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Volume 7, Part 1 (1999)

  • O.V. Slobodyanyuk.  Revision of the species Psyllotylenchus pawlowskyi(Kurochkin, 1960) Poinar & Nelson, 1973. II. Description of Kurochkinitylenchus laevicepsi gen. n., sp. n. and Spilotylenchidae fam. n., 1-18
  • P. Reynolds, P. and J.R. Finney-Crawley.  A survey of nematode fauna associated with some marine algae in Newfoundland, 19-28
  • W. M. Wouts and D. Sturhan.  Mesocriconema hymenophorum sp. n. (Nematoda: Criconematidae) from forest soil in Germany, 29-32
  • T. V. Rubtsova, V.N. Chizhov and S.A. Subbotin.  Longidorus artemisiae sp. n. (Nematoda: Longidoridae) from roots of Artemisia sp., Rostov region, Russia, 33-38
  • S.E. Spiridonov. and M. Moens.  Two previously unreported species of steinernematids from woodlands in Belgium, 39-42
  • D. Sturhan. and L. Ruess.  An undescribed Steinernema sp. (Nematoda: Steinernematidae) from Germany and the Scandinavian Subarctic, 43-47
  • S.E. Spiridonov, W.M. Hominick and B.R. Briscoe.  Morphology of amoeboid cells in the uterus of Steinernema species (Rhabditida: Steinernematidae), 49-56
  • S.A. Subbotin, P.D. Halford and R.N. Perry.  Identification of populations of potato cyst nematodes from Russia using protein electrophoresis, rDNA-RFLPs and RAPDs, 57-63
  • A. Adiko and S.R. Gowen.  Effect of spores of Pasteuria penetrans on the motility of second-stage juveniles of Meloidogyne incognita, 65-66
  • L.M. Dzhuraeva.  Nematode types in the collection of the Institute of Zoology and Parasitology of the Academy of Sciences of Republic of Tadjikistan, 67-69


Slobodyanyuk, O.V.

Revision of the species Psyllotylenchus pawlowskyi (Kurochkin, 1960) Poinar & Nelson, 1973. II. Description of Kurochkinitylenchus laevicepsi gen. n., sp. n. and Spilotylenchidae fam. n.

Summary:
A new genus and species is proposed as the result of a revision of the species Psyllotylenchus pawlowskyi sensu (Kurochkin, 1960) Poinar & Nelson, 1973, which was found to represent three distinct species. A description of morphology and life-cycle of Kurochkinitylenchus laevicepsi gen. n., sp. n., a parasite of Nosopsyllus laeviceps fleas, is given. The nematode has alternation of two parasitic heterosexual generations during its life-cycle. Peculiarities in the life-cycle of the new genus correspond to the diagnosis of the subfamily Parasitylenchinae, but morphological features of the new genus do not coincide with contemporary diagnosis of this subfamily. New genus can be distinguished from other genera of Parasitylenchinae  by dorsal curvature of the female body, stylet morphology (strong basal thickening but without knobs), absence of cephalic cone, well separated spermatheca and several other features. An analysis of the phylogenetic relationships of Kurochkinitylenchus gen. n. with other genera of the superfamily Sphaerularioidea is presented. Morphological comparison is made with the genera Spilotylenchus (Contortylenchinae), Psyllotylenchus, Incurvinema (Heterotylenchinae, Parasitylenchidae) and Rubzovinema (Phaenopsitylenchidae). A new family Spilotylenchidae fam. n., new subfamilies, Spilotylenchinae subfam. n., Psyllotylenchinae subfam. n., Rubzovinematinae subfam. n. and Kurochkinitylenchinae subfam. n., are proposed.

Key words: Kurochkinitylenchus laevicepsi gen. n., sp. n., fleas, morphology, biology, phylogenetic relationship.
 



Reynolds, P. and Finney-Crawley, J.R.

A survey of nematode fauna associated with some marine algae in Newfoundland.

Summary:
Nematodes associated with 19 genera of marine algae on the Avalon Peninsula of Newfoundland were studied. Forty-seven species of nematodes in 31 genera were identified. Most nematodes were found on Lithothamnium glaciale, Fucus spp. I & II, Pilayella littoralis and Dictyosiphon foeniculaceus. Other algae had fewer nematodes, while none were found on five species of brown algae. Each algal growth form was dominated by different nematode species. The calcareous, filamentous and shrub-like algae had the greatest whereas the tuft-like algae and those with prominent blades had the smallest species diversity, respectively. Epigrowth feeders and predators were the dominant nematode feeding types found on all algal groups. The difference in algal structure provided varying degrees of shelter, food and refuge from predators and therefore contributed to patterns of nematode abundance and diversity.

Key words: marine algae, nematodes, diversity, abundance



Wouts, W.M. and Sturhan, D.

Mesocriconema hymenophorum sp. n. (Nematoda: Criconematidae) from forest soil in Germany

Summary:
Specimens of Mesocriconema hymenophorum sp. n. were recovered from soil collected in a mixed forest in Germany, in which spruce was predominant. The species is characterised by a distinct hyaline sheet around the body, as also occurs with M. axeste, M. basili and M. longistyletum. The new species differs from M. axeste and M. basili by having a longer stylet in females (94-105 µm vs 51-60 µm and 68-74 µm, respectively), and from M. longistyletum by the relatively small, vs very large, submedian lobes in the lip region and the straight, vs sigmoid, vagina.

Key words: Criconematidae, description, Germany, Mesocriconema hymenophorum sp. n., Nematoda, new species, pine-wood



Rubtsova, T.V., Chizhov, V.N. and Subbotin, S.A.

Longidorus artemisiae sp. n. (Nematoda: Longidoridae) from roots of Artemisia sp., Rostov region, Russia

Summary:
A description of Longidorus artemisiae sp. n., a bisexual species associated with Artemisia sp. near Starocherkassk, Rostov region, South part of European Russia is provided. The new species is characterised by its medium body length (4.7-6.6 mm),  lip region anteriorly flattened, set-off from the rest of the body by a slight depression, pocket-shaped amphidial pouch, odontostyle 84-98 µm and tail conical with bluntly rounded tip. Males are present in the population in the ratio 1:1 and have short spicules 39-49 µm. Canonical discriminant analysis distinguished this new species from populations of L. elongatus and L. attenuatus.

Key words: Longidorus artemisiae sp. n., L. elongatus, L. attenuatus, Russia, morphometrics, canonical discriminant analysis.



Spiridonov, S.E. and Moens, M.

Two previously unreported species of steinernematids from woodlands in Belgium

Summary:
Two steinernematid species, Steinernema kraussei and Steinernema sp. E1, which were not reported during previous surveys in Belgium, were recovered from woodland soils by direct extraction of infective stages from soil samples. Identification of the juveniles was based on their morphology and confirmed by RFLP analysis of the PCR amplified ITS-rDNA region. Baiting by Galleria mellonella larvae of soil samples in which these two species were present, did not result in the normal infection development and was not followed by juvenile migration. It is concluded that the presence of some populations of these two species in soil may not be revealed by Galleria baiting.

Key words: Steinernematidae, Belgium, Galleria baiting, direct examination



Sturhan, D. and Ruess, L.

An undescribed Steinernema sp. (Nematoda: Steinernematidae) from Germany and the Scandinavian Subarctic

Summary:
Infective-stage juveniles of an undescribed Steinernema species were isolated by direct extraction from soil samples in Germany. The samples originated from five non-arable sites in the northern region of the country. The morphology of the juveniles resembled that of S. intermedium and S. affine. Steinernema juveniles isolated from a subarctic heath in northern Sweden appear to belong to the same undescribed species. The potential hosts appear to prefer natural, non-arable, moist habitats.

Key words: Arctic, entomopathogenic nematode, Germany, soil, Steinernema, Sweden



Spiridonov, S.E., Hominick, W.M. and Briscoe, B.R.

Morphology of amoeboid cells in the uterus of Steinernema species (Rhabditida: Steinernematidae)

Summary:
Amoeboid cells of different morphology and behavior were observed in the lumen of the uterus of giant females of Steinernema spp. Cells from 13 described species (S. affine, S. arenarium, S. bicornutum, S. carpocapsae, S. ceratophorum, S. cubanum, S. glaseri, S. feltiae, S. intermedium, S. karii, S. kraussei, S. longicaudatum and S. riobrave) and 6 undescribed species (British isolates C1 and B3, Sri-Lankan isolates SSL1 and SSL2 and Japanese isolates MY1 and MY5) were studied. These amoeboid cells are similar in their the morphology to the spermatozoon in the nematode Caenorhabditis elegans, lending support to the suggestion that they are also spermatozoa. Morphologically similar and related species of steinernematids are characterized by having similar structure and behaviour of their associated amoeboid cells.

Key words: Steinernema spp., taxonomy, in uteri structures, amoebid cells, rhabditid spermatozoon



Subbotin, S.A., Halford, P.D. and Perry, R.N.

Identification of populations of potato cyst nematodes from Russia using protein electrophoresis, rDNA-RFLPs and RAPDs

Summary:
Twenty nine potato cyst nematode populations from Russia, five populations from England and one population each from the Ukraine, New Zealand, Germany and The Netherlands were compared using protein electrophoresis, restriction fragment length polymorphism of ribosomal DNA (rDNA-RFLP) and random amplified polymorphic DNA (RAPD) techniques. All populations from Russia were identified as Globodera rostochiensis and RAPD analysis revealed substantial genomic diversity.

Key words: molecular taxonomy, RAPD, rDNA-RFLP, Globodera rostochiensis, Russia, protein electrophoresis, identification


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