Helicotylenchus talonus Siddiqi, 1972

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

Helicotylenchus talonus Siddiqi, 1972

( Fig. 1 , I–J and Image 5 A–B)

Material examined: 3 females, 31.xii.2009; coll. P. Bohra, Reg.No. IV/2344.

Measurements: Females: L = 0.41–0.46 mm; a = 22–24; b = 5.8–6.5; c = 1.1–1.2; c´ = 0.8–0.9; V = 62–66.

Description: Female: Body spirally curved upon fixation. Lateral fields marked by four incisures. Lip region hemispheroid, distinctly marked by 4–5 labial annules. Stylet 19–20µm long; basal knobs large with flattened to concave anterior surface–median oesophageal bulb oval. Ovaries paired. Tail dorsally convex–conoid, with 3–7 annules ventrally and a large, bluntly rounded, claw–like unstriated ventral projection.

Habitat and locality: Collected from soil around roots of Lemon ( Citrus reticulate ) at Kakarwa, Rajasamand District, Rajasthan, India.

Remarks: H. talonus Siddiqi, 1972 comes close to H. glissus Thorne & Malek, 1968 ; H. bradys Thorne & Malek, 1968 and H. borinquensis Roman, 1965 . From H. glissus it differs in having a distinctly annulated lip region, a wider tail projection and inner incisures of the lateral fields usually fusing distally on tail. From H. bradys it can be differentiated by spear length (spear 29–33 µ long in H. bradys ), finer body annules (3µ wide at mid– body in H. bradys ) and fewer tail annules. From H. borinquensis it can be separated by its fewer tail annules, a large tail projection and phasmids which are closer to the anal level.

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.