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<p>The genus <italic>Pristionchus</italic> (Kreis, 1932) consists of more than 30 soil nematode species that are often found in association with scarab beetles. Three major radiations have resulted in the “<italic>maupasi</italic> species group” in America, the “<italic>pacificus</italic> species group” in Asia, and the “<italic>lheritieri</italic> species group,” which contains species from Europe and Asia. Phylogenetic analysis indicates that a group of three species, including the gonochorists <italic>P. elegans</italic> and <italic>P. bucculentus</italic> and the hermaphrodite <italic>P. fissidentatus</italic>, is basal to the above-mentioned radiations. Two novel species are described here: <italic>Pristionchus paulseni</italic> sp. n. from Taiwan and <italic>P. yamagatae</italic> sp. n. from Japan by means of morphology, morphometrics and genome-wide transcriptome sequence analysis. Previous phylotranscriptomic analysis of the complete <italic>Pristionchus</italic> genus recognized <italic>P. paulseni</italic> sp. n. as the sister species of <italic>P. fissidentatus</italic>, and thus its importance for macro-evolutionary studies. Specifically, the gonochorist <italic>P. paulseni</italic> sp. n. and the hermaphrodite <italic>P. fissidentatus</italic> form a species pair that is the sister group to all other described <italic>Pristionchus</italic> species. <italic>P. paulseni</italic> sp. n. has two distinct mouth forms, supporting the notion that the mouth dimorphism is ancestral in the genus <italic>Pristionchus</italic>.</p>
</abstract>

The genus Pristionchus (Kreis, 1932) consists of more than 30 soil nematode species that are often found in association with scarab beetles. Three major radiations have resulted in the “maupasi species group” in America, the “pacificus species group” in Asia, and the “lheritieri species group,” which contains species from Europe and Asia. Phylogenetic analysis indicates that a group of three species, including the gonochorists P. elegans and P. bucculentus and the hermaphrodite P. fissidentatus, is basal to the above-mentioned radiations. Two novel species are described here: Pristionchus paulseni sp. n. from Taiwan and P. yamagatae sp. n. from Japan by means of morphology, morphometrics and genome-wide transcriptome sequence analysis. Previous phylotranscriptomic analysis of the complete Pristionchus genus recognized P. paulseni sp. n. as the sister species of P. fissidentatus, and thus its importance for macro-evolutionary studies. Specifically, the gonochorist P. paulseni sp. n. and the hermaphrodite P. fissidentatus form a species pair that is the sister group to all other described Pristionchus species. P. paulseni sp. n. has two distinct mouth forms, supporting the notion that the mouth dimorphism is ancestral in the genus Pristionchus.

Two new Species of <italic>Pristionchus</italic> (Nematoda: Diplogastridae) include the Gonochoristic Sister Species of <italic>P. fissidentatus</italic>


Journal of Nematology

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Two new Species of  (Nematoda: Diplogastridae) include the Gonochoristic Sister Species of 


running-head

The genus Pristionchus (Kreis, 1932) consists of more than 30 soil nematode species that are often found in association with scarab beetles. Three major...

Two new Species of Pristionchus (Nematoda: Diplogastridae) include the Gonochoristic Sister Species of P. fissidentatus

Article Category: Arts & Humanities

Published Online: Apr 24, 2019

Page range: 1 - 14

Received: Mar 27, 2018

DOI: https://doi.org/10.21307/jofnem-2019-024

© 2019 Matthias Herrmann et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.