• V.N. Chizhov and D. Sturhan.  Description of Deladenus minimus sp. n. (Tylenchida: Phaenopsitylenchidae), an entomogenous nematode from Germany, 1-4
• V.N. Chizhov and D. Sturhan.  Pratinema sepsis gen. n., sp. n. (Tylenchida: Allantonematidae), a parasite of coprphilous flies of the genus Sepsis (Diptera: Sepsidae), 5-8
• D.J. Hunt. and J. Sheldon. SEM studies on the area rugosa of two species of Brumptaemilius Dollfus, 1952 (Rhigonematida: Carnoyidae), 9-15
• A. Eyualem, A. Karegar, H. Nabil and P. De Ley. A redescription and ultrastructure study of Diploscapter coronatus (Cobb, 1893) Cobb, 1913 from Ethiopia and Iran, 17-22
• A. Karegar, P. De Ley and E. Geraert.  The genera Cervidellus Thorne, 1937 and Stegelletina Andrassy, 1984 (Nematoda: Cephalobidae) from Iran, with description of S. kheirii sp. n., 23-36
• P. Baujard, D. Mounport and M.E. Doucet.  Scanning electron microscope observations on Telotylenchinae Siddiqi, 1960 (Nemata: Belonolaimidae). 4. New data on Triversus festonatus (Doucet, 1985) Fortuner &Luc, 1987, 37-40
• V.V. Malakhov.  Embryological and histological peculiarities of the order Enoplida, a primitive group of nematodes, 41-46
• R.N. Perry and J. T. Jones.  The use of molecular biology techniques in Plant Nematology: past, present and future, 47-56
• Abstracts of papers presented at the Second English Language International Symposium of the Russian Society of Nematologists (Moscow, 23-30 August, 1997), 57-89
• Book Reviews, 90-92;

Chizhov, V.N. and Sturhan, D.

Description of Deladenus minimus sp. n. (Tylenchida: Phaenopsitylenchidae), an entomogenous nematode from Germany

Summary:
Descriptions are given of the infective female and the free-living male of Deladenus minimus sp. n. found in wood samples of Pinus silvestris L. trunks growing in the vicinity of Braunschweig, Germany. The new species is distinguished from the seven Deladenus species, for which the insect parasitic stages are known, by smaller sizes of both the infective female and the free-living male, a stylet with large and separated basal knobs and a conoid, pointed tail in the infective female and a leptoderan bursa in the free-living male.

Key words: Deladenus minimus sp. n., entomogenous nematode, Germany, morphology, taxonomy

Chizhov, V.N. and Sturhan, D.

Pratinema sepsis gen. n., sp. n. (Tylenchida: Allantonematidae), a parasite of coprophilous flies of the genus Sepsis (Diptera: Sepsidae)

Summary:
Pratinema sepsis gen. n., sp. n. is described from coprophilous flies of the family Sepsidae (Sepsis punctum and Sepsis sp.). This species can be distinguished from those in the related genus Contortylenchus by its ventrally curved female body, prominent cuticularization of the excretory pore and the duct in invasive females, and by the absence of bursa and a gubernaculum in free-living males. Contortylenchus species are parasites of bark beetles. The life cycle of Pratinema sepsis gen. n., sp. n. consists of a single gamogenetic population with copulation outside of host.

Key words: Allantonematidae, Diptera, Pratinema sepsis sp. n., Russia, taxonomy, Tylenchida.

Hunt, D.J. and Sheldon, J.

SEM studies on the area rugosa of two species of Brumptaemilius Dollfus, 1952 (Rhigonematida: Carnoyidae)

Summary:
SEM studies of the area rugosa of two undescribed species of Brumptaemilius Dollfus, 1952 collected from the gut of diplopods from Nigeria and South Africa are compared and contrasted and the value of the area rugosa as a taxonomic character in the genus discussed. The disposition and form of the copulatory papillae and the form of the spicules are also commented upon. A table of the known distribution of the genus in Africa is provided.

Key words: Africa, Brumptaemilius, distribution, morphology, Nigeria, SEM, South Africa.

Eyualem, A., Karegar, A., Nabil, H. and De Ley, P.

A redescription and ultrastructural study of Diploscapter coronatus (Cobb, 1893) Cobb, 1913 from Ethiopia and Iran

Summary:
Populations of Diploscapter coronatus (Cobb, 1893) Cobb, 1913 are described from Ethiopia and Iran. Scanning electron microscope pictures of this species and genus are provided for the first time. The lip region of females bears six labial papillae and lacks cephalic papillae. Both populations have very prominent annulation between the anus and mid-tail, a character not mentioned previously in descriptions of Diploscapter species.

Key words: Diploscapter coronatus, free-living nematodes, morphology, SEM, taxonomy, tropics.

Karegar, A., De Ley, P. and Geraert, E.

The genera Cervidellus Thorne, 1937 and Stegelletina Andrássy, 1984 (Nematoda: Cephalobidae) from Iran, with description of S. kheirii sp. n.

Summary:
One new and one known species of the genus Stegelletina and three species of the genus Cervidellus were found in soil samples from Iran. Stegelletina kheirii sp. n. is characterized by its convex-conoid tail with subacute terminus and by its anterior structure: labial probolae slender-conical with a single bifurcation, primary axils with single triangular guarding piece appearing as two refractive U-shaped elements, lip margins in secondary axils with four pairs of rounded tines, without refractive elements. S. kheirii sp. n is close to S. similis and S. devimucronata but differs from both mainly in the shape of the tail terminus and absence of a U-shaped element in each secondary axil. Scanning electron microscopic study of C. neftasiensis and C. vexilliger showed that the extension of the lateral field on the tail and width of the phasmid opening are variable characters. Stegelletina devimucronata and C. cancellatus were also found and described here.

Key words: Cephalobidae, Cervidellus, morphology, SEM, Stegelletina, taxonomy.

Baujard, P., Mounport, D. and Doucet, M.E.

Scanning electron microscope observations on Telotylenchinae Siddiqi, 1960 (Nemata: Belonolaimidae). 4. New data on Triversus festonatus (Doucet, 1985) Fortuner & Luc, 1987.

Summary:
Scanning electron microscope (SEM) observations on Triversus festonatus revealed the head morphology to be similar to that observed in two other species of the genus, Triversus annulatus and Triversus triglyphus. Preparation of a definitive description of the taxonomic limits of the genus Triversus requires SEM observations to be made of the two remaining species in the genus, T. hollisi and T. hyalacus.

Key words: morphology, SEM, Telotylenchinae, Triversus festonatus.

Malakhov V. V.

Embryological and histological peculiarities of the order Enoplida, a primitive group of nematodes

Summary:
Unusual features of the order Enoplida have been revealed in recent years. The type of enoplids embryogenesis differs sharply from all other nematodes. The cleavage of enoplids is characterized by the variability of the blastomeres arrangement. No strict determination of blastomeres has been revealed in the development of enoplids. Unlike in other nematodes, the bilateral symmetry appears late in the emryogenesis of enoplids. Enoplids do not have eutely which is considered to be a characteristic feature of nematodes. Enoplids are able to regenerate experimentally destroyed internal organs if the cuticle was not disrupted. These features suggest that enoplids are possibly more primitive than other nematode taxa.

Key words: cell-lineage, embryogenesis, Enoplida, eutely, regeneration.
 

Perry, R.N. and Jones, J. T.

The use of molecular biology techniques in Plant Nematology: past, present and future

Summary:
Aspects of the use of molecular biology techniques in three areas of Plant Nematology (molecular taxonomy and diagnostics, genetic engineering for resistance and gene identification and function) are presented. Selected examples are used to illustrate the expansion of research in these areas and, especially, to indicate the priorities and possible future developments for molecular biology studies of plant-parasitic nematodes. Emphasis is placed on the need for novel control strategies based on genetic engineering for resistance, the desirability of using information from Caenorhabditis elegans research and the need for an integrated approach with physiologists and biochemists to determine gene function.

Key words: C. elegans, diagnostics, gene identification, molecular biology, plant-parasitic nematodes, resistance.