740051859013632 |