• A.Y. Ryss. Phylogeny of the order Tylenchida (Nematoda), 74-95.
• P. van Luc and S.E. Spiridonov. Severianoia annamensis sp.n. from Surinam cockroaches Pycnoscelus surinamensis from Quang Tri province, Vietnam, 97-101.
• E.S. Ivanova. Parasitic nematodes of earthworms: 1. Four new species of Dicelis Dujardin, 1845 from Eastern Europe and a diagnosis of the genus, 103-116.
• N.Sasanelli and T. D'Addabbo. Potential application of the leaves of Ruta graveolens for controlling Meloidogyne javanica on sunflower, 117-120.
• A.V. Tchesunov. Notes on the family Tubolaimoididae Lorenzen, 1981 (Nematoda: Chromadoria) with a description of Chitwoodia tenuipharyngealis sp.n., 121-128.
• A.Y. Ryss. Aphlenchoides tsalolikhini sp.n. (Nematoda: Aphelenchida) from Ethiopia, 129-132.
• In Memoriam, 133-134.
• Dissertation Abstracts, 135-138.
• Book Review, 139

Ryss, A.Y.

Phylogeny of the order Tylenchida (Nematoda)

Summary:
The most valuable structures for the macrotaxonomy of the class Nematoda - amphid, phasmid, deirid, lateral field and head sensory organs are situated on the lateral radii of the nematode body or near them. It is proposed to consider all these organs as a complex structural unit: «the lateral complex». Caudal alae of males (bursa) also belong to the lateral complex. There are 1) the non-phasmidial caudal alae (phasmids are absent from the tail); 2) the pre-phasmidial caudal alae (caudal alae are situated anterior to the phasmids and 3) the phasmidial caudal alae (phasmids are situated on the caudal alae as phasmidial ribs, alae envelop the tail). Phylogeny of the order Tylenchida is analysed by comparison of the lateral complexes of the taxa. Atetyleitchus is the most primitive taxon. Some amendments are made to the classification by Siddiqi (1986), which is considered closest to the natural order. The order Tylenchida consists of 4 suborders, three of them (Tylenchina, Criconematina, Hexatylina) possess complexes of synapomorphic characters and therefore are considered to be monophyletic. The suborder Hoplolaimina is regarded as being paraphyletic, thus containing the remainder of the taxonomic divisions of the order. Roplolaimina contains 2 superfamilies: 1) Dolichodoroidea: Psilenchidae, Meiodoridae n. rank: Mejodorus, Bracitydorus, Neodolichodorus, Hirschmanniella and 2) Hoplolaimoidea: Merliniidae n.rank, including Pratylendioides, Belonolaimidae, (corresponding to Belonolaiminae sensu Siddiqi, 1986), Tylenchorhynchidae and other families of higher plant parasites. Hoplolaimoidea differs from Dolichodoroidea by the structure of the phasmidial caudal alae of males which envelops the tail, and by a lateral field in females and juveniles reaching the hyaline portion of the tail (in Dolichodoroidea the lateral field does not reach the hyaline portion of the tail). Psilenchidae represent a paraphyletic group which is not defined by synapomorphic characters. The most primitive taxa of Tylenchida, including Atetyleitchus, belong to this group. Keys for the identification of the superfamilies and the families of the suborder Hoplolaimina are given.

Key-words: phylogeny, morphology, evolution, new taxa, Merlinnidae n. rank, Meiodoridae n. rank.

Luc, P. Van and Spiridonov, S.E.

Severianoia annamensis sp.n. from Surinam cockroaches Pycnoscelus surinamensis from Quang Tri province, Viet Nam

Summary:
Severionoia annamensis sp. n. is described from the hind gut of cockroaches Pycnoscelus surinamensis collected in Quang Tri province, Viet Nam. Morphological dimorphism in males is reported. The composition and diagnosis of the genus Severianoia are discussed. A single female of Suifunema sp. and numerous immature Leidynema females were also found in the same host.

Key words: Severianoia annamensis sp. n., Thelastomatidae, Oxyurida, cockroach host, South-East Asia.

Ivanova, E.S.

Parasitic nematodes of earthworms: I. Four new species of Dicelis Dujardin, 1845 from Eastern Europe and a diagnosis of the genus

Summary:
Four new species of Dicelis are described from earthworms collected in the European part of Russia and the Crimea. D. kimmeriensis sp. n. is similar to D. hyrcanus sp. n., but differs by having larger spicules with a smooth surface, larger number of genital papillae and morphometric differences. D. lovatiana sp. n. and D. lurnbricicola sp. n. resemble the type species D. filaria. However, both species differ from the latter by having larger eggs and more numerous genital papillae. These two new species can be distinguished by the length and morphology of their spicula and the size of their cephalic papilla. An amended diagnosis for the genus Dicelis Dujardin, 1845 is presented. Specimens of the genus Dicelis identified by Belostozkaya et al. (1987) as D. filaria are defined here as D. pereliae sp. n.

Key words: Drilonematidae, morphology, Dicelis, D. kimmeriensis sp. n., D. hyrcanus sp. n., D. lovatiana sp. n., D. lumbricicola sp. n., earthworm hosts.

Sasanelli, N. and D'Addabbo, T.

Potential application of the leaves of Ruta graveolens for controlling Meloidogyne javanica on sunflower

Summary:
The efficacy of Ruta graveolens leaves, used as green manure, was compared with fenamiphos for the control of Meloidogyne javanica on sunflower in the glasshouse. Chopped green leaves of R. graveolens were less effective than fenamiphos. The effect of R. graveolens was more evident on nematode population density than on plant growth parameters, and always only at high initial population densities of nematodes.

Key words: Meloidogyne javanica, nematicidal properties, Ruta graveolens, sunflower.

Tchesunov, A.V.

Notes on the family Tubolaimoididae Lorenzen, 1981 (Nematoda: Chromadoria) with a description of Chitwoodia tenuipharyngealis sp. n.

Summary:
Chitwoodia tenuipharyngealis sp. n. and Tubolaimoides tenuicaudatus (Allgen, 1934) are described from specimens recovered from the White Sea. C. tenuipharyngealis sp. n. differs from C. menora Gerlach, 1956 by its longer body (1760 µm vs 1148 µm), finely striated cuticle and proximally widened spicules, and from C. warwicki Jayasaree, 1976 by its amphidial width (12 µm and 39% c.b.d. vs 5-6.5 µm and 19-26% c.b.d), thin and weak pharynx which is not enlarged anteriorly and its longer, thinner body (1760 µm and a=52 vs 1410-1460 µm and a=38-39). During ontogenesis in C. tenuipharyngealis the round amphid of the J4 transforms into the loop-shaped amphid of the adult. The phenomenon of amphid metamorphosis in larval development of marine nematodes is discussed and new amended diagnosis of the taxa Tubolaimoides Gerlach, 1963, Chitwoodia Gerlach, 1956 and Tubolaimoididae Lorenzen, 1981 are presented.

Key words: marine nematodes, morphology, Chitwoodia tenuipharyngealis sp. n., Tubolaimoides , Chitwoodia , Tubolaimoididae, the White Sea.

Ryss, A.Y.

Aphelenchoides tsalolikhini sp. n. (Nematoda: Aphelenchida) from Ethiopia.

Summary:
Aphelenchoides tsalolikhini sp. n. is described from specimens collected from the Langano lake region in Ethiopia. It differs from all other species of Aphelenchoides by the presence of 2 pairs of dark-stained sclerotized cells on the dorsal side of the vagina. A. tsalolikhini sp. n. is close to A. franklini Sing, 1969, A. parasaprophilus Sanwal, 1965, A. subparietinus Sanwal, 1961 and differs from them by shape of the tail terminus, longer male tail and shorter dorsal wing on the spicule.

Key words: morphology, Aphelenchoides tsalolikhini sp. n., Ethiopia.