Redescription of Desportesius brevicaudatus (Spirurida, Acuariidae) based on nematodes from Ixobrychus minutus (Aves, Ciconiiformes) from Bulgaria

Summary   Desportesius brevicaudatus (Dujardin, 1845) is redescribed on the basis of light-microscopy and SEM observations on specimens collected from the oesophagus and under the lining of the gizzard of Ixobrychus minutus (Ardeidae) from Bulgaria. New metrical data expand the known ranges of variation of the measurements of the body, tail, cordons, oesophagus and spicules. New information is provided on the variation of the shape of the deirids, the structure of the vagina, the complexity of the cordons, the pattern of the cuticular striation and the shape of the postdeirids. Cordons are described as consisting of a single row of serrate cuticular plates and a longitudinal cuticular ridge along the outer rims of the cuticular plates. The cuticular ridge is interpreted as homologous to the outer row of plates in the cordons of the genera Acuaria, Cheilospirura and Echinuria.     

Two new species of Pharyngodonidae (Nematoda,Oxyuroidea) in <Emphasis Type="Italic">Gekko ulikovskii</Emphasis> from Vietnam

Pharyngodon duci sp. nov. and Spauligodon vietnamensis sp. nov. (Nematoda, Pharyngodonidae) from the large intestine of a gecko, Gekko ulikovskii (Sauria, Gekkonidae), from Vietnam are described and illustrated. Pharyngodon duci is the 35th species assigned to the genus and is separated from its congeners based upon the lack of a spicule, egg morphology, mouth morphology and cloacal lip morphology. Spauligodon vietnamensis is the 44th species assigned to the genus and is separated from its congeners by the lack of a spicule, egg morphology, and tail filament morphology.     

Gastrointestinal helminths from two species of skink from Papua New Guinea, including two new species of Skrjabinodon (Nematoda, Pharyngodonidae)

Skrjabinodon derooijae sp. nov. from the large intestine of Papuascincus stanleyanus (Scincidae) and Skrjabinodon sheai sp. nov. from the large intestine of Emoia pallidiceps (Scincidae) from Papua New Guinea are described and illustrated. Skrjabinodon derooijae sp. nov. and S. sheai sp. nov. represent the 27th and 28th species assigned to the genus and the 8th and 9th species from the Australo-Papuan Region. The new species differ from other species assigned to Skrjabinodon by egg and female tail morphology. The eggs of S. derooijae are spindleform with one truncate end and the female tail bears 13–16 tail spines in a defined pattern. The eggs of S. sheai are lagenoid and the female tail bears 12–16 tail spines in a random pattern. In addition to the new species, E. pallidiceps harboured Physalopteroides milnensis and P. stanleyanus harboured Mesocelium monas and Oswaldocruzia bakeri.     

<Emphasis Type="Italic">Spinitectus mariaisabelae</Emphasis> n. sp. (Nematoda: Cystidicolidae) from the intestine of the freshwater fish <Emphasis Type="Italic">Profundulus punctatus</Emphasis> (Cyprinodontiformes) in Mexico

Summary Spinitectus mariaisabelae n. sp. is described from the intestine of Profundulus punctatus (Günther) (Pisces, Cyprinodontiformes) from the Suchiapa River, State of Chiapas, Mexico. It is characterized largely by the bifurcate distal tip of the larger (left) spicule, spination of the cuticle separated into 4 longitudinal sectors, more or less regularly spaced rings of spines, and by the position of the excretory pore just posterior to the 7th ring of visible spines. By having the rings of spines divided into 4 sectors, the new species resembles 8 of the 15 American species; however, they can be easily distinguished by the number of spines in the first ring. S. mariaisabelae differs from all its American congeners by possessing a bifurcate distal tip of the left spicule, a unique feature among Spinitectus spp.     

First record of Longidorus intermedius Kozlowska and Seinhorst, 1979 (Nematoda: Longidoridae) from the Czech Republic

Summary Longidorus intermedius Kozlowska and Seinhorst, 1979 was recorded in the Czech Republic for the first time in the rhizosphere of Robinia pseudoacacia at Dolní Bojanovice and Carpinus betulus — Euonymus europaeus — Quercus sp. at Strážovice. The morphological and morphometrical characteristics are studied.     

A new species of Thelandros (Nematoda, Oxyuroidea, Pharyngodonidae) in Leiolepis reevesi (Sauria, Agamidae) from Vietnam

Thelandros vietnamensis sp. nov. (Oxyuroidea, Pharyngodonidae) from the intestines of an agamid lizard, Leiolepis reevesi, collected in Vietnam is described and illustrated. Thelandros vietnamensis represents the 3rd Oriental species to be described and is distinguished from all other species by length of spicule (485–536 μm) of the male; all other species have spicules less than 200 μm.     

Mammomonogamus roundworm (Nematoda: Syngamidae) recovered from the duodenum of a Thai patient: a first and unusual case originating in Thailand

A pair of Mammomonogamus laryngeus roundworms in copula was recovered from the duodenum of a 72-year-old male Thai patient from Kanchanaburi Province. Eggs were also found in the stool of the patient. This is the first case of Mammomonogamus infection originating in Thailand, as the previous two reports from Thailand attributed the infection as originating in Malaysia. The occurrence of adult worms in the duodenum is unusual and differs from previous findings in the larynx, posterior pharynx, tracheal wall and bronchi. This adds a new dimension to the manifestation of the infection.     

Etude ultrastructurale de la spermatogènese chezTrichinella spiralis Owen 1835 (Nématode trichuroïde)

Résumé L'étude ultrastructurale de la spermatogénèse chezT. spiralis a permis de retrouver chez cette espèce les caractères morphologiques observés dans la lignée mâle chez la plupart des Nématodes, c'est-à-dire absence de flagelle chez le spermatozoïde, absence de reconstitution de l'enveloppe nucléaire après divisions méiotiques, structure atypique du centriole. Elle a permis de situer le spermatozoïde par rapport aux classifications antérieurement proposées.

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An ultrastructural study of spermatogenesis inTrichinella spiralis owen 1835 (Nématode trichuroide)

The ultrastructural study of spermatogenesis inT. spiralis demonstrated the main characteristics of the male germ cells in the class Nematoda, i.e. lack of flagella, lack of reconstitution of the nuclear envelope after the meiotic divisions, and atypical structure of the centriole. The spermatozoon ofT. spiralis was compared with previous classifications of the Nematoda spermatozoa.

     

Soil nematodes inhabiting an original dry meadow and an abandoned vineyard in the National Park Seewinkel, Eastern Austria

Summary Nematode communities of cultivated vineyards showed characteristics typical for cultivated ecosystems, e.g. predominance of plant parasitic nematodes followed by bacterivores. The abandoned vineyard showed a reverse trophic structure: bacterivorous nematodes with short life cycles (cp 2) predominated and the population of plant parasites was small. The nematode trophic structure of the dry meadow was similar to the abandoned vineyard. Nevertheless, Principal Component Analysis (PCA) showed that differences in nematode communities were still detectable at the generic level, with some genera occurring solely in one or the other site (e.g. Xiphinema). Thus, soil nematodes indicated a recovery of primary production and decomposition processes in the formerly cultivated vineyard soil, because plant parasites consuming plant tissues decreased, and organic matter breakdown was slower, as in low-input grasslands. Communities of soil nematodes were also compared with intensively cultivated vineyards previously surveyed in Eastern Austria.