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The Genus Axonchium (Nematoda: Belondiridae) Vi. Atypical Species, Keys, Subgenera and Conclusions

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In this paper A. arcuatum Thorne, 1964 and A. propinquum (de Man, 1921) Thorne, 1939 are redescribed, the first on the basis of type material, the second on specimens from different localities in The Netherlands. Four new species are described: A. dolichodorum n. sp. is immediately separated from all other species in the genus by its elongate spear, "double" guiding ring, spiral oesophageal sheath and long isthmus-like constriction between the two parts of the oesophagus. A. geminum n. sp. and A. variabile n. sp. are closely related; -they are characterized by a spiral oesophageal sheath, very narrow anterior oesophagus, "double" guiding ring and large number of body pores. A. variabile is a polymorphic species which can be separated from A. geminum by the presence of a Z-organ in the uterus. A. siddiqii n. sp. is characterized by a peculiar, partly amalgamated lip region and the presence of only two ventromedian supplements in the male. Keys to females, males and subgenera of Axonchium are provided and 9 subgenera are proposed. The relationship of the genus with the most closely related genera is discussed.

Affiliations: 1: Instituut voor Dierkunde, Rijksuniversiteit Gent, Belgium


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