Volume 3, Part 2 (1995)
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B. Tallosi,
A.Peters and R.-U. Ehlers. Steinernema bicornutum sp. n. (Rhabditida:
Steinernematidae) from Vojvodina, Yugoslavia, 71-80.
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V.G. Gagarin.
Free-living nematodes recovered from sewage disposal sites at the Rybinsk water reservoir,
Borok, Russia, 81-84.
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S.E. Spiridonov
and T.T. Bai. A
Gnathostoma juvenile (Spirurida: Gnathostomatoidea)
recovered from the coelomic cavity of an earthworm from Laos, 85-88.
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V.N. Chizhov,
S.A. Subbotin and N.N. Zakharenkova. Thripinema khrustalevi
sp. n. (Tylenchida: Allantonematidae), a parasite of Thrips (Thysanoptera)
in Moscow, 89-94.
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E. van
den Berg and P. Queneherve. Hemicycliophora paracouensis
sp. n. and a note on Criconemoides ornativulvatus Van den Berg &
Queneherve, 1993 from French Guiana (Tylenchida: Criconematinae), 95-104.
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E. Vouyoukalou
and S. Gowen. Evaluation of Pasteuria penetrans as a biocontrol
agent against populations of root-knot nematodes from Crete, 105-110.
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A. Yu.
Ryss and S. Bostrom. Geocenamus semicircularis (Tylenchida:
Belonolaimidae) from East Falkland Island in the Subantartic and its taxonomic
status, 111-116.
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A. V. Tchesunov.
Taxonomy, morphology and ultrastructure of the free-living
marine nematode Pselionema simplex De Coninck, 1942 (Chromadoria:
Ceramonematidae), 117-130.
- Book Reviews, 131-135.
Tallosi, B.,
Peters, A. and Ehlers, R.-U.
Steinernema bicornutum sp. n. (Rhabditida: Steinernematidae)
from Vojvodina, Yugoslavia
Summary:
Steinernema bicornutum sp. n., isolated from soil samples taken
in Strazilovo, Vojvodina, Yugoslavia by baiting with last instar Galleria
mellonella, is distinguished from other members of the genus Steinernema
by two protruding horn-like papillae on the head of the dauer juvenile.
The average length of the dauer stage is 770 µm, the lateral field has
8 ridges. Only second generation females and males bear a small tail mucron.
Two different spicule types occur in first generation males. The species
did not hybridize with S. carpocapsae and S feltiae, the
latter also isolated from the type locality. Its restriction fragment length
pattern of the internal transcribed spacer region of the ribosomal DNA
repeat unit differ from other Steinernema species. Dauer juveniles
with similar horn-like structures have been recorded from Spain and Germany.
Axenic and monoxenic cultures of new species were established on artificial
media. An improved time-saving method to dehydrate nematodes for permanent
preparations is described.
Key words: entomopathogenic nematode, Steinernema
bicornutum sp. n., Vojvodina, Yugoslavia, description.
Gagarin, V.G.
Free-living nematodes recovered from sewage disposal
sites at the Rybinsk water reservoir, Borok, Russia
Summary:
In sewage disposal sites at the Borok settlement 47 nematode species
were recovered including 13 secernentean species. Several trends in species
and nematofauna distribution along the pollution gradient were determined.
Key words: free-living nematodes, fresh water ecology,
antropogenous pollution.
Spiridonov,
S.E. and Bai, T.T.
A Gnathostoma juvenile (Spirurida: Gnathostomatoidea)
recovered from the coelomic cavity of an earthworm from Laos
Summary:
A gnathostomatid juvenile was found in the coelomic cavity of an earthworm,
Pheretima
lunata collected near a pig farm in Thakhek, South Laos. In the general
shape of the body and the disposition of the hooks on the head-bulb the
juvenile nematode resembled Gnathostoma doloresi Tubangui, 1923.
Key words: Gnathostoma, juvenile stage, morphology,
surface structure, SEM, earthworm host.
Chizhov, V.N.
, Subbotin, S.A. and Zakharenkova, N.N.
Thripinema khrustalevi sp. n. (Tylenchida: Allantonematidae),
a parasite of Thrips (Thysanoptera) in Moscow
Summary:
Specimens of Thripinema khrustalevi sp. n. were recovered from
Thrips (Thrips trehernei Prisner. and T. physopus L.) associated
with the flowers of Taraxacum officinale Wigg. and Hieracium
spp.
(Compositae) in Moscow lawns. Thripinema khrustalevi sp. n. can
be distinguished from the related species T. aptini (Sharga, 1932)
Siddiqi, 1986 and T. reniraoi (Reddy, Nickle & Rao, 1982) Siddiqi,
1986 by differences in the structure of the bursa, the shape of the male
tail, and, the presence of basal knobs on the stylet in infective females.
The new species can be distinguished from T. nicklewoodi Siddiqi,
1986 by the position of the orifice of the dorsal esophageal gland in infective
females and the absence of a tail cone in the parasitic female. Transmission
electron microscopy analysis showed that parasitic females did not have cuticle
and their integument consisted of microvilli. The microvilli were coated
by the thin covering layer. An identification key for the genus Thripinema
is given.
Key words: Thripinema khrustalevi sp. n., thrips, integument,
ultrastructure, Russia, identification key.
Van den Berg,
E. and Queneherve, P.
Hemicycliophora paracouensis sp. n. and a note on
Criconemoides ornativulvatus van den Berg & Queneherve, 1993 from
French Guiana (Tylenchida:Criconematinae)
Summary:
Hemicycliophora paracouensis sp. n. is described and illustrated
from specimens collected from the rhizosphere of Dicorynia guianensis
Amshoff, a forest tree growing near Paracou, west of Cayenne, French Guiana.
Females are characterized by 283-339 smooth annuli, lateral field consisting
of breaks in striae, rare anastomoses, anus situated far posterior of the
vulva (104-152 µm, RVan = 36-49 and VA%T = 97-128 %), long vulval
lips and a vulval sheath with ten to fourteen annuli, a long, gradually
tapering tail and a 103-115 µm long stylet. Females and juveniles of
Criconemoides
ornativulvatus Van den Berg & Queneherve', 1993 were present in
the same sample and the juveniles are described here, together with comments
on the females.
Key words: Criconemoides, French Guiana, Hemicycliophora
paracouensis sp. n., nematodes, taxonomy.
Vouyoukalou,
E. and Gowen, S.
Evaluation of Pasteuria penetrans as a biocontrol
agent against populations of root-knot nematodes from Crete
Summary:
The attachment of spores from different populations of Pasteuria
penetrans was assessed using a field population of root-knot nematodes
from Crete consisting of 75% Meloidogyne incognita and 25% M.
javanica. Juveniles were more heavily encumbered with spores of an
isolate of P. penetrans from South Africa and from a population
consisting of a mixture of P. penetrans isolates than by spores
from two other populations. When single egg mass lines of the component
species of the Cretan root-knot nematode population were tested, it was
found that M. javanica was the more susceptible species. A greater proportion
of the nematodes encumbered with 5-8 spores eventually became infected
than did juveniles that were encumbered by fewer spores.
Key words: Meloidogyne incognita, M. javanica, biological
contiol, Pasteuria penetrans, variability.
Ryss, A.Yu. and
Bostrom, S.
Geocenamus semicircularis (Tylenchida:Belonolaimidae)
from East Falkiand Island in the Subantarctic and its taxonomic status
Summary:
Nematode specimens collected from East Falkland Island were identified
as Geocenamus semicircularis (Luth & Decker, 1985). These specimens
were indistinguishable from G. nothus (Mien, 1955), therefore G.
semicircularis (Luth & Decker, 1985) is here proposed as junior
synonym of G. nothus (Allen, 1955). Data on morphometrics and drawings
and SEM photographs of these nematodes are given.
Key words: Geocenamus nothus, G. semicircularis, taxonomy,
East Falkland Island, SEM, synonymy.
Tchesunov,
A.V.
Taxonomy, morphology and ultrastructure of the free-living
marine nematode Pselionema simplex De Coninck, 1942 (Chromadoria:
Ceramonematidae)
Summary:
The free-living marine nematode Pselionema simplex De Coninck,
1942 (Ceramonematidae) is redescribed together with an examination of some
ultrastructural details. The species is recorded in the White Sea for the
first time. The body cuticle consists of broad rigid annules connected
with thinner flexible interconnections. The annules are ultrastructurally
simple and formed with a thick electron-lucent layer with thin electron-dense
coverings on the external and internal sides. Interconnections are multilayered.
The annule electron-lucent material corresponds to the exocuticle, and
interconnections - to the endocuticle. The cuticle of the cephalic end
is very slightly modified. The pharynx consists of the procorpus, elongated
narrowed isthmus and posterior widening. Radial myofilaments are revealed
in the procorpus and isthmus only, whereas the posterior widening is built
with pharyngeal gland cell bodies. The mid-gut is composed of four epithelial
cells as viewed in transversal sections. The recto-intestinal valve cells
possess rather long microvilli directed into the rectal lumen; a cuticular
covering is not present.
Key words: Pselionema simplex, Ceramonematidae, redescription,
ultrastructure, cuticle, pharynx, cephalic end, rectum.
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