Volume 2, Part 1 (1994)
Four new species and new subspecies of the genus Homungella Timm,
1966 (Rhabditida: Drilonematoidea) from Laos and Vietnam, 1-13.
A synopsis of the Hethidae (Nematoda: Rhigonematida) with descriptions
of five new species of Heth Cobb, 1898 from diplopods from Papua
New Guinea, 15-31.
and L.P. Nezlin. Neurons containing catecholamine in juveniles of
eight species of free-living marine nematodes, 33-40.
G.L. Zelenskii and S.A. Subbotin. An assessment of resistance in
cultivars of Oryza sativa L. to Aphlenchoides besseyi Christie,
B. Boag and R.W. Small. Species diversity and biogeography of Mononchoidea
Spiridonov and P. van Luc. Cephalobium montanum sp.n. (Rhabditida:
Cephalobiidae) from the hind gut of the cricket Teleogryllus derelictus
,Gorochov collected in Vietnam, 55-59.
D. Sturhan and A.Y. Ryss. Occurrence of nematode-parasitic bacteria
of the genus Pasteuria
in the former USSR, 61-64.
Parasitic nematodes of earthworms: II. Two new species of Dicelis
Dujardin, 1845 from Siberia and a key to the species of the genus, 65-74.
- In Memoriam, 75-76.
- Book Reviews, 77-78.
Four new species and new subspecies of the genus Homungella
Timm, 1966 (Rhabditida: Drilonematoidea) from Laos and Vietnam
Four new Homungella species are described from the coelomic
cavity of Indochina earthworms of the genus Pheretima. Homungella
kishonense sp. n. is characterized by a thin-walled hook, amphidial
opening connected to head armature and smooth egg-shell; H. laotense
sp. n. is distinguished by a slight development of the head armature, which
does not engulf the amphidial opening, and slightly mammillated egg-shells; H.
mekongianum sp. n. has a large cephalic hook, strongly armoured head
end and the egg-shell is densely covered with rod-like projections; H.
seponense sp. n. is characterised by the amphidial opening incorporated
in the thick cuticular belt of head armature, curved thick-walled hook
and rod-like projections on the egg-shell. Specimens of H. ornithorhynchum Ivanova & Spiridonov, 1987 (nom. emend.),
previously described from Vietnam were found in Laos. These are described as representatives of a new subspecies for
this species. A dichotomous key for identification of Homungella
Key words: new species, Homungella, Homungellidae,
Drilonematoidea, earthworm hosts, South-East Asia, identification key,
A synopsis of the Hethidae (Nematoda: Rhigonematida)
with descriptions of five new species of Heth Cobb, 1898 from diplopods
from Papua New Guinea
Five new species of the genus Heth Cobb, 1898: H. costata
sp. n., H. ortonwilliamsi sp. n., H. xaniophora sp. n., H.
sutherlandi sp. n. and H. zeuglocantha sp. n. are described
from two species of diplopod from Papua New Guinea. The new species can
be distinguished mainly on the basis of their cuticular ornamentation and
disposition of lateral spines of the female cervical region and presence
or absence of cuticular somatic ridges or lateral alae. Scanning electron
micrographs of the cephalic and cervical regions of three of the species
are presented. A synopsis of the family Hethidae is provided together with
a list of species and a diagnosis of the genus Heth. Also, a bibliography
Key words: Rhigonematida, Hethidae, Heth, generic
diagnosis, new species, diplopod hosts, scanning electron microscopy, Papua New Guinea.
Voronov, D.A. and
Neurons containing catecholamine in juveniles of eight
species of free-living marine nematodes
The occurrence, number and distribution of neurons containing catecholamine
(CC) was determined using histofluorescent techniques with first stage
juveniles of eight species belonging to the subclass Adenophorea. This
feature was demonstrated to be species-specific. In all species, two pairs
of cephalic CC neurons innervating four cephalic sensillae were observed.
The number and localization of the remaining CC neurons (somatic neurons)
vary between different species and correspond to the somatic sensillae.
The pattern of CC neurons in the juveniles of marine Adenophorea is similar
to that in juveniles and adults of Secernentea but not to that of adult
Key words: catecholamines, neurons, first stage juveniles,
brevis, Enoplus communis, Pontonema vulgare, Odoncholaimus lepidus,
Chromodoropsis vivipara, Paracanthonhus macrodon, Theristus setosus, Sphaerolaimus
Zelenskii, G.L. and Subbotin, S.A.
An assessment of resistance in cultivars of Oryza
sativa L. to Aphelenchoides besseyi Christie, 1942
The rice leaf nematode Aphelenchoides besseyi is widely distributed
and causes substantial reductions in crop yields in the rice-growing regions
of Russia. Methods for controlling this nematode include the use of resistant
cultivars. An assessment of 1003 rice cultivars from different ecologo-geographic
origin for their resistance to A. besseyi was made in the glasshouse.
Three cultivars were immune, 10 highly resistant, 164 moderately resistant
and 826 susceptible and highly susceptible to A. besseyi. High and
moderately resistant cultivars reduced nematode population levels but some
development was observed with nematodes remaining at the end of vegetative
period. The potential for using tolerant cultivars to control A. besseyi
Key words: Aphelenchoides besseyi, resistance, rice,
Oryza sativa, cultivars, nematodes.
, Boag, B. and Small, R.W.
Species diversity and biogeography of Mononchoidea
The mononchid faunae of 12 distinct geographical areas were compiled
from the literature and species distribution analysed with regard to diversity,
extent of area and distance from the equator. Results suggest while some
species have a cosmopolitan distribution the majority are restricted to
one area. At the generic level 11 out of 28 were recorded from only one
area. A study of patterns of geographical distribution indicated that Anatonchinae
were more prevalent in the Northern Hemisphere, Cobbonchus in the
Southern Hemisphere aud Mononchinae did not occur in either New Caledonia
or New Zealand. No association was found between number of species and
the size of the area. It is suggested that the diversity of species probably
reflects habitat diversity. A trend for an increased diversity towards
the equator was found.
Key words: biogeography, distribution, diversity, latitudinal
gradients, Mononchoidea, nematodes.
S.E. and Van Luc, P.
Cephalobium montanum sp. n (Rhabditida: Cephalobiidae)
from the hind gut of the cricket Teleogryllus derellctus Gorochov
collected in Vietnam
Cephalobium montanum sp. n. is described from the hind gut of
the large tropical cricket Teleogryllus derelictus Gorochov collected
in Quang Tri province of Vietnam. This new species resembles the type species
microbivorum in the size of egg-shells, but differs in the shape and
size of spicules and gubernaculum. The shape of spicules in C. montanum
sp. n. and C. microvatum Rao & Rao, 1965 are similar but these
are longer in the former species. Also, the structure of the stoma and
oesophagus are very similar in these species but the egg-shells are much
smaller in the latter.
Key words: Cephalobium montanum sp. n., Rhabditida,
intestinal habitat, cricket host.
S.A., Sturhan, D. and Ryss, A. Yu.
Occurrence of nematode-parasitic bacteria of the genus
Pasteuria in the former USSR
Examination of nematodes mounted on microscope slides and additional
specimens collected from several countries of the former USSR revealed
the presence of nematode-parasitic bacteria of the genus Pasteuria.
The bacteria were associated with soil and aquatic nematodes originating
from many different biotopes. Pasteuria spores were found attached
to the cuticle and/or internally in a total of 31 nematode species (24
identified species) belonging 22 genera, 14 families and 6 orders.
Key words: nematodes, parasites, bacteria, Pasteuria,
hosts, distribution, USSR.
Parasitic nematodes of earthworms: II. Two new species
of Dicelis Dujardin, 1845 from Siberia and a key to the species
of the genus.
Two new species of Dicelis are described from earthworms collected
in Western and North-Eastern Siberia. D. sibirica sp. n. is similar
to D. nira, but can be distinguished by the shape of the spicular
apparatus, egg shell ornamentation and morphometric differences. D.
rubidi sp. n. is similar to D. nira and
D. sibirica sp.
n. in the shape of the male tail and to D. rossica and D. hyrcanus
the shape of the female tail. D. rubidi sp. n. differs from
nira by having more numerous genital papillae; from D. sibirica
sp. n. by the shape of the amphids and different structure of the egg shell;
from D. rossica by egg shell ornamentation and smaller suckers and
amphids and from D. hyrcanus by the different position and size
of suckers and more numerous genital papillae. The composition of the genus
is reviewed and only 11 species are considered valid. A dichotomous key
for the identification of
Dicelis species is provided.
Key words: Drilonematidae, morphology, Dicelis,
sibirica sp. n., D. rubidi sp. n., earthworm host, identification
key, taxonomic revision, species list.