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Pseudaphelenchus yukiae n. gen., n. sp. (Tylenchina: Aphelenchoididae) associated with Cylindrotermes macrognathus (Termitidae: Termitinae) in La Selva, Costa Rica

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For more content, see Nematologica.

A species of aphelenchoidid nematode was isolated from a subterranean termite, Cylindrotermes macrognathus, during a survey of termite-associated nematodes in a conserved forest in La Selva, Costa Rica. The nematode was morphologically intermediate between the families Aphelenchidae and Aphelenchoididae, i.e., the nematode had a true bursa supported by bursal limb-like genital papillae but lacked a clear pharyngeal isthmus. The molecular phylogenetic status of the new nematode among tylenchid, cephalobid, panagrolaimid, aphelenchid and aphelenchoidid genera was analysed based on ca 1.2 kb of SSU ribosomal DNA sequence and the inferred position was basal to the family Aphelenchoididae. It was clearly not part of the clade containing the genus Aphelenchus (=Aphelenchidae). This nematode is described herein as Pseudaphelenchus yukiae n. gen., n. sp., and the family definition of Aphelenchoididae is emended to include the unique morphological characters of this new genus. The molecular phylogenetic analysis supported the paraphyly of the three Aphelenchoidinae genera Aphelenchoides, Laimaphelenchus and Schistonchus and the monophyly of Ektaphelenchinae, Seinura (Seinurinae) and Noctuidonema (Acugutturinae). However, many more representatives are needed to resolve the family-genus level phylogeny of Aphelenchoididae.

Affiliations: 1: Fort Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA; Forest Pathology Laboratory, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan; 2: Fort Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA; 3: Centre for Evolutionary Biology and Biodiversity, School of Agriculture, Food and Wine, The University of Adelaide, Waite Campus, PMB 1, Glen Osmond, South Australia 5064, Australia


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