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Mononchid nematodes from oak forests in Bulgaria. 1. The subfamily Anatonchinae Jairajpuri, 1969 with descriptions of Anatonchus genovi sp. n. and Tigronchoides quercus sp. n.

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Two new and three known species of the family Anatonchidae associated with Quercus spp. in Bulgaria are described and illustrated. Anatonchus genovi n. sp. can be distinguished by the medium size of body (L = 2.5-3.2 mm) and buccal capsule (65- 70 47-59 mum), posterior dorsal tooth, tail short (170-251 mum; c = 13-17; c = 3.1-4.4), elongate conical, narrowly rounded, and cuticle very finely striated at tail tip. Tigronchoides quercus n. sp. is distinguished by females: body 2.5-2.9 mm long, buccal capsule measuring 51-58 43-48 mum, tail 198-267 mum long; males: body 2.1-2.6 mm long, buccal capsule measuring 42-48 29-38 mum, tail 161-204 mum long, ventrally curved, gradually tapering to a long almost cylindrical part with rounded tip; buccal capsule clearly transversely striated and cuticle on tail finely annulated in both sexes. Tigronchoides quercus sp. n. most closely resembles T. istvani and T. ginglymodontus. Morphological data for T. ginglymodontus, Anatonchus tridentatus and A. hortensis are presented. Comments on tooth development for Anatonchinae species with known juvenile stages are provided.

Nematodes Mononchides provenant d'une foret de chenes de Bulgarie. 1. La sous-famille des Anatonchinae Jairajpuri, 1969, avec description d'Anatonchus genovi sp. n. et de Tigronchoides quercus sp. n. - Trois especes deja connues et deux nouvelles appartenant a la famille des Anatonchidae et associees a Quercus spp. en Bulgarie sont decrites et illustrees. Anatonchus genovi n. sp. se distingue par la taille moyenne du corps (L = 2,5-3,2 mm) et de la capsule buccale (65-70 47-59 mum), la dent dorsale posterieure, la queue courte (170-251 mum; c = 13-17; c = 3,1-4,4) allongee-conique, etroitement arrondie a l'extremite dont la cuticule est finement striee. Tigronchoides quercus n. sp. se distingue par i) les femelles longues de 2,5-2,9 mm, la capsule buccale mesurant 51-59 43-48 mum, la queue longue de 198-267 mum; ii) les males longs de 2,1-2,6 mm, ayant une capsule buccale mesurant 42-48 29-38 mum, une queue longue de 161-204 mum, courbee ventralement, s'amincissant graduellement jusqu'a une longue partie subcylindrique a extremite arrondie; iii) chez les deux sexes, la capsule buccale finement striee transversalement et la cuticule caudale portant de fines stries. Tigronchoides quercus sp. n. ressemble etroitement a T. istvani et T. ginglymodontus. Des donnees sont fournies sur la morphologie de T. ginglymodontus, Anatonchus tridentatus et A. hortensis. Le developpement de la dent chez les especes d'Anatonchinae dont les stades juveniles sont connus est egalement commente.


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