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Two new species of Theristus Bastian, 1865 (Nematoda: Xyalidae) from the interstitial zone of Lake Baikal, Siberia, Russia

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image of Nematology
For more content, see Nematologica.

Theristus tsalolikhini sp. n. and T. psammophilus sp. n. from the interstitial zone of Lake Baikal, Russia, are described from numerous females and males. Theristus tsalolikhini sp. n. is similar to T. ruffoi, but differs from it by the presence of elongate spermatheca, narrower labial region, shorter outer labial setae, larger amphidial fovea, more anterior position of amphidial fovea and shorter spicules and gubernaculum. Theristus psammophilus sp. n. is similar to T. athesinus, but differs from it by the presence of an elongate spermatheca, shorter outer labial setae, more anterior position of the amphidial fovea and longer spicules and gubernaculum. A pictorial key is provided for males of freshwater and groundwater species of Theristus.

Affiliations: 1: 1Institute of Inland Water Biology, Russian Academy of Sciences, Borok, Yaroslavl Province 152742, Russia; 2: 2Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Irkutsk 664033, Russia

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/content/journals/10.1163/156854111x612225
2012-01-01
2016-12-04

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