Revision of <i>Desmodora</i> With Descriptions of New Desmodorids (Nematoda) from Hydrothermal Vents of the Pacific

Verschelde, Dominick; Gourbault, N.; Vincx, Magda

doi:10.1017/s0025315400039977

Cited by 34 publications

(43 citation statements)

References 10 publications

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“…This species was transferred to Bolbolaimus (erratum?) by Muthumbi et al (1995), but later transferred to Bolbonema by Verschelde et al (1998). Because this species clearly has a head capsule and cephalic setae located posterior to the amphids, we confirm that it belongs to Bolbonema.…”

Section: Remarkssupporting

confidence: 74%

“…6C), and (3) annulations are present dorsally and ventrally at least to mid-level of amphids, with one continuous annulation anterior to the amphid (see Figs 6B, 7A-C). The genus Bolbonema, however, is characterized by a globular head capsule (i.e., conspicuously thicker cuticle and absence of annulations; Verschelde & Vincx 1996;Verschelde et al 1998). Muthumbi et al (1995) provided an emended diagnosis for Chromaspirina and, more recently, Silva et al (2009) provided an emended diagnosis for Spirinia.…”

Section: Remarksmentioning

confidence: 99%

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New Spirinia and Stygodesmodora species (Nematoda, Spiriniinae) from the Southwest Pacific, and a revision of the related genera Spirinia, Chromaspirina and Perspiria

Leduc

Verschelde

2015

EJT

694

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Abstract. Two new species of the family Desmodoridae are described from the upper continental slope of New Zealand, Southwest Pacific, and the genera Spirinia, Chromaspirina and Perspiria are revised. Spirinia verecunda sp. nov. is characterised by a short, stout body, cuticle covered in minute, hair-like structures, unispiral amphideal aperture and cryptospiral amphideal fovea, buccal cavity with small dorsal tooth and minute subventral teeth, eight oblong glands surrounding anterior portion of pharynx, large sperm cells, spicules with weak capitulum, and the absence of precloacal supplements. Stygodesmodora confusa sp. nov. is characterised by a relatively short body, spiral amphids with 1.2-1.4 turns, cephalic setae situated at or slightly posterior to mid-level of amphid, and males with four precloacal supplements consisting of short setae on wide bases. Like other species of the genus, S. confusa sp. nov. is characterised by an annulated head region, but in some specimens the cuticle annulations are restricted to the dorsal and ventral sides of the head. S. confusa sp. nov. shows similarities with species of other desmodorid genera (i.e., Echinodesmodora, Bolbonema), but can be differentiated from them by the presence of an annulated head region and amphideal plates. The genera Spirinia, Chromaspirina and Perspiria have very similar morphologies and differ mainly in the size and structure of the buccal cavity (Spirinia vs Chromaspirina) or the shape of the tail and placement of the amphids relative to the cuticle annulations (Spirinia vs Perspiria); their diagnoses are clarified and some nomenclatural changes are proposed to eliminate overlap in the definitions of these genera.

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Section: Remarkssupporting

confidence: 74%

Section: Remarksmentioning

confidence: 99%

New Spirinia and Stygodesmodora species (Nematoda, Spiriniinae) from the Southwest Pacific, and a revision of the related genera Spirinia, Chromaspirina and Perspiria

Leduc

Verschelde

2015

EJT

694

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“…Some species of Desmodora were described from hydrothermal vents of the Pacific (Verschelde et al, 1998). Bernhard et al (2000 reported the presence of the ectosymbiont-harbouring Desmodora masira in the oxygen minimum zone of the Santa Barbara Basin (California margin, 475-600 m).…”

Section: Giant Pockmark Complex Regabmentioning

confidence: 99%

Deep-sea habitat heterogeneity influence on meiofaunal communities in the Gulf of Guinea

Gaever

Galéron

Sibuet

et al. 2009

Deep Sea Research Part II: Topical Studies in Oceanography

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To estimate the degree of spatial heterogeneity of benthic deep-sea communities, we carried out a multiple-scale (from m's to 200 km) investigation in the Congo-Angola margins (Equatorial West African margin, 3150-4800 m) in which we examined the metazoan meiofauna at a variety of habitats along the Congo Channel system and in the associated cold seep. We investigate the structure, density, vertical distribution patterns in the sediment and biomass of meiofaunal communities in the Gulf of Guinea and how they are controlled by hydrologic and biogeochemical processes. The meiofaunal communities in the Gulf of Guinea were shaped by heterogeneous conditions on the margin, and reflect the multiple-scale spatial variability that corresponds with different identified habitats. The two control sites, located at >100 km away from the canyon, were inhabited by very dense and the most diverse meiobenthic communities. Similar meiobenthic communities inhabited the transition zone between the canyon and the cold seep. Sites located along the Congo Channel were obviously affected by the local high-velocity bottom currents and unstable sedimentary conditions in this active submarine system. Extremely low meiobenthic densities and very low proportions in the most surficial sediment layers provided evidence for recently highly disturbed sediments at these sites. The ROV Victor 6000 provided images of the cold seep, showing a patchy distribution of several types of patchy distributed megafaunal communities dominated by three key symbiotic taxa (Mytilidae, Vesicomyidae and Siboglinidae). These cold seep sediments were colonised by a unique meiobenthic community, characterised by a high small-scale (m's) patchiness, low species richness and the prominent dominance of two large-sized nematode species: Sabatieria mortenseni, which is a cosmopolitan nematode known from littoral habitats, and an undescribed Desmodora species. The high individual body weight of Sabatieria mortenseni and its dominance at the cold seep site resulted in a significantly higher nematode biomass at the seep compared to the surrounding sites. In addition, the vertical A c c e p t e d m a n u s c r i p t 2 nematode profiles, with maximum proportions in subsurficial layers, points to a chemosynthesis-based meiobenthic community in this cold seep, in contrast to the phytodetritus-based communities at the control sites and at the transition zone.

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“…Additional individuals were recorded from the marine reaches of the Swan River Estuary, also in similar sediments. Verschelde et al (1998) ascribe two other species to the genus Bolbonema, namely B. brevicolle Cobb, 1920, andB. longisetosum Jensen, 1985.…”

Section: Habitatmentioning

confidence: 99%

New species of free-living aquatic nematodes from south-western Australia (Nematoda: Axonolaimidae and Desmodoridae)

Hourston¹,

Warwick²

2010

Rec West Aust Mus

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-Descriptions of 10 new species of free-living aquatic nematodes are presented. Four of the new species belong to the Axonolaimidae, i.e. Ascolaimus australis, Parascolaimus brevisetus, Odontophora serrata and Parodontophora aurata. The remaining six species belong to the Desmodoridae, i.e. Bolbonema spiralis, Onyx cephalispiculus, O. potteri, Eubostrichus otti, Catanema australis and Leptonemella peronensis. All 10 species were found in sediments taken from near-shore waters of either the Swan River Estuary or marine waters of the Perth region (Western Australia). Ascolaimus australis differs from its only congener A. elongatus in that its spicules are non-barbed and have rounded proximal cephalations. Parascolaimus brevisetus is different from its four other congeners by its short cephalic setae, which are less than one quarter the length of any other Parascolaimus, and the spicule cephalations are rounded rather than simple or spade-shaped. Parodontophora aurata is distinguished from six morphologically similar species by the unique arrangement ((4D-2V)2) and greater length (6 µm) of the opisthocephalic setation. Odontophora serrata is distinct from other Odontophora species in that each odontiuim bears seven dentate projections, which is more projections than similar species, O. bermudensis (5), O. villoti (3) and O. paravilloti (3). Bolbonema spiralis has spiral amphids with two turns, in contrast to those of B. longisetosum, which are only a single loop. Onyx cephalispiculus is most similar to O. sagittarius but has more robust spicules with large, bilobed cephalations. Onyx potteri is the only Onyx species to exhibit spicules with a distinct constriction and one of only two species with ten tubular precloacal supplements. The other, O. dimorphus, has sexually dimorphic amphids whereas O. potteri does not. Eubostrichus otti is most similar to E. topiarus but is only half the size. Cephalic setation is also divergent, with E. otti having two cephalic crowns, eight setae in the anterior, four in the posterior, whereas this arrangement is reversed for E. topiarus. Catanema australis is most similar to C. exilis but is distinguished from that species by the lack of prominent, tubular, postcloacal supplements and having only four pairs of normal setae on the tail. Leptonemella peronensis is most similar to L. granulosa but differs in its non-granular cephalic capsule, shorter tail and different circumcloacal setation (two precloacal, four postcloacal and one terminal double pair v. L. granulosa's seven postcloacal pairs).

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Revision of Desmodora With Descriptions of New Desmodorids (Nematoda) from Hydrothermal Vents of the Pacific

Cited by 34 publications

References 10 publications

New Spirinia and Stygodesmodora species (Nematoda, Spiriniinae) from the Southwest Pacific, and a revision of the related genera Spirinia, Chromaspirina and Perspiria

New Spirinia and Stygodesmodora species (Nematoda, Spiriniinae) from the Southwest Pacific, and a revision of the related genera Spirinia, Chromaspirina and Perspiria

Deep-sea habitat heterogeneity influence on meiofaunal communities in the Gulf of Guinea

New species of free-living aquatic nematodes from south-western Australia (Nematoda: Axonolaimidae and Desmodoridae)

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