Sauertylenchus maximus ( Allen, 1955 ) Siddiqi, 2000

Azizi, Kourosh, Eskandari, Ali, Karegar, Akbar, Ghaderi, Reza, Elsen, Sven Van Den, Holterman, Martijn & Helder, Johannes, 2022, Analyses of morphological and molecular characteristics of Telotylenchinae from Iran point at the validity of the genera Bitylenchus and Sauertylenchus, Zootaxa 5169 (5), pp. 425-446 : 434-435

Sauertylenchus maximus ( Allen, 1955) Siddiqi, 2000

Syn: Bitylenchus maximus ( Allen, 1955) Siddiqi, 1986

Tylenchorhynchus maximus Allen, 1950

Tylenchorhynchus wilskii Kornobis, 1980 ( Brzeski, 1998)

Bitylenchus wilskii (Kornobis, 1980) Jairajpuri, 1982

Bitylenchus wilskii (Kornobis, 1980) Siddiqi, 1986

( Figure 4 , Table 3 )

Description

Female

Body curved ventrally to C-shaped after heat fixation. Cuticle with distinct annuli, 1.5–2.3 μm wide at midbody. Lateral field with four longitudinal incisures, outer bands areolated. Lip region offset, hemispherical, 8.0– 9.0 μm wide at base, 4.0–5.0 μm high, and bearing six or seven distinct transverse annuli. Cephalic framework lightly sclerotized, outer margins extending over two or three body annuli. Stylet moderately strong, knobs rounded, slightly directed posteriorly; the conus almost half of the total stylet length. Dorsal pharyngeal gland orifice located 2.0–2.1 μm behind stylet knobs. Median pharyngeal bulb oval, 12–13 μm wide; basal bulb pyriform, abutting anterior intestine. Reproductive system didelphic, amphidelphic, spermatheca elongated, empty. Vagina 10 μm long, 40–60% of the vulval body diameter. Intestinal fasciculi present throughout intestine and inside post rectal sac which enters into about two-thirds of the tail length. Tail cylindrical with a hemispherical, annulated terminus, bearing 33–40 annuli on ventral side. Hyaline portion thickness 6–7 μm. Phasmids located 16–17 μm posterior to anus, in the anterior half of the tail.

Male Not found.

Remarks

Compared to the original description of S. maximus by Allen (1955), the Iranian populations differ by the absence of males. The Iranian populations of S. maximus were recovered from Semnan, Ardabil and West Azerbaijan provinces in the rhizosphere of peach ( Prunus persica ), grass, hawthorn ( Crataegus aronia ) and apple ( Malus pumila ), respectively.

Figures

FIG. 4. Photomicrographs of Sauertylenchus maximus. Females (A–O).A: Pharynx; B–E: Head and stylet; F: Terminal bulb; G &H: Lateral field; I: Vulva; J: Entire body; K–O: Tail. (Scale bars: A = 20 μm; J = 100 μm; B–I & K–O = 10 μm); [a = anus].