Helicotylenchus, Steiner, 1945

Bohra, P., Sanyal, A. K., Hussain, A. & Mitra, B., 2010, Five new records of nematodes from East Antarctica, Journal of Threatened Taxa 2 (6), pp. 974-977 : 975-976

Helicotylenchus dihystera (Cobb, 1893) Sher, 1961 ( Fig. 3 )

Material examined: 5 females, 03.i.1999, coll. B. Mitra, Reg.No. IV/1921.

Host: Wet Moss along with soil at the bank of Priyadarshini Lake (PDL).

Measurements: Females (5): L = 0.54-0.83 mm; a = 20-32; b = 4.5-6.4; c = 44-46; c´ = 1.0-1.3; V = 12-1560 - 6611-13

Description

Female: Body spiral. Cuticle with distinct transverse striae. Lip region continuous with body, hemispherical bearing four annules. Cephalic framework conspicuous. Lateral fields marked by four incisures. Stylet 24-26 µm long, basal knobs concave. Oesophagus with gland overlapping ventrally. Spermatheca rounded offset, without sperms. Tail dorsally convex-conoid usually with slight ventral projection.

Male: Not found.

Distribution: This is a cosmopolitan and widely distributed species.

µm

50

µm

50

Remarks: First time reported from Antarctica.

Order: Dorylaimida Pearse, 1942

Superfamily: Dorylaimoidea De Man, 1876

Family: Qudsianematidae Jairajpuri, 1965

Figures

Figure 3. Helicotylenchus dihystera A - Female Anterior region; B - Posterior region.