Nothotylenchus hexaglyphus Khan & Siddiqi, 1968

Hashemi, Kobra & Karegar, Akbar, 2020, New and known species of Nothotylenchus Thorne, 1941 (Nematoda: Anguinidae) from Iran with an updated list of species, Zootaxa 4729 (4), pp. 482-500 : 491

2. Nothotylenchus hexaglyphus Khan & Siddiqi, 1968

( Figure 5 )

3 females: L = 751 ± 159 (568–851) µm; stylet = 7.3 ± 0.2 (7–7.5) µm; pharynx = 114 ± 11 (103–125) µm; tail = 55.6 ± 5.4 (50.5–61.5) µm; a = 35.7 ± 4.7 (31.9–41.0); b = 6.5 ± 0.9 (5.5–7.4); c = 13.5 ± 2.2 (11.2–15.5); c′ = 4.1 ± 0.4 (3.7–4.5); V = 82.8 ± 1.4 (81.6–84.3); V′ = 89.6 ± 0.4 (89.2–90.1); PUS/VBW = 1.1 ± 0.3 (0.8–1.3); PUS/V-A = 28.4 ± 7.3 (21.9–36.3) %; V-A/T = 1.3 ± 0.2 (1.1–1.5).

2 males: L = 683, 922 µm; stylet = 7, 7.5 µm; pharynx = 103, 157 µm; tail = 57, 64.5 µm; a = 41.9, 56.2; b = 6.6, 5.9; c = 12.0, 14.3; c′ = 4.5, 4.2; spicules = 21, 20.5 µm.

Diagnosis and relationships. Nothotylenchus hexaglyphus is characterised by its medium-sized body, six lateral field incisures, delicate stylet with very small knobs, pyriform or slightly elongated and offset or slightly overlapping basal pharyngeal bulb, posterior position of vulva, very short PUS, long spicules, and rounded tail terminus.

Studied populations of N. hexaglyphus are similar to N. affinis , N. geraerti , N. medians , N. taylori and N. tuberosus , and can be distinguished from all of these species by the very small stylet knobs ( Brzeski 1991). It differs from N. affinis , N. geraerti and N. medians by its longer spicules (20.5–21 vs. 15–17, 14–17.5 and 15–18 µm, respectively), and from N. taylori and N. tuberosus by smaller PUS/VBW ratio (0.8–1.3 vs. 1.8–3.0 and 2.0–2.4, respectively).

Figures

FIGURE 5. Nothotylenchus hexaglyphus. A, C-F, K-I & M: Female. B, G, H & L: Male. A: Lateral fields; B-D: Head & stylet; E: Pharynx; F-I: Basal pharyngeal bulb; J: PUS; K-M: Tail.