Papers by Wilfrida Decraemer
Journal of Nematology, 2019
During a survey in the Botanical garden of Ghent University, a new species Rotylenchus rhomboides... more During a survey in the Botanical garden of Ghent University, a new species Rotylenchus rhomboides n. sp. and a population of Rotylenchus buxophilus were found. Rotylenchus rhomboides n. sp. is characterized by the presence of a rhomboid-like widening of the mid-ridge of lateral field at the level of vulva, a feature previously unknown within the genus. The population of the new species, composed only by females, has a rounded labial region with 4 to 5 annuli, robust stylet (31–37 μm long), short dorsal esophageal gland (9–19 μm) overlap of the intestine, vulva located slightly posterior to mid-body, and hemispherical or rounded tail shape with large phasmids located 3 to 5 annuli anterior to the level of anus. The hierarchical cluster analysis based on morphological features indicated that the new species closely resembles R. corsicus, R. gracilidens, and R. rugatocuticulatus. The DNA analyses of the D2-D3 of 28S rDNA, ITS rDNA, and COI mtDNA sequences of Rotylenchus rhomboides n. s...
Journal of Helminthology, 2019
A survey for slug-associated nematodes in five locations of East and West Flanders in Belgium rev... more A survey for slug-associated nematodes in five locations of East and West Flanders in Belgium revealed the presence of one new and six known slug-parasitic nematodes,Agfa flexilis(Dujardin, 1845),Alloionema appendiculatum(Schneider, 1859),Angiostoma dentiferum(Mengert, 1953),Angiostoma limacis(Dujardin, 1845),Angiostoma norvegicum(Rosset al., 2017) andPhasmarhabditis hermaphrodita(Schneider, 1859).Angiostoma norvegicumandP.hermaphroditaare recorded for the first time in Belgium. The six known species are documented by light microscopy (LM) microphotographs and informative DNA sequences.Angiostoma gandavensisn. sp. (Angiostomatidae), discovered from arionid slugs, is described based on light microscopy, scanning electron microscopy (SEM) and molecular data. Based on analyses of D2D3 expansion segment of 28S and 18S rDNA sequences, this new species is found to be related toA.limacis,A.norvegicum,A.margaretae(Rosset al., 2011) andA.milacis(Ivanova and Wilson, 2009). The new species can...
Ocean Science Journal, Sep 1, 2016
A new species of free-living marine draconematid nematode, Dracograllus trukensis sp. nov., is de... more A new species of free-living marine draconematid nematode, Dracograllus trukensis sp. nov., is described based on the specimens collected from the sediments of a intertidal seagrass bed from Chuuk Islands, Micronesia. Dracograllus trukensis sp. nov. differs from other species of the genus by the combination of the following characteristics: the presence of numerous minute spiny ornamented body cuticular annules in both sexes, eight cephalic adhesion tubes inserted on the head capsule in both sexes, the presence of stiff posteriorly directed setae anterior to posterior adhesion tubes in both sexes, the shape (large, elongated, open loopshaped in male and large, elongated, closed loop-shaped in female) and position (longer ventral arm extending to the first body annule in male) of amphideal fovea, shorter spicule length (34−42 µm), the presence of sexual dimorphism in shape and length of the non-annulated tail terminus, and number of posterior sublateral adhesion tubes (10 in male and 13−15 in female) and posterior subventral adhesion tubes (8−10 in male and 9−11 in female). A comparative table on the biogeographical and ecological characteristics of the species of Dracograllus is presented. This is the first taxonomic report on the genus Dracograllus from Chuuk Islands, Micronesia, central western Pacific Ocean.
Russian Journal of Nematology, 2008
A new species of Xiphinema from north western Iran is described herein. Xiphinema robbinsi sp. n.... more A new species of Xiphinema from north western Iran is described herein. Xiphinema robbinsi sp. n. is characterized by its body length (3-3.8 mm), anterior end broadly rounded with a marked depression and high labial region, medium-sized odontostyle length (107.5-127 mu m), females with two equally developed genital branches with well developed ovijector and spines ill tubular part of uterus, a short convex-conoid tail, abundant males in population and four juvenile stages. The new species most closely resembles X aceri Chizhov, Tiev & Turkina, 1986, X. aequum Roca & Lamberti, 1988, Xipinema riparia Chizhov, Subbotin, Romanenko & Kruchina, 1991 and X macedonicum Barsi & Lamberti, 1999 and belongs to species group 6 of the polytomous key of Loof & Luc (1990).
Phylogenetic analysis and ancestral state reconstruction revealed that Pratylenchidae evolved at ... more Phylogenetic analysis and ancestral state reconstruction revealed that Pratylenchidae evolved at least four times independently, but always from migratory ectoparasitic ancestors. The inclusion of the burrowing endoparasitic nematodes in a single family Pratylenchidae is classically defined by a context of similar morphological character sets that are likely the result of convergent evolution related to similar feeding modes. Morphological uniformity is especially striking within the genus Pratylenchus, and this in combination with overlapping morphometrical characters hampers species delineation within this genus. Pratylenchus araucensis n. sp., a new root-lesion nematode associated with Musa plants in Colombia, is described using a combination of morphological and molecular data. Our results fill the requirements of evolutionary species concept (a species forms a separate lineage or separate clade) and phylogenetic species concept (a lineage can be characterized by autapomorphies). We discuss the theoretical foundation and the practical application of this approach.
Three new species of the genus Metepsilonema STEINER are described from the Guadeloupe littoral m... more Three new species of the genus Metepsilonema STEINER are described from the Guadeloupe littoral marine interstitial habitats-M. magdae sp.n. is significantly characterised by the pearl-like ornamentation of the distal edge of the posterior annules and by the shape and sexual dimorphism of the amphids-M. clasingae sp.n. displays a noteworthy cuticular ornamentation with long posterior subdorsal spines, far more pronounced in juveniles-In M. glutinosum sp.n. the ambulatory setae are glued together, even in juveniles-M. bermudae L ORENZEN described from Bermuda and reported from Galapagos, has been collected rather frequently in Lesser Antillae.
Fundamental and applied nematology, 1996
An extensive survey of longidorids in Argentina resulted in the collection of numerous population... more An extensive survey of longidorids in Argentina resulted in the collection of numerous populations pertaining to various species of XiphidoTUS. Their study provides additional information on each of them and thus enlarges our knowledge of intraspecific variation. Nematodes studied are: X. amazonensis, X. bakarceanus, X. saladillensis, X. yepesara, X. achalae, and X. minor. X. lucumanensis is proposed as a junior synonym of X. balcarceanus and X. parlhenus as a subspecies, X. yepesara parlhenus n. grad., besides X. yepesara yepesara. A key ta the species and subspecies is given. Résumé-Étude sur le genre Xiphidorus Monteiro, 1976 (Nenzatoda : Longidoridae)-Une enquête étendue concernant les Longidorides d'Argentine a permis de recueillir de nombreuses populations appartenant à diverses espèces de Xiphidonts. Leur étude a fourni des données complémentaires sur chacune d'entre elles et permis de préciser leur variabilité instraspécifique. Ont ainsi été étudiés: X. amazonensis, X. bakarceanus, X. saladillensis, X. yepesara, X. achalae et X. minor. X. lucumanensis est proposé comme synonyme mineur de X. balcarceanus et X. parlhenus comme une sous-espèce, X. yepesara parlhenus n. grad., à côté de X. yepesara yepesara. Une clé des espèces et sous-espèces est proposée.
Australasian Plant Pathology, 1991
During a survey of plant parasitic nematodes associated with native vegetation in Australia, two ... more During a survey of plant parasitic nematodes associated with native vegetation in Australia, two new species of Paratrichodorus were found. Paratrichodorus orrae n.sp. was collected from Eucalyptus woodland and P. queens landensis n.sp. from tropical rainforest, both closely resem bling P. grandis. Paratrichodorus lobatus and the closely related P. teres are studied and the six trichodorid spe cies recorded in Australia are listed.
Nematology, 2012
Xiphinema zagrosense sp. n. is described based on morphological and molecular characters. The new... more Xiphinema zagrosense sp. n. is described based on morphological and molecular characters. The new species belongs to morphospecies group 6 characterised by having two equally developed female genital branches with spines in uterus and a short, rounded tail. The new species is characterised by having spines in the tubular part of the uterus, body length 3.8-5.0 mm, odontostyle length 151-169 μm, odontophore 94-105 μm, conical, dorsally convex tail, four juvenile stages and absence of males. The new species appears closely related to the members of X. pyrenaicum group characterised by a rounded tail with or without an inconspicuous digitate end and a uterus devoid of Z-differentiation but showing spiniform structures. It is compared with X. aceri, X. adenohystherum, X. iranicum, X. mazandaranense, X. nuragicum, X. pyrenaicum, X. robbinsi, X. sphaerocephalum and X. vuittenezi. In addition to morphological and morphometric data, molecular analyses of the near-full-length small subunit rDNA gene (SSU) and large subunit rDNA gene (LSU) D2/D3 placed the new species in close relation with some species belonging to Xiphinema group 6 but differs from other species in the X. pyrenaicum complex.
Nematologia Mediterranea, Dec 15, 2012
The present paper is the third of a series dealing with longidorids found in Senegal (Faye and Mo... more The present paper is the third of a series dealing with longidorids found in Senegal (Faye and Mounport, 2007, 2010). A survey was conducted in the central as well as southern regions of Senegal, in natural and cultivated areas from 1997 to 2005. Besides species of the genera Longidorus Micoletzky, 1922 and Paralongidorus Siddiqi, Hooper et Khan, 1963, soil samples yielded three species of Xiphinema Cobb, 1913, which are described herein. MATERIALS AND METHODS Soil samples were taken at 5-30 cm depth, using a hand fork. Nematodes were extracted from 1 kg soil samples by Seinhorst's (1962) elutriation method and subsequently fixed at 60 °C in 4% formaldehyde solution. After several days in fixative, specimens were processed and mounted on Cobb's double cover slip slides in anhydrous glycerine using the paraffin wax ring method. After close examination, specimens from soils from Dakar came close to two different species belonging to the "Xiphinema americanum group", namely Xiphinema luci Lamberti and Bleve-Zacheo, 1979, and X. opisthohysterum Siddiqi, 1961; and those from soil from Ziguinchor appeared to represent a new species. Measurements were taken using an ocular micrometer and illustrations were made using a drawing tube attached to a Leitz Ortholux microscope. The terminology used for the description of amphidial fovea follows Decraemer and Coomans (2007). DESCRIPTIONS XIPHINEMA MOUNPORTI sp. n. (Tables I and II; Figs 1 and 2) Female. Body slender, gradually tapering towards both extremities, but more so anteriorly, with maximum diameter at vulval level. Habitus in comma-shape, more ventrally bent in posterior region when relaxed by gentle heating. Cuticle 1.5 µm thick at mid-body, thicker (3-3.5 µm) at dorsal side of tail. Lateral chords 10-13 µm wide at mid-body, i.e., 24-32% of corresponding body diameter (cbd). Lip region rounded, 5 µm high, separated from the rest of the body by a depression. Amphidial fovea funnel-shaped, amphidial aperture slit-like, 50-64% of cbd long. Stylet robust, 36-45% of pharynx length long; odontostyle 1.5 µm thick along its length, 9-10 times lip region width long or 61-64% of total stylet, with forked base; guiding apparatus with double rings 6-13 µm apart when stylet fully retracted; odontophore 9-11 µm thick at flanges. Pharynx dorylaimoid; slender part 6 µm wide, narrowing to 3.5 µm in front of basal bulb; vestigium 2-8 µm long, located at 30-49 µm from
Nematology, 2012
Xiphinema mazandaranense n. sp. is described and illustrated. The new species belongs to morphosp... more Xiphinema mazandaranense n. sp. is described and illustrated. The new species belongs to morphospecies group 6, which is characterised by having two equally developed female genital branches that have spines in the uteri and a short, rounded tail. The new species is characterised by having spines in the tubular portion of the uterus, body 3.7-5.2 mm long, odontostyle 163-173 μm long, odontophore 96-100 μm long, body 62-80 μm diam., rounded tail, four juvenile stages, males rare with three ventromedian supplements next to the adcloacal pair and spicules 85 μm long. The polytomous identification codes of the new species are: A4-B3-C7b-D6-E456-F45-G4-H2-I23-J7b-K2-L1. The new species appears closely related to the members of X. pyrenaicum group which are characterised by a rounded tail with or without an inconspicuous projecting bulge and a uterus devoid of Z-differentiation but showing spiniform structures. The new species differs from members of the X. pyrenaicum group, which includes the recently described X. iranicum, by a more rounded tail without any projection. Beside morphological and morphometric data, molecular analyses of the near-full-length small subunit rDNA gene (SSU) placed the new species in close relationship with some species belonging to Xiphinema morphospecies group 6 and further separated this species from the X. pyrenaicum complex.
Bulletin du Muséum national d'histoire naturelle. Section A, Zoologie, biologie et écologie animales, 1979
Desmoscolecids from sublittoral fine-sand of Pierre Noire (West Channel) (Nematoda, Desmoscoleicd... more Desmoscolecids from sublittoral fine-sand of Pierre Noire (West Channel) (Nematoda, Desmoscoleicda) by Wilfrida Decraemer * Résumé.-Desmoscolecides des sables fins infralittoraux de la Pierre Noire (Manche Occiden¬ tale) (Nematoda , DesmoscolecidaJ .-L'article concerne les Desmoscolecides des sables fins infralittoraux de la Pierre Noire, baie de Morlaix (France). Deux nouvelles espèces sont décrites : Ilaptotricoma boucheri sp. nov. est caractérisée par 218-227 anneaux cuticulaires, chaque anneau orné d'un cercle d'écailles, et par la présence, dorsalement et ventralement, de deux longues soies glan¬ dulaires du côté droit du corps et de trois soies glandulaires du côté gauche du corps ; Desmoscolex roscoff ensis sp. nov. se distingue de toutes les espèces connues par la forme des soies céphaliques, fines, longues, flanquées d'une membrane et par la disposition des soies somatiques, caractérisée par l'absence de soies subventrales sur l'anneau 15. Une redescription ou des informations complé¬ mentaires sont données sur
Bulletin du Muséum national d'histoire naturelle. Section A, Zoologie, biologie et écologie animales, 1986
Zoologica Scripta, Sep 1, 1978
ABSTRACT The following species are described: Q. papillata sp.n., characterized by its head-shape... more ABSTRACT The following species are described: Q. papillata sp.n., characterized by its head-shape with broad truncated anterior end and in males by the possession of 2 single short, stout ventral genital papillae situated anterior to the middle of the body; Q. lizardiensis sp.n., closely related to Q. papillata but distinguished from the latter by its head-shape with a pronounced distally widened anterior border and the absence of genital papillae in the male; Q. freudenhammeri sp.n., characterized by its head-shape with an anteriorly tapering naked front part with thickened, sclerotized cuticle and a rounded posterior part covered with thin cuticle and by the stoma with cheilorhabdia; Q. noffsingerae sp.n., characterized by its head-shape with widened truncated anterior border surrounding 6 sometimes protruding lips, each with a tube-like papilla and by the position of the ocelli situated along the posterior half of the long cylindrical oesophagus.
CABI Publishing eBooks, 2006
This paper provides morphological descriptions of the nematodes of the Orders Chromadorida, Desmo... more This paper provides morphological descriptions of the nematodes of the Orders Chromadorida, Desmodorida and Desmoscolecida as well as their habitats, geographical distribution, taxonomic details, illustrations and keys to the genera.
Zoologica Scripta, Mar 20, 2017
The family Tylenchidae is phylogenetically important to understanding early-branching Tylenchomor... more The family Tylenchidae is phylogenetically important to understanding early-branching Tylenchomorpha and to assess soil ecosystems. In this study, we focus on Malenchus and Filenchus as representatives of the Tylenchidae. Samples collected worldwide result in 58 new sequences, and light microscopy and transmission electron microscopy provide details on morphological features. For the first time, comprehensive morphological data are evaluated in the context of a molecular framework, thus highlighting the phylogenetic and evolutionary complexity of this structurally minimalistic group. Results show that the genus Filenchus is polyphyletic in both the 18S and 28S rDNA phylogeny, while Malenchus is polyphyletic and monophyletic in the 28S rDNA and the 18S rDNA, respectively. Ultrastructural study demonstrates specific aspects of lateral cuticular incisures, cuticular layering and the amphideal fovea are surprisingly congruent with the obtained molecular phylogenies, while classical characteristics such as cuticle annulations are evolutionary highly plastic and mosaic in distribution. The study also reveals the shortage of D2/D3 domain in 28S rDNA as a phylogenetic marker for early-branching Tylenchomorpha.
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Papers by Wilfrida Decraemer