Enchodelus zonatus, 1967

Shamim Jairajpuri, M. & Loof, P. A. A., 1967, On Some Species of Enchodelus Thorne, 1939 from India (Nematoda: Dorylaimidae), Nematologica 13 (4), pp. 501-508 : 506-507

ENCHODELUS ZONATUS N. SP .

( Fig. 4 )

One female. Dimensions: L = 1.73 mm; a = 38;b = 5.1; c = 30; V = 1?4611.

Body slender, widely curved ventrally in death. Cuticle 3 fL thick, smooth externally, with very fine transverse striation internally. Lateral chord one-third as wide as body, containing globules interspersed by granular parts; perhaps these are glands, but no external pores were visible. Lip region slightly more than one-third as wide as body at base of oesophagus, offset by constriction; nearly thrice as wide as high, contours rounded. Papillae of outer circle not projecting, those of inner circle projecting distinctly as low rounded elevations. Spear 34 p long, 2.5 5fLwide, the aperture one-seventh of its length; spear length equal to twice width of lip region. Spear extensions 37 p long, linear, not forming flanges, ending in small knobs. Amphids stirrup-shaped, more than half as wide as lip region. Guiding ring double, distance from its anterior margin to head end equal to width of lip region. Posterior two-fifths of oesophagus (from head end) widened, about 315 as wide as body. Nerve ring at 40 % of neck length from head end; some distinct ganglia between nerve ring and oesophageal expansion. Hemizonid conspicuous, running from mid-ventral line to the lateral chords as band 4 p wide. Cardia roundish, slightly shorter than wide. Vulva probably transverse. Depth of vagina 60 % of body width; vagina distinctly sclerotized. Gonads paired, opposed and reflexed. Tail straight, conoid with blunt tip; two anal body widths long. Rectum as long as anal body diameter, prerectum seven times as long as rectum or 63 % of neck length.

Holotype. Female on slide WT 686 of the Nematode Collection of the Plantenziektenkundige Dienst, Wageningen, Netherlands .

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Type habitat and locality. Soil around roots of apple, Srinagar , Kashmir , India.

Diagnosis: Though only one specimen was available, this differs clearly from other species and is in good condition, so that we think it justified to base a species description upon it. E. zonatus shares the conoid, straight tail with E, conicaudatus ( Ditlevsen, 1927) Thorne, 1939, from which it differs by the much longer spear: 34 tt against 18 tt (based upon Ditlevsen's drawing and upon examination of recent specimens from Spitzbergen); extensions included 71 p against 45 Also the lip region is much lower and broader. The ratio "spear length: width of lip region" is 2.0 in zonatu.r, 1.5-1.6 in conicaudatu.r.

Figures

Fig. 4 Embodc//ıf zonafus n. sp .. female. A: oesophageal region; B: anterior end; C: vulva; D: tail.