Systematic Study of Dorylaimida from Korea: 3. Three New and Four Known Species of Dorylaimida from Korea

Abstract

Three new and four known species of dorylaim nematodes are described and illustrated. Lenonchium asterocaudatum n. sp. is 2.5–3.1 mm long; c=17.3–25.1; odontostyle=16–19 μm and resembles Lenonohium oryzae Siddiqi, 1965 and Lenonohium macrodorum Ahmad and Jairajpuri, 1988 but differs from the former in the presence of 4–5 projections (mucronate) or starshaped structures on the tail tip in both sexes and from the latter in having a shorter odontostyle (33–35 μm in L. macrodorum). Paravulvus kyeryongensis n. sp. is 0.9–1.1 mm long; c=49.5–67; odontostyle=5.8–7.3 μm and comes close to Paravulvus papillatus and Paravulvus teres but differs from P. papillatus in having a longer and slender body (L=1.31–1.49 mm; a=41–46 vs. L=0.94–1.22 mm; a=30–36); shorter odontostyle (6–7 μm vs. 8–9 μm) and lesser ‘Vrsquo; value (48–49 vs 51–53); from P. teres differs in having longer prerectum (38–54 μm vs. 28–36 μm). Proleptonchus parkerus n. sp. is 1.3–1.4 mm long; c=82.3; odontostyle=5.1–5.8 μm and comes close to Proleptonchus indicus, Proleptonchus saccatus, Proleptonchus lacihoveyensis, and Proleptonchus johnsoni because of the presence of post uterine sac with rudimentary oviduct and ovary, but differs from all of them in having a prerectal chamber before it joins rectum. The new species also differs from P. saccatus in having non-duplex amphids and a much smaller basal bulb (33.5–40.1 μm vs 51.2–54.4 μm); from P. johnsoni in having smaller posterior uterine sac (4 vs. 2 body width); from P. lacihoveyensis in having non-duplex amphids. P. indicus, the most close to new species but have a smaller posterior uterine sac (55.8–75.6 μm vs 94 μm). Aquatides intermedius, Axonchium asacculum, Axonchium vaginatum and Paravulvus papillatus were recorded for the first time from Korea.