Systematic Study of Dorylaimida from Korea: 2. Description of Two New and Two Known Species of the Family Actinolaimidae from Korea

Abstract

Two known and two new species of the family Actinolaimidae (Nematoda: Dorylaimida) (Thorne, 1939) Meyl, 1960 are described and illustrated. Afractinolaimus zairensis (Baqri et al., 1973) Jairajpuri & Khan, 1992 and Egtitus andhricus Khan and Jairajpuri, 1994 were reported for the first time from Korea. Paractinolaimoides hawangensis n. sp. is 2.9–3.6 mm long, b=3.9–4.5; c=8.8; spicules=73.8–77.4 μm) and differs from the only known species Paractinolaimoides unicus Khan et al., 1994 in having longer body, odontostyle, odontophore, prerectum, spicules and greater number of ventromedian supplements (L=1.9–2.1 mm; odontostyle=21–24 μm; odontophore= 24–26 μm; prerectum=87–105 μm; spicule=54–57 μm and ventromedian supplements= 10–12 in P. unicus). Westindicus cheongsongensis n. sp. is 2.3–2.6 mm long; b=4.2–4.6; c=8.1–9.7; odontostyle=25.2–27.0 μm; spicules=61–65 μm and differs from all known species of the genus in having greater number of ventromedian supplements (15–17 in Westindicus cheongsongensis n. sp. vs. 5–7 in Westindicus brachycephalus, 11 in Westindicus keralaensis and 8 in Westindicus rapax). This new cheongsongensis further differs from Westindicus rapax Hunt, 1978 in having a shorter odontostyle and a lesser ‘V’ value (odontostyle=27–32 μm and V=49–52 in W. rapax); from W. keralaensis Khan et al., 1994 in having longer filiform tail and from W. brachycephalus Thorn, 1967 in possessing longer odontostyle (c=20 and odntostyle=15 μm in W. keralaensis and W. brachycephalus, respectively).