A New Species of Hoplolaimus (Basirolaimus) (Hoplolaiminae : Tylenchida) from Pigeon Pea Ecosystem of Bumdelkhand Region

A new species of plant parasitic nematodes, Hoplolaimus (Basirolaimus) puriensis sp. n. was found from pigeon pea ecosystem in Hamirpur district, Bundelkhand region of Uttar Pradesh, India is described and illustrated. H.(B.) puriensis is characterised by having complete aerolation on lateral fields through out body, lateral lines terminate before anal region and not reaching till tail end. One phasmid located far anterior to vulva, another post vulval. H.(B.) puriensis sp. n. resembles with Hoplolaimus (Basirolaimus) seinhorsti but differs in having more lateral lines (i.e. four lateral lines vs. one to three in Hoplolaimus (B.) seinhorsti) different position of excretory pore, i.e. excretory pore below nerve ring in H.(B.) puriensis vs. excretory pore adjacent to nerve ring in Hoplolaimus (B.) seinhorsti. Most important character of this new species is the presence of lesser number of nuclei in dorsal oesophageal gland instead of six nuclei, there are only four nuclei located on dorsal oesophageal gland. Hoplolaimus (B.) seinhorsti has longer stylet i.e. 40-49 μm (vs. stylet 32-35 μm in H.(B.) puriensis sp.n.). H.(B.) puriensis also resembles with Hoplolaimus (Basirolaimus) indicus but differs in having smaller spicules 32 μm (vs. 34-42 μm in H. (B.) indicus); H.(B.) puriensis sp. n. has smaller stylet 32-35 μm vs. H. (B.) indicus stylet, 33-47 μm.