Ditylenchus ferepolitor ( Kazachenko, 1980 ) Fortuner & Maggenti, 1987

Hashemi, Kobra & Karegar, Akbar, 2019, Description of Ditylenchus paraparvus n. sp. from Iran with an updated list of Ditylenchus Filipjev, 1936 (Nematoda: Anguinidae), Zootaxa 4651 (1), pp. 85-113 : 92

5. Ditylenchus ferepolitor ( Kazachenko, 1980) Fortuner & Maggenti, 1987

( Figure 3 )

10 females: L = 526 (485–579) µm; stylet = 6.1 (5–7) µm; pharynx = 90.8 (84–98) µm; tail = 53.7 (46–60) µm; a = 37.2 (27.9–45.9); b = 5.8 (5.2–6.7); c = 9.8 (8.9–10.6); c′ = 6.0 (5.0–7.0); V = 74.7 (72.6–76.5); V′ = 83.2 (81.0– 84.6); PUS/VBW = 2.1 (1.6–2.6); PUS/V-A = 34.4 (28.3–47.1) %; V-A/T = 1.5 (1.3–1.8).

3 males: L = 445 (414–489) µm; stylet = 6.1 (6–6.5) µm; pharynx = 92.1 (86–98) µm; tail = 46.1 (45–47) µm; a = 40.8 (38.8–43.6); b = 4.8 (4.6–5.0); c = 9.6 (9.1–10.5); c′ = 5.5 (5.2–5.7); spicules = 12.1 (11.5–13) µm.

Diagnosis. D. ferepolitor is distinctive because of its short body, six lateral field incisures, delicate, very short stylet with posteriorly sloping knobs, pyriform basal pharyngeal bulb (sometimes slightly elongate) and usually offset and sometimes slightly overlapping the intestine (up to 2 µm), position of vulva, rather long post-vulval uterine sac, usually rounded and sometimes dull tail tip, and short spicules.

In drawings in the original description ( Kazachenko 1980) and redescriptions of Brzeski (1984, 1991, 1998), the basal pharyngeal bulb is elongate and offset from intestine, and the tail tip is pointed, while in this study, the basal pharyngeal bulb was often pyriform, short and sometimes with slightly overlapping over intestine and tail was usually rounded ( Figure 1 ). D. ferepolitor is similar to D. apus Brzeski, 1991 , D. filenchulus Brzeski, 1991 , D. geraerti , D. silvaticus , D. stenurus Esmaeili, Heydari, Ziaie & Ye, 2017 and D. virtudesae Tobar-Jimenez, 1964 . It differs from D. apus by greater PUS/VBW ratio (1.6–2.6 vs. 0.2–0.4) and different shape of basal pharyngeal bulb (pyriform and offset vs. elongated and with long overlap), from D. filenchulus by smaller PUS/VBW and c′ (1.6–2.6 and 5.0–7.0 vs. 2.1–4.5 and 7.4–14, respectively), from D. geraerti by greater c′ index (5.0–7.0 vs. 3.5–5.0), different tail shape (medium vs. usually thick) and lower V (72.6–76.5 vs. 80), from D. silvaticus by greater PUS/VBW ratio (1.6–2.6 vs. 0.7–1.7), different tail tip shape (rounded and dull vs. pointed and mucronate) and slightly shorter spicules (11.5–13 vs. 15 μm), and from D. stenurus and D. virtudesae by lower c value (8.9–10.6 vs. 11.1–16.0 and 17.3–20.9, respectively) and greater c′ index (5.0–7.0 vs. 3.3–4.9 and 2.8, respectively).

Figures

FIGURE 1. Ditylenchus paraparvus n. sp. C–H, J & K: Female. A, B, I, L & M: Male. A & F: General shape; B–D: Head & stylet; E: Pharynx; G: Post-vulval uterine sac; H & I: Basal pharyngeal bulb; J: Lateral fields; K & L: Tail; M: Spicules.

FIGURE 3. Ditylenchus ferepolitor. A–D, F & H: Female. E & G: Male. A: Lateral fields; B: Head & stylet; C: Pharynx; D: Post-vulval uterine sac; E & F: Basal pharyngeal bulb; G & H: Tail.