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Volume 6, Part 2 (1998)

Fadeeva, N.P. and Yushin, V.V.

Two new species and three known species of free-living marine nematodes of the genus Enoplus Dujardin, 1845 (Nematoda: Enoplidae) from the North Pacific

Illustrated descriptions are given for five species of the genus Enoplus from Pacific coastal waters. Enoplus paralittoralis and a new species, Enoplus kurilensis sp. n. were collected from the area of the Kurile Islands; E. velatus and a new species Enoplus paralpha sp. n., were collected from the area of the San Juan Islands, and E. michaelseni from the Sea of Japan.

Key words: Enoplus kurilensis sp. n., E. paralpha sp. n., E. velatus, E. paralittoralis, E. michaelseni, marine nematodes, North Pacific, taxonomy.

Kulikov, V.V., Dashchenko, O. I., Koloss, T. V. and Yushin, V.V.

A description of the free-living marine nematode Euchromadora robusta sp. n. (Nematoda: Chromadorida) with observations on the ultrastructure of the body cuticle

Euchromadora robusta sp. n. found in meiobenthos samples from the Sea of Japan and the Sea of Okhotsk is described. The new species differs from other species in the genus by its long body (3.0-3.9 mm), thick cuticle (about 9 um), and shape of spicules and gubernaculum. The ultrastructure of the body cuticle and transformation of the cuticle in the head end is reported.

Key words: Euchromadora robusta sp. n., nematode, cuticle, ultrastructure, Sea of Japan, Sea of Okhotsk.

Doucet, M. E., Ferraz, L.C.C. B., Magunacelaya, J.C. and Brown, D.J.F.

The occurrence and distribution of longidorid nematodes in South America

The occurrence and distribution in Latin America of nematode species belonging to the Longidoridae are presented. Fifty-four nominal valid species, one species inquirenda, and one new, undescribed species are reported from 24 countries/territories in the region. In many of these countries, and in another five Latin America countries, longidorid nematodes have been recorded but identified only to generic level. The genera recorded are Longidoroides, Longidorus, Paraxiphidorus, Xiphidorus and Xiphinema. Longidoroides, Longidorus and several Xiphinema species probably represent introductions to the region whereas Paraxiphidorus, Xiphidorus and other Xiphinema species are considered indigenous. Nepoviruses have been associated with an unidentified Longidorus in Peru, Xiphinema americanum sensu lato nematodes have been associated with tobacco and tomato ringspot nepoviruses in Peru and Chile, respectively, and X. index has been associated with grapevine fanleaf nepovirus in vineyards in Argentina and Chile. Longidorid nematodes have been reported associated with a wide range of cultivated and uncultivated plants in Latin America. It is concluded that research on longidorid nematodes and their associated nepoviruses should be coordinated in the region to develop and establish control strategies to reduce the detrimental impact on agriculture and horticulture of these nematodes and associated nepoviruses.

Key words: distribution, Longidoroides, Longidorus, nepoviruses, Paralongidorus, Paraxiphidorus, Xiphidorus, Xiphinema.

Doucet, M.M. A. de and Cagnolo, S.R.

Agamermis decaudata Cobb, Steiner & Christie, 1923 (Nematoda: Mermithidae) parasitizing Castnia dedalus isopods in Cordoba, Argentina

A population of Agamermis decaudata from Cordoba, Argentina, is described on the basis of its morphology and morphometrics and is compared with other populations of the species. Variability occurring in morphological and morphometric characters is analyzed and provides new data on the nematodes' biology. The morphological characters correspond to those known for the species, but for some characters the mean values are smaller and the morphometric limits greater than those previously published. Variability of these characters was largest in males than females. The nematodes were found parasitizing Castnia dedalus, which is the first record of isopods being attacked by members of the genus Agamermis. The nematode had not previously been recorded from Cordoba and this occurrence extends the known distribution of the genus.

Key words: Agamermis decaudata, distribution, isopods, morphology, morphometry, parasitism, variability.

Santiago, R.P., Abolafia, J. and Guirado, D.J.

Nematodes of the order Dorylaimida from Andalucia Oriental, Spain. The genus Prodorylaimus Andrassy, 1959. I. Monosexual species

Four species of the genus Prodorylaimus Andrassy, 1959 were recovered from soil samples collected mainly in natural areas from south-eastern Spain. Descriptions, measurements and illustrations of P. acris (Thorne, 1939) Loof, 1985, P. cantabricus sp. n., P. uliginosus Loof, 1985 and Prodorylaimus sp. are presented. Prodorylaimus cantabricus sp. n. is distinguished by the body being 1.7-2.1 mm long, lip region truncate and continuous with the body and 14-16 Ám wide, odontostyle 29-33 Ám long or 1.9-2.1 times the lip region width, pharyngeal bulb 180-226 Ám long, V% = 45.8-52.0, prerectum 88-104 Ám long and tail filiform (325-412 Ám, c=4.8-6.1, c'=109-15.0). These represent the first records of the occurrence of P. acris and P. uliginosus in Spain.

Key words: Prodorylaimus cantabricus sp. n., Iberian Peninsula, taxonomy.

Abolafia, J., Santiago, R.P. and Guirado, D.J.

Nematodes of the order Dorylaimida from Andalucia Oriental, Spain. The genus Prodorylaimus Andrassy, 1959. II. Bisexual species

This paper deals with four previously known species of the genus Prodorylaimus Andrassy, 1959 collected mostly from natural areas in south-eastern Spain: P. brigdammensis (de Man, 1876) Goodey, 1963; P. filiarum Andrassy, 1964; P. longicaudatoides Altherr, 1968 and P. mas Loof, 1985. The species are described and illustrated, and tables of measurements are also given. Prodorylaimus longicaudatoides and P. mas are reported for the first time from the Iberian peninsula.

Key words: bisexual species, Prodorylaimus spp., taxonomy.

Kolossova, N.V.

Bursaphelenchus eroshenkii sp. n. (Nematoda: Aphelenchoididae) from the Russian Far East, with a key to some species of Bursaphelenchus Fuchs, 1937

Bursaphelenchus eroshenkii sp. n. is described from specimens extracted from dead wood of Pinus sibirica, collected in the Russian Far East. It differs from all other species of the genus Bursaphelenchus by the presence of a spicula cucullus and absence of a vulval flap. Bursaphelenchus eroshenkii sp. n. is similar to B. borealis Korentchenko, 1980, but differs by spicula and tail terminus shape.

Key words: Bursaphelenchus eroshenkii sp. n., key, morphology, Pinus sibirica, Russia.

Lazarova, S., Peneva, V. and Neilson, R.

Nematodes of the genus Tripyla Bastian, 1865 (Nematoda: Enoplida) from woodlands in Bulgaria.

During an investigation of nematode diversity in Bulgarian woodlands, four species of Tripyla (T. affinis, T. filicaudata, T. infia and T. setifera) were detected in soils associated with different trees: pine, spruce, beech and oak. Morphological data are provided for the four Tripyla species. Tripyla infia was a new geographic record for Bulgaria. Tripyla setifera was recovered from bark of a pine tree. Tripyla setifera and T. filicaudata were the most common and abundant tripylid species.

Key words: Bulgaria, morphology, new record, Tripyla, woodland.

Aleshin, V.V., Kedrova, O. S., Milyutina, I. A., Vladychenskaya, N. S. and Petrov, N. B.

Relationships among nematodes based on the analysis of 18S rRNA gene sequences: molecular evidence for monophyly of chromadorian and secernentian nematodes

The relationships among nematodes were studied by 18S rRNA gene sequencing. On the basis of phylogenetic trees and cladistic analysis of the secondary structure of helix 49, some orders of traditional Adenophorea should be ascribed to the Secernentea. The Chromadorida and Desmodorida should be grouped with nematodes of a complex consisting of the Monhysterida, Plectida and Secernentea. This taxon may be named Chromadoria, as was proposed earlier (Drozdovsky, 1981), since chromadorids are most closely related to the common ancestor of these groups. Hence, the class Adenophorea in a traditional sense is paraphyletic and should be revised.

Key words: Nematoda, Adenophorea, Secernentea, Chromadoria, 18S rRNA, molecular phylogeny.

Romanenko, N.D.

Redescription of Longidorus rubi Tomilin & Romanenko in Romanenko, 1993 (Nematoda: Longidoridae) associated with raspberry in the Poltava region, Ukraine

Longidorus rubi Tomilin & Romanenko in Romanenko, 1993, is redescribed and illustrated from paratypes. Longidorus rubi is most similar to L. pini Andres & Arias, 1987, L. longicaudatus Siddiqi, 1962, L. distinctus Lamberti et al., 1983 and L. nirulai Siddiqi, 1965.

Key words: Longidoridae, Longidorus rubi, nematode, raspberry, Ukraine.

Brzeski, M.W. and Dolonski, C.M.

Compendium of the genus Tylenchorhynchus Cobb, 1913 sensu lato (Nematoda: Belonolaimidae)

A compendium of diagnostic characters of 177 species of the genus Tylenchorhynchus sensu lato is presented. These data assist with the selection of species descriptions which should be consulted to enable identification to be made of Tylenchorhynchus nematodes. The genera Bitylenchus, Dolichorhynchus, Neodolichorhynchus, Quinisulcius, Trilinellus and Macrorhynchus are considered synonyms of Tylenchorhynchus.

Key words: compendium, species, synonyms, taxonomy, Tylenchorhynchus.