Helicotylenchus densibullatus Siddiqi, 1972

Bohra, Padma, 2012, Twelve species of nematodes: new records for India, Journal of Threatened Taxa 4 (9), pp. 2889-2899 : 2892

Helicotylenchus densibullatus Siddiqi, 1972

( Fig. 1 , E–F and Image 3 A–B)

Material examined: Five females, 31.xii.2009, coll. P. Bohra, Reg.No. IV/2329.

Measurements: Females: L = 0.43–0.44 mm; a = 22–24; b = 4.7–6.2; c = 42–44; c´ = 0.76–0.90; V = 65–67.

Description: Female: Body spirally coiled upon fixation. Lip region hemispheroid and marked by three distinct annules. Labial sclerotization moderate. Lateral fields marked by four incisures, outer ones slightly crenate. Stylet 21–23 µm long. Median oesophageal bulb spheroidal in shape. Excretory pore opposite to oesophago–intestinal junction. Ovaries paired. Intestine not exceeding into rectum. Tail dorsally convex–conoid to a short usually acute ventral projection, with 7–10 annules. Annules becoming slightly coarser ventrally towards distal end.

Habitat and locality: Collected from soil around roots of Banana ( Musa balbisiana ) from Kakarwa district, Rajasamand, Rajasthan, India.

Remarks: H.densibullatus is characterized in having basal knobs of stylet appearing to be amalgamated with the shaft, not distinctly marked off individually (hence specific name); it comes closer to H. indicus Siddiqi, 1963 which has narrow truricurate lip region, indistinct labial annules, a more conspicuous labial sclerotization, from H. elegans Roman, 1965 has well separated anteriorly cupped stylet knobs. Lip region bearing five or six annules.

Figures

Figure 1. Zanenchus zanchus Siddiqi, 1979 A - Anterior end; B - Posterior end. Helicotylenchus californicus Sher, 1966 C - Anterior end; D - Posterior end. Helicotylenchus densibullatus Siddiqi, 1972 E - Anterior end; F - Posterior end. Helicotylenchus minzi Sher, 1966 G - Anterior end; H - Posterior end. Helicotylenchus talonus Siddiqi, 1972 I - Anterior end; J - Posterior end. Neodolichorhynchus judithae (Andrássy, 1962) Jairajpuri & Hunt, 1984 K - Anterior end; L - Posterior end.