Description of Longidorus zhengi n. sp. (Nematoda: Longidoridae) from the rhizosphere of Quercus aliena in China

Summary Longidorus zhengi n. sp. was recovered in the rhizosphere of Quercus aliena in China. The new species is characterised by medium-length females (3.2-4.0 mm), lip region slightly offset, anteriorly flat and separated from the rest of the body by constriction, funnel-shaped amphidial pouches, a simple guiding ring located at 57.0-60.0 μ m distance from the anterior end, stylet composed of a moderately long odontostyle (108.0-139.0 μ m) and weakly developed odontophore (56.0-68.0 μ m), 61.0-74.0 μ m long pharyngeal bulb, well-developed offset cardia, and a short conical tail with widely rounded terminus. The species has four juvenile developmental stages (J1-J4) and no male was found. The matrix codes of the new species are: A45-B23-C5-D2-E1-F2-G1-H1-I1-J1-K5. The new species was molecularly characterised using ITS1 and 28S D2-D3 rRNA gene sequences. The phylogenetic analyses placed L. zhengi n. sp. with several species described from the mainland of China, which were clustered with L. litchi , L. diadecturus and L. juglans .