Characterisation of an Iberian population of Rhyssocolpus iuventutis Andrássy, 1971 (Dorylaimida: Nordiidae), with a revised taxonomy of the genus

in Nematology
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The identity and evolutionary relationships of the genus Rhyssocolpus are analysed and discussed using an integrative approach including morphological data and partial SSU-rDNA sequences. An Iberian population of R. iuventutis is characterised in detail, providing the first SEM observations of the genus. New sequences of the genera Enchodelus and Rhyssocolpus are provided for comparative purposes. Both morphological and molecular evidence support a separate status for the aforementioned two genera and Heterodorus, of which the latter and Rhyssocolpus shared a recent common ancestor, whereas Enchodelus did not, as had been traditionally assumed, occupy a close position. The Nordiidae is confirmed to be an artificial taxon. The taxonomy of Rhyssocolpus is revised and an emended diagnosis, updated list of species, key to their identification and compendium of their morphometrics are provided. Some nomenclatorial changes are also proposed: R. alleni and R. paradoxus are retained under Eudorylaimus, their original genus, whereas R. brasiliensis is transferred to Eudorylaimus as E. brasiliensis (Meyl, 1956) comb. n.

Characterisation of an Iberian population of Rhyssocolpus iuventutis Andrássy, 1971 (Dorylaimida: Nordiidae), with a revised taxonomy of the genus

in Nematology



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    Rhyssocolpus iuventutis Andrássy, 1971 (female, LM). A: Entire; B-D: Anterior region in lateral median view; E: Anterior genital branch; F: Lip region in lateral surface view; G-I: Vagina and vulva, showing cuticular irregularities in vulval area; J: Posterior body region; K-M: Caudal region. (Scale bars: A = 200 μm; B, G-I, K-M = 10 μm; C, D, F = 5 μm; E = 50 μm; J = 20 μm.)

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    Rhyssocolpus iuventutis Andrássy, 1971 (male, LM). A: Entire; B-D: Pharyngeal expansion, showing location of DN (B) and S2N (C, D); E: Neck region; F: Posterior body region; G: Caudal region; H, I: Spicules. (Scale bars: A = 200 μm; B-D = 20 μm; E, F = 50 μm; G-I = 10 μm.)

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    Rhyssocolpus iuventutis Andrássy, 1971 (male, SEM). A: Anterior region in sublateral view; B: Lip region in face view; C: Caudal region in subventral view; D: Posterior body region; E: Caudal region in ventral view. (Scale bars: A, B = 5 μm; C, E = 20 μm; D = 50 μm.)

  • View in gallery

    Rhyssocolpus iuventutis Andrássy, 1971 (female, SEM). A: Anterior region in lateral view; B: Same in sublateral view; C: Lip region in face view; D-F: Vulval region; G-I: Caudal region. (Scale bars: A-C = 5 μm; D-F = 20 μm; G-I = 10 μm.)

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    Maximum-likelihood tree generated with the K2 + G + I model from the SSU rDNA sequence alignment. The scale bar represents the number of substitutions per site units. In clades the first value corresponds to the bootstrap value calculated using the K2 + G + I model and the second value corresponds to the bootstrap value calculated using the GTR + G + I model. Newly obtained sequences are indicated in boldface.


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