Deep-sea nematodes (Comesomatidae) from the Southwest Pacific Ocean: five new species and three new species records

Leduc, Daniel

doi:10.5852/ejt.2012.24

Cited by 701 publications

(4 citation statements)

References 14 publications

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“…The platforms of the South American continent at that time were continuous northward along both coasts (actual Chile and Argentina) and nearer to Antarctica and New Zealand than at present (Stock & Molnar 1987). This could explain the high similarities in free-living nematode genera found on both sides of South America, especially between Chile and Argentina (Pastor de Ward 1987; Lo Russo 2013; Villares 2014) and recently in some new records found in the abyssal plains of New Zealand and in the Beagle Channel (Leduc 2012(Leduc , 2013. Recent molecular studies (Derycke et al 2013) suggest that historical processes and biogeographic barriers have strongly affected the genetic variation of marine nematode populations.…”

Section: Discussionmentioning

confidence: 78%

Two new species of Parasaveljevia Wieser, 1953 (Thoracostomopsidae, Nematoda) from Argentinean coasts (Chubut, Argentina)

Pastor¹,

Russo²,

Villares³

2015

Zootaxa

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Two new Parasavaljevia species are described, one from Puerto Madryn, and one from El Límite beach San Jorge Gulf, Chubut Province, Argentina. The two species are characterised by a combination of characters. Parasavaljevia uncinoa n. sp. is characterised by having a long rectangular cirrus, positioned at the level of the inner labial setae, rectangular mandibles with prominent lateral hooks bearing denticles in three lines of nine each and six cephalic setae of the same length, inserted at the anterior end of a small head capsule. Parasavaljevia limitense n. sp. is characterized by having a cirrus posterior positioned, between labial and cephalic setae, rectangular-arched mandibles bearing denticles in five lines of ten each in a gradient of sizes; small buccal cavity, small cephalic capsule and abundant cervical setae (4+10). An emendation of the genus diagnosis and a new key are given and discussed.

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Section: Discussionmentioning

confidence: 78%

Two new species of Parasaveljevia Wieser, 1953 (Thoracostomopsidae, Nematoda) from Argentinean coasts (Chubut, Argentina)

Pastor¹,

Russo²,

Villares³

2015

Zootaxa

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“…Comesomatids are among the most abundant nematodes in continental margin sediments (Jensen 1979). A total of 23 species have been described/recorded from New Zealand waters, 15 of which have not been recorded elsewhere (Leduc & Gwyther 2008;Leduc 2012;Leduc et al 2012b;Leduc 2013;Leduc et al 2014). Until this study, one Vasostoma and ten Sabatieria species have been described from the region.…”

Section: Introductionmentioning

confidence: 88%

Two new species and a new record of Comesomatidae (Nematoda, Araeolaimida) from Southern Hikurangi Margin, New Zealand

Rosli

Leduc

Probert

2014

Zootaxa

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We describe two new species and provide one new species record of the family Comesomatidae from a submarine canyon habitat on the Southern Hikurangi margin, New Zealand. Vasostoma hexodontium n. sp. is characterized by having an amphideal fovea with three turns, buccal cavity with six teeth and gubernaculum with long and straight caudal apophyses. Sabatieria dispunctata n. sp. is characterized by the absence of cuticle punctations, large amphideal fovea with 4.5 turns, pharynx with posterior bulb, absence of pre-cloacal supplements, strongly arcuate and cuticularized spicules, simple gubernaculum with short caudal apophyses, and vulva opening directed posteriorly. Laimella subterminata Chen & Vincx, 2000, which was originally described from the Beagle Channel and the Magellan Strait (Chile), is recorded from the Southwest Pacific for the first time.

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“…250 to 3,000 m. Samples were collected from Chatham Rise during NIWA cruise TAN0705 (March–April 2007) and TAN1103 (February 2011) under Special Permit 666 granted to NIWA by the Ministry for Primary Industries. Sediment samples were collected and processed as described in Leduc (2012) , using an Ocean Instruments MC-800A multicorer (core internal diameter = 9.5 cm). Each sample consisted of one subcore of internal diameter 26 mm taken to a depth of 5 cm.…”

Section: Methodsmentioning

confidence: 99%

Two new nematode species (Plectida: Leptolaimidae, Rhadinematidae) from Chatham Rise, New Zealand

Leduc

2020

PeerJ

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Two new species of the order Plectida are described from Chatham Rise, New Zealand. Leptolaimus dififtinus sp. nov. is characterised by the short body 319–420 microns long, truncate labial region slightly offset from body contour and bearing conspicuous outer labial papillae, cephalic setae 1.3–1.4 microns long, amphid located 4–9 microns from anterior end, lateral alae originating from middle of buccal cavity length, female without supplements, male with precloacal and postcloacal pairs of subventral setae, nine tubular supplements (alveolar supplements absent), tubular supplements weakly S-shaped with pointed tip, spicules arcuate 24 microns or 1.4 cloacal body diameters long and dorsal gubernacular apophyses. Lavareda iramscotti sp. nov. is characterised by adult body length 3,023–3,121 microns long, eight longitudinal rows of body pores each with short papilla, cephalic setae 4–5 microns long, tail 146–165 microns long, male with spicules 54 microns long, gubernaculum with triangular apophyses, 20 precloacal supplements with bifid distal tips arranged in 9 + 1 + 10 pattern, female with vulva at 55% of body length from anterior and cuticularisation perpendicular to vagina at level of vulva. The present study provides the first record of a Leptolaimus species from the New Zealand region and the first description of a female specimen of the genus Lavareda.

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Deep-sea nematodes (Comesomatidae) from the Southwest Pacific Ocean: five new species and three new species records

Abstract: Abstract. The present study describes five new free-living nematode species and provides three new species records of the family Comesomatidae (genera Cervonema Wieser, 1954, Dorylaimopsis

Cited by 701 publications

References 14 publications

Two new species of Parasaveljevia Wieser, 1953 (Thoracostomopsidae, Nematoda) from Argentinean coasts (Chubut, Argentina)

Two new species of Parasaveljevia Wieser, 1953 (Thoracostomopsidae, Nematoda) from Argentinean coasts (Chubut, Argentina)

Two new species and a new record of Comesomatidae (Nematoda, Araeolaimida) from Southern Hikurangi Margin, New Zealand

Two new nematode species (Plectida: Leptolaimidae, Rhadinematidae) from Chatham Rise, New Zealand

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