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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ftdoajarticles:oai:doaj.org/article:35cd31f6f47a4cb7b31338317bcc30e9 2023-08-27T04:12:28+02:00 New free-living nematode species and records (Chromadorea: Plectida and Desmodorida) from the edge and axis of Kermadec Trench, Southwest Pacific Ocean Daniel Leduc 2021-09-01T00:00:00Z https://doi.org/10.7717/peerj.12037 https://doaj.org/article/35cd31f6f47a4cb7b31338317bcc30e9 EN eng PeerJ Inc. https://peerj.com/articles/12037.pdf https://peerj.com/articles/12037/ https://doaj.org/toc/2167-8359 doi:10.7717/peerj.12037 2167-8359 https://doaj.org/article/35cd31f6f47a4cb7b31338317bcc30e9 PeerJ, Vol 9, p e12037 (2021) New Zealand Taxonomy Hadal Abyssal Nematoda Camacolaimidae Medicine R article 2021 ftdoajarticles https://doi.org/10.7717/peerj.12037 2023-08-06T00:46:55Z 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 Directory of Open Access Journals: DOAJ Articles New Zealand Pacific South Sandwich Trench ENVELOPE(-25.000,-25.000,-56.500,-56.500) Weddell Weddell Sea PeerJ 9 e12037 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
New Zealand Taxonomy Hadal Abyssal Nematoda Camacolaimidae Medicine R |
spellingShingle |
New Zealand Taxonomy Hadal Abyssal Nematoda Camacolaimidae Medicine R Daniel Leduc New free-living nematode species and records (Chromadorea: Plectida and Desmodorida) from the edge and axis of Kermadec Trench, Southwest Pacific Ocean |
topic_facet |
New Zealand Taxonomy Hadal Abyssal Nematoda Camacolaimidae Medicine R |
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. |
format |
Article in Journal/Newspaper |
author |
Daniel Leduc |
author_facet |
Daniel Leduc |
author_sort |
Daniel Leduc |
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 Inc. |
publishDate |
2021 |
url |
https://doi.org/10.7717/peerj.12037 https://doaj.org/article/35cd31f6f47a4cb7b31338317bcc30e9 |
long_lat |
ENVELOPE(-25.000,-25.000,-56.500,-56.500) |
geographic |
New Zealand Pacific South Sandwich Trench Weddell Weddell Sea |
geographic_facet |
New Zealand Pacific South Sandwich Trench Weddell Weddell Sea |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_source |
PeerJ, Vol 9, p e12037 (2021) |
op_relation |
https://peerj.com/articles/12037.pdf https://peerj.com/articles/12037/ https://doaj.org/toc/2167-8359 doi:10.7717/peerj.12037 2167-8359 https://doaj.org/article/35cd31f6f47a4cb7b31338317bcc30e9 |
op_doi |
https://doi.org/10.7717/peerj.12037 |
container_title |
PeerJ |
container_volume |
9 |
container_start_page |
e12037 |
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1775356633603375104 |