Dorylaimellus (Axodorylaimellus) deviatus Baqri and Jairajpuri, 1969

Ahmad, Wasim & Naz, Tabbasam, 2012, Four new and six known species of the genus Dorylaimellus Cobb, 1913 (Nematoda: Belondiridae) from India, Journal of Natural History 46 (45 - 46), pp. 2787-2828 : 2812-2815

Dorylaimellus (Axodorylaimellus) deviatus Baqri and Jairajpuri, 1969

( Figures 12 E–H and 13; Table 7)

Description

Female. Body curved ventrad upon fixation, tapering towards both extremities. Cuticle with fine transverse striations, more pronounced towards extremities, 1.5–2.0 µm thick at mid body and 3–4 µm on tail. Lateral chords with weak glandular bodies, about one-third as wide as body width at mid body. Lateral, dorsal and ventral body pores indistinct. Lip region offset by distinct constriction, about twice as wide as high or about one-third of body width at neck base. Inner labial papillae raised, forming disc-like structure. Cheilostome a truncate cone with refractive walls and cuticularized plates around oral aperture. Amphids stirrup-shaped, their aperture about 0.8 times as wide as lip region width. Odontostyle about 0.8–1.0 times lip region width long, its aperture about one-third of its length. Odontophore rod-like with basal flanges, about twice the odontostyle length. Nerve ring at 33–36% of neck length from anterior end. Pharyngeal expansion gradual; expanded part occupying about 50–57% of total neck length, enclosed in a thick sheath of dextrally spiral

and Jairajpuri, 1969. muscles. Cardia short, rounded, about one-half of the corresponding body width long. Genital system amphidelphic; both the sexual branches almost equally developed. Ovaries reflexed, small, reaching or surpassing the oviduct–uterus junction, measuring 15–20 µm (anterior) and 20–25 µm (posterior) with oocytes arranged in a single row except near tip. Oviduct joining ovary subterminally, with no clear demarcation, measuring 12–15 µm (anterior) and 13–16 µm (posterior). Sphincter indistinct but slight demarcation present at oviduct–uterus junction. Uterus a simple, short tube, measuring 8–10 µm (anterior) and 9–12 µm (posterior). Vulva transverse. Vagina extending inward, about half of corresponding body width; pars proximalis vaginae 4–6 µm long with sigmoid walls; pars refringens vaginae absent; pars distalis vaginae 2–3 µm with rounded walls. Prerectum about 3–4 times anal body width long. Rectum 0.8–1.0 anal body width. Tail short, hemispheroid, 1.2–1.5 times anal body width long. Caudal pores two on each side.

Male. Not found.

Habitat and locality

Rocky soil with unidentified grasses from Kargil, Ladakh , Jammu and Kashmir; 34 ◦ 34 ′ 12 ′′ N, 76 ◦ 6 ′ 0 ′′ E, altitude 2760 m above sea level .

Remarks

Baqri and Jairajpuri (1968) described Dorylaimellus clavatus from Rampur, India. Later, in 1969 they renamed it as Dorylaimellus deviatus because the name clavatus was pre-occupied. In the presence of peri-oral disc and a transverse vulva D. deviatus fits under the subgenus Axodorylaimellus Jairajpuri and Ahmad, 1980 . The present population despite inhabiting the soil at an altitude of 3500 m above sea level, conforms well with the measurements and description of the type specimens described from the plain area of India having lower altitude.

Figures

Figure 12. (A-D) Dorylaimellus (Axodorylaimellus) parvulus Thorne, 1939. (A) Anterior region, (B) expanded part of pharynx, (C) vulval region, (D) female posterior region showing prerectum. (E–H) Dorylaimellus (Axodorylaimellus) deviatus Baqri and Jairajpuri, 1969. (E) Anterior region, (F) expanded part of pharynx, (G) vulval region, (H) female posterior region. Scale bars: A, E = 10 µm; B–D, F–H = 20 µm.