Four new and six known species of the genus Dorylaimellus Cobb, 1913 (Nematoda: Belondiridae) from India Author Ahmad, Wasim Author Naz, Tabbasam text Journal of Natural History 2012 2012-12-31 46 45 - 46 2787 2828 http://dx.doi.org/10.1080/00222933.2012.724722 journal article 10.1080/00222933.2012.724722 1464-5262 4652734 Dorylaimellus (Jamilius) filamentosus ( Siddiqi, 1983 ) Jairajpuri and Ahmad, 1992 ( Figures 18 and 19 ; Table 10 ) Description Female. Body curved ventrad upon fixation, tapering towards both extremities. Cuticle with fine transverse striations, 1.0– 1.5 µm thick at mid body and 1.5 µm on tail. Lateral chords with indistinct glandular organs, about one-quarter to one-third as wide as body width at mid body. Lateral, dorsal and ventral body pores indistinct. Lip region distinctly offset, about twice as wide as high or about one-quarter to one-third as wide as body width at neck base. Peri-oral disc distinct. Cheilostome a truncate cone with refractive walls and distinct cuticularized plates around oral aperture. Amphids cup-shaped, their aperture about 0.9 times as wide as lip region width. Odontostyle about 1.0–1.2 times lip region width long, its aperture about one-third of its length. Odontophore rod-like with basal flanges, 1.6–1.7 times the odontostyle length. Nerve ring at 37–41% of neck length from anterior end. Pharyngeal expansion abrupt; flexure present at the expansion of pharynx; expanded part occupying about 34–41% of total neck length, enclosed in a thick sheath of dextrally spiral muscles. Cardia short, conoid, about one-third of the corresponding body width long. Genital system amphidelphic; both the sexual branches almost equally developed. Ovaries reflexed, measuring 60–75 µm (anterior) and 50–70 µm (posterior) with oocytes arranged in a single row except near tip. Oviduct joining ovary subterminally, not differentiated, measuring 55–65 µm (anterior) and 45–55 µm (posterior) long. Sphincter at oviduct–uterus junction not well developed. Uterus a simple undifferentiated tube, measuring 35–60 µm (anterior) and 35–40 µm (posterior). Vulva a large pore. Vagina extending inward, about one-half of corresponding body width deep; pars proximalis vaginae 12–15 µm with convex walls; pars refringens vaginae absent; pars distalis vaginae 2–3 µm with rounded walls. Prerectum about four times anal body width long. Rectum about as long as anal body width. Tail first convex conoid and then long filamentous, 11–13.8 times anal body width long. Caudal pores two on each side. Male. Not found. Habitat and locality From the forest area of Barapani (dam area), Shillong, Meghalaya state ; 25 ◦ 57 ′ 0 ′′ N; 91 ◦ 88 ′ 0 ′′ E; altitude 1496 m above sea level. Remarks Siddiqi (1983) proposed the genus Jamilius and described the species Jamilius filamentosus under this genus from Fiji . Jairajpuri and Ahmad (1992) considered the genus Jamilius a subgenus of Dorylaimellus and transferred all its species to Dorylaimellus . The present population confirms well with the original description. In having long filiform tail D. ( J. ) filamentosus comes close to D. salvus ( Siddiqi, 1968 ) Jairajpuri and Ahmad, 1992 but differs in having longer body length (L = 1.3–1.8 vs L = 1.17–1.23 mm ), longer odontostyle (odontostyle = 8.5–9 vs 6–7 µm ) smaller pharynx (b = 8.2–10.4 vs 6.5–8.0), longer tail (c = 6.5–7.6 vs 8–10, c′ = 11–13.8 vs 9–10), shorter prerectum (4 vs 5–7.3 times anal body width long) and absence of male (vs male present). This species is reported here for the first time from India . Figure 18. Dorylaimellus (Jamilius) filamentosus ( Siddiqi, 1983 ) Jairajpuri and Ahmad, 1992 . (A) Entire female, (B) anterior region, (C) anterior end showing amphid, (D) pharyngeal region, (E) expanded part of pharynx, (F) female genital system, (G) vulval region, (H,I) female posterior region. Figure 19. Dorylaimellus (Jamilius) filamentosus ( Siddiqi, 1983 ) Jairajpuri and Ahmad 1992 . (A,B) Anterior region, (C) anterior end showing amphid, (D) expanded part of pharynx, (E) vulval region, (F,G) vulval region in ventral view, (H) female posterior region, (I) female tail tip. Scale bars: A–C, F, G = 10 µm; D, E, H, I = 20 µm. Table 10. Measurements of Dorylaimellus (Jamilius) filamentosus (Siddiqi , 1983) Jairajpuri and Ahmad, 1992 .