TY - JOUR T1 - NEMATODES FROM A FRESH-WATER POOL ON A CORAL ISLAND IN THE SOLOMON-ISLANDS JF - HydrobiologiaHydrobiologia Y1 - 1985 A1 - Coomans, A. A1 - Vincx, M. A1 - Decraemer, W. SP - 265 EP - 281 VL - 123 SN - 0018-8158 N1 - Coomans, a vincx, m decraemer, w ER - TY - JOUR T1 - DAPTONEMA-WILLIAMSI SP-N (NEMATODA, XYALIDAE) FROM THE SOLOMON-ISLANDS JF - Zoologica ScriptaZoologica Scripta Y1 - 1983 A1 - Vincx, M. A1 - Coomans, A. SP - 237 EP - 244 VL - 12 SN - 0300-3256 N1 - Vincx, m coomans, a ER - TY - JOUR T1 - Cienfuegia gen. nov (Xyalidae) and Pseudoterschellingia gen. nov (Linhomoeidae), two new genera of free-living marine nematodes from the Caribbean Sea JF - Journal of Natural HistoryJournal of Natural History Y1 - 2009 A1 - Armenteros, M. A1 - Vincx, M. A1 - Decraemer, W. SP - 1067 EP - 1081 AB - Two new genera of nematodes are described from the Caribbean Sea. Cienfuegia gen. nov. belongs to the Xyalidae based on the position of the anterior gonad constantly left of the intestine, cuticle clearly striated, second and third circle of anterior sensilla inserted at the same level and buccal cavity surrounded by pharynx. The new genus is differentiated from other genera by the buccal cavity divided in two chambers and by the four cephalic setae being longer than the six outer labial setae. Within the Xyalidae, Cienfuegia shows most affinities with the genera Daptonema and Theristus. Pseudoterschellingia gen. nov. is placed within the Linhomoeidae on the basis of the presence of anterior rounded amphidial fovea, unarmed narrow buccal cavity, distinctive cardia and presence of apophysis of gubernaculum. Pseudoterschellingia is closely related to the genera Terschellingia and Terschellingioides, but is differentiated by the crypto-spiral amphidial fovea, and conical buccal cavity surrounded by pharyngeal tissue. VL - 43 SN - 0022-2933 N1 - Armenteros, Maickel Vincx, Magda Decraemer, Wilfrida ER - TY - JOUR T1 - A morphometric analysis of the genus Terschellingia (Nematoda: Linhomoeidae) with redefinition of the genus and key to the species JF - Journal of the Marine Biological Association of the United KingdomJournal of the Marine Biological Association of the United Kingdom Y1 - 2009 A1 - Armenteros, M. A1 - Ruiz-Abierno, A. A1 - Vincx, M. A1 - Decraemer, W. SP - 1257 EP - 1267 AB - The cosmopolitan and often ecologically dominant genus Terschellingia (Nematoda: Linhomoeidae), with 38 nominal species, is taxonomically a problematic taxon. Its species show high morphological plasticity, possess few diagnostic characters and identification keys are lacking. A revision of the genus was carried out based on morphological and morphometric data from the literature and from observations of specimens collected in Cienfuegos Bay, Caribbean Sea, Cuba. The diagnosis of the genus Terschellingia is emended. Of the current 38 nominal species, 15 are considered as valid species based on morphological characters related to size and position Of amphidial fovea, presence/position of cephalic and cervical setae, presence/size/shape of pharyngeal bulb, shape of spicular apparatus and shape of tail. Tabular and pictorial keys were provided based on these characters. Three sympatric species: T. communis, T. gourbaultae and T. longicaudata were redescribed based on recently collected Cuban specimens. Each of them showed relatively large differences in body size in comparison with the respective type specimens, suggesting possible variation due to local environmental differences. The highest intraspecific variation pertains for the most widely spread cosmopolitan species T. longicaudata, suggesting that morphological plasticity enhanced adaptation to different environmental conditions. The notable taxonomic inflation within the genus (14 species inquirendae, 9 junior synonyms), probably also present in other highly specious genera of marine nematodes, can lead to an overestimation of the alpha-diversity. VL - 89 SN - 0025-3154 N1 - Armenteros, M. Ruiz-Abierno, A. Vincx, M. Decraemer, W. ER - TY - JOUR T1 - Biodiversity patterns of free-living marine nematodes in a tropical bay: Cienfuegos, Caribbean Sea JF - Estuarine Coastal and Shelf ScienceEstuarine Coastal and Shelf Science Y1 - 2009 A1 - Armenteros, M. A1 - Ruiz-Abierno, A. A1 - Fernandez-Garces, R. A1 - Perez-Garcia, J. A. A1 - Diaz-Asencio, L. A1 - Vincx, M. A1 - Decraemer, W. SP - 179 EP - 189 AB - Spatial and temporal biodiversity patterns of free-living marine nematodes were studied in Cienfuegos Bay, a tropical semi-enclosed basin in the Caribbean Sea. Taxonomic (to species level) and functional (biological trait) approaches were applied for describing the assemblage structure and relating it to abiotic environment based on a sampling scheme in six subtidal stations and three months. Biological trait approach added relevant information to species pattern regarding relationships between diversity patterns and the abiotic environment. The most common morphotypes were deposit feeding nematodes, with colonising abilities of 2-3 (in a scale from 1 to 5), tail conical cylindrical or filiforme and body slender; and their abundance were correlated with depth, organic matter and silt/clay fraction. In spite of a high turnover of species, functional diversity of assemblages did not change notably in space and time. A result probably due to sampling of the habitat pool of species and to low heterogeneity of the studied muddy bottoms. Chemical pollution (organic enrichment and heavy metals) and hydrodynamic regime possibly drove the biodiversity patterns. Spatial distribution of assemblages support the existence of two well differentiated basins inside the bay, the northern basin more polluted than the southern one. The low hydrodynamic regime would determine a poor dispersion of nematodes resulting in high spatial variance in the assemblage structure; and also the associated hypoxic conditions and pollutants in sediments can explain the dominance of tolerant nematode species such as Daptonema oxycerca, Sabatieria pulchra, Terschellingia gourbaultae, and Terschellingia longicaudata. A comparison of spatial-temporal patterns of biodiversity between Cienfuegos Bay and other semi-enclosed bays in temperate regions suggests several similarities: nematode assemblages are strongly influenced by anthropogenic disturbance, temporal trends are weak or overridden by spatial ones, and few cosmopolitan genera/species tolerant to pollution and hypoxic conditions are dominant. (C) 2009 Elsevier Ltd. All rights reserved. VL - 85 SN - 0272-7714 N1 - Armenteros, M. Ruiz-Abierno, A. Fernandez-Garces, R. Perez-Garcia, J. A. Diaz-Asencio, L. Vincx, M. Decraemer, W. ER - TY - JOUR T1 - Guitartia tridentata n. gen., n. sp (Monhysterida: Xyalidae) and Macrodontium gaspari n. gen., n. sp (Chromadorida: Microlaimidae), free-living marine nematodes from the Caribbean Sea JF - NematologyNematology Y1 - 2010 A1 - Armenteros, M. A1 - Vincx, M. A1 - Decraemer, W. SP - 417 EP - 427 AB - Two new genera of free-living marine nematodes are described from the muddy bottom of Cienfuegos Bay, Caribbean Sea. Guitartia n. gen. (Xyalidae, Monhysterida) is characterised by three long tooth-like structures in the stegostom, second and third circle of anterior sensilla separate and posterior genital branch of the female restricted to a long post-vulvar sac. The type species is Guitartia tridentata n. gen., n. sp. Within the Xyalidae, Guitartia n. gen. is morphologically close to Amphimonhystrella, Cobbia, Elzalia, Scaptrella and Valvaelaimus, all being characterised by sclerotised structures in the stoma and transverse striation of the body cuticle. Main features for discrimination are the type of stoma structure, the shape and relative size of amphidial fovea, the presence of a post-vulvar sac and gubernacular apophyses and the absence of terminal setae on the tail. Macrodontium n. gen. (Microlaimidae, Chromadorida) is characterised by a heavily sclerotised stoma with one large dorsal tooth and two smaller subventral teeth, sexual dimorphism in size and position of the amphidial fovea and males with a single anterior testis. The type species is Macrodontium gaspari n. gen., n. sp. Within the Microlaimidae, Macrodontium n. gen. is similar to the genera Acanthomicrolaimus and Bolbolaimus due to sclerotised stoma and presence of large dorsal tooth. The new genus is similar to Aponema in sexual dimorphism in the size of the amphidial fovea, monorchic males, presence of a gubernacular apophysis and conico-cylindrical tail shape. Morphological characters of diagnostic value within the family are the ornamentation of the body cuticle, relative length of cephalic sensilla, stoma sclerotisation and number of testes. VL - 12 SN - 1388-5545 N1 - Armenteros, Maickel Vincx, Magda Decraemer, WilfridaPart 3 ER - TY - JOUR T1 - Effects of organic enrichment on nematode assemblages in a microcosm experiment JF - Marine Environmental ResearchMarine Environmental Research Y1 - 2010 A1 - Armenteros, M. A1 - Perez-Garcia, J. A. A1 - Ruiz-Abierno, A. A1 - Diaz-Asencio, L. A1 - Helguera, Y. A1 - Vincx, M. A1 - Decraemer, W. SP - 374 EP - 382 AB - Marine nematodes from subtidal tropical sediments of Cienfuegos Bay were subjected to organic enrichment in a microcosm experiment for 32 days Nematode abundance and diversity decreased and the taxonomic and trophic structure was altered The results suggested that the nematodes were not food limited in the microcosms or in their natural environment. Chemical stressors such as ammonia and hydrogen sulfide derived from reduced conditions in sediments may be Important factors affecting the assemblages Hypoxic conditions occurred in all experimental units as well as in the field suggesting a nematode assemblage adapted to naturally enriched sediments However tolerant species showed a grade of sensitivity to reduced conditions In agreement with the model by Pearson and Rosenberg (1978) we predict that further organic enrichment in sediments from Cienfuegos Bay may cause a phase shift Into a strongly depleted benthic fauna and reduced conditions in water and sediments (c) 2010 Elsevier Ltd All rights reserved VL - 70 SN - 0141-1136 N1 - Armenteros, Maickel Andres Perez-Garcia, Jose Ruiz-Abierno, Alexei Diaz-Asencio, Lisbet Helguera, Yusmila Vincx, Magda Decraemer, Wilfrida ER -