Pristionchus purgamentorium, Kanzaki & Herrmann & Weiler & Röseler & Theska & Berger & Rödelsperger & Sommer, 2021

Kanzaki, Natsumi, Herrmann, Matthias, Weiler, Christian, Röseler, Waltraud, Theska, Tobias, Berger, Jürgen, Rödelsperger, Christian & Sommer, Ralf J., 2021, Nine new Pristionchus (Nematoda: Diplogastridae) species from China, Zootaxa 4943 (1), pp. 1-66 : 58-63

Pristionchus purgamentorium n. sp.

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Etymology. The species name is derived from the finding circumstances. The beetle was collected on a dumpster (lat. purgamentum = trash).

Measurements. See Table 6

Adult. General characters are as described above for maupasi -group.

Stenostomatous form. Dorsal movable tooth flint-shape, anterior end slightly curved; left subventral ridge with three or sometimes more minute pointed and adventitious denticles on a plate, most dorsal denticle often masked by middle denticle; right subventral ridge with two or three bluntly pointed adventitious denticles.

Eurystomatous form. Dorsal movable tooth claw-like as typical of the genus; left subventral ridge with three large plates, each often has two or three split tips; right subventral movable tooth claw-like, an indistinctive extra peak sometimes seen.

Male. As described above for maupasi -group.

Female. As described above for maupasi -group.

Diagnosis and relationships. Pristionchus purgamentorium n. sp. is characterized by the slightly anteriorly curved flint-shaped dorsal tooth, the left subventral ridge with three or sometimes more pointed denticles and right subventral ridge with two or three small bluntly pointed denticles of stenostomatous form, claw-like right subventral stegostomal tooth sometimes with an indistinctive extra peak in eurystomatous form, the arrangement of male genital papillae, <v1, v2, v3d, co, v4, ad, ph, (v5, v6, v7, pd)> where posterior four paired papillae form a cluster, and distinctive and long tail of both sexes. The maupasi- group currently contains 16 species including P. dorci n. sp.. These species are typologically similar to each other, but can be distinguished by the stomatal characters, e.g., number of denticles, and the arrangement of genital papillae (summarized in Kanzaki et al., 2018). Pristionchus purgamentorium n. sp. shares its multiple-peaked right subventral plate in the stenostomatous form and the laterally directed third paired male genital papillae (v3d) with P. maxplancki , which have one to two-peaked right subventral ridge and v3d papillae. The new species also shares multiple-peaked right suvbentral plate of stenostomatous form with P. riukiariae Kanzaki, Herrmann, Yoshida, Weiler, Rödelsperger & Sommer, 2018 . However, P. purgamentorium n. sp. is distinguished from P. maxplancki by its right subventral plate of stenostomatous form, with two to three ridges vs. one to two ridges. P. purgamentorium n. sp. is also distinguished from P. riukiariae by right subventral plate of stenostomatous form, with two to three ridges vs. two ridges, and the arrangement of genital papillae, third vs. second pair directed laterally (v3d vs. v2d), and second and third pairs are separated vs. very close to each other. Further, the new species is distinguished from all other species by mating experiments and also characterized by a ca. 1,600-bp fragment of the SSU rRNA gene (GenBank accession number MW017224 ), the sequence of which is distinct from that of all other Pristionchus species.

Type host and locality. Isolated from a beetle of the genus Mimela ( Coleoptera : Rutelidae ) at a dumpster near Ganquan, Shaanxi province, PRC.

Type material and type strain. Type strain RS6138 frozen at the nematode collection of the MPI Tübingen and available as living culture upon request. Voucher specimens sent to the following museums: Holotype male, Paratype male and female: Museum für Naturkunde Karlsruhe , Germany ; Paratype male and female: Swedish Natural History Museum, Stockholm, Sweden ; Paratype male and female: University of California in Riverside Nematode Collection ( UCRNC), Riverside , CA, USA .