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During investigation on the plant parasitic nematodes on bananas in North and Central provinces of Vietnam carried out in 1995 two new species were found, Hirschmanniella bananae n.sp. and Scutellonema tanlamese n.sp. Hirschmanniella bananae n.sp. is characterized by having 6 annuli in lip region, areolation of entire lateral field and presence of a mid-terminal mucro at the tail end. The new species is close to H. shamini Ahmad, 1972 but differs from H. shamini by longer body length in females (1450-1750 µm vs 1190-1360 mm), longer stylet longer (18-20.5 mm vs 16-19 mm) and longer spicule longer (28-29.5 mm vs 22-25 mm). Scutellonema tanlamese n.sp. is characterized by lip region with three annuli and numerous longitudinal ridges (18) in basal annulus and structure of lateral field at the tail region with inner lines extending to tail terminus. The new species is closest to S. brachyurus type B (African populations) described by Van Den Berg et al. in 2013 but can be distinguished by body length shorter (643-708 µm vs 777-820 µm), stylet length shorter ((24.5-26.5 µm vs 28-29.5 mm, and also by structure of lateral field with two inner lines going throught at tail region and vulval edge distinct with epiptygma appearing double and folded into vagina. Citation: Nguyen Ngoc Chau, 2017. Two new species of plant parasitic nematodes Hirschmanniella bananae n.sp. (Nematoda: Pratylenchidae) and Scutellonema tanlamense n.sp. (Nematoda: Hoplolaimidae) associated with banana in Vienam. Tap chi Sinh hoc, 39(3): 253-263. DOI: 10.15625/0866-7160/v39n3.10665. *Corresponding author: nguyengochau.iebr@gmail.com Received 19 August 2017, accepted 12 September 2017

Bakernema enormese sp. n., collected from rhizosphere of forest wood trees in Muong Phang, Dien Bien Province (north Vietnam) is described and illustrated. The new species is characterized by large body size and stylet. In general, this new species is close to two existing species of the same genus, B. inaequale and B. dauniense by cuticle structure in transparent membranous projections which appear in lateral view as spine-like structures on each annulus. These structure arranged into several rows along the body. In morphology, the new species differs from B. inaequale and B. dauniense by body and stylet length, i.e. 609–842 µm and 143.5–150 µm vs. 391–578 µm and 59–74 µm for B. inaequale and vs. 391–461 µm and 65–74 µm for B. dauniense. In addition, new species can be distinguished from B. inaequale by the longer membranous projection, 8–12 vs. 6–10 µm and vagina shape, curved vs. sigmoid. From B. dauniense, the new species differs by the much longer membranous projection, 8–12 vs. 1.4–2.2 µm and less number annules between vulva and tail end (RV), 3–4 vs. 7.8 annules. The presence of Criconema (Nothocriconemella) graminicola Loof, Wouts & Yeates, in Vietnam with morphometrics, illustrators and remarks given.

Investigations on entomopathogenic and plant parasitic nematodes in some natural forests in the Ngoc Linh mountain (Quang Nam province) and the Thuong Xuan forest (Thanh Hoa province) revealed three new species of plant parasitic nematodes belonging to the genus Helicotylenchus Steiner, 1945 (Nematoda: Hoplolaimidae). These new species were named Helicotylenchus castanus sp. n., Helicotylenchus madhucus sp. n. and Helicotylenchus digitus sp. n. with morphological characteristics described and illustrated. The new species Helicotylenchus castanus sp.n. is characterized by the highly hemispherical shape of the lip region, extremely short and rounded tail without projection. The second new species Helicotylenchus madhucus sp. n. is characterized by high lip region with 4-5 annuli, hemispherical and not set off from body contour, stylet 31.3-35.9 (33.3 ± 1.3) µm long, tail with a short ventral projection and the presence of males in the population. The third new species, Helicotylenchus digitus sp.n. was recognized by broad rounded tail with strong annulated projection in the digital shape, and also the presence of males in population.