Crassolabium persicum Jabbari, Niknam, Vinciguerra, Shalaleh Moslehi, Abolafia & Peña-Santiago 2012

Adult. Slender nematodes of medium size, 1.92–2.40 mm long. Body cylindrical, slightly tapering towards both ends. Habitus more or less curved ventrad upon fixation, adopting an open ‘C’ shape. Cuticle dorylaimoid, with very fine transverse striation, sometimes difficult to distinguish; 3.5–5.0 μm thick in anterior region, 5.5–8.0 μm at mid–body and 8–13 μm on tail. Lateral chord 10–18 μm wide at mid–body, occupying 15–30% of mid–body diameter; lateral pores readily visible, arranged in two rows along both margins of lateral chord. Lip region truncate, somewhat angular, offset by marked constriction, 3.0–4.0 times as broad as high and 25–36% of body diameter at neck base; lips moderately separated; labial and cephalic papillae protruding. Amphid fovea funnel–like, its opening occupying 10–11 μm or three–fifths (60%) of lip region diameter. Odontostyle quite robust, wider than adjacent cuticle, 4–6 times as long as wide, 1.0–1.1 times the lip region diameter and 0.8–1.1% of body length; aperture occupying less than one–third (27–30%) its length. Guiding ring simple but distinct, at 10–12 μm or 0.5–0.7 times the lip region diameter from anterior end. Odontophore rod–like, lacking any differentiation, 1.1–1.4 times the odontostyle length. Pharynx consisting of a slender but muscular anterior portion enlarging gradually; basal expansion 9–11 times as long as broad, 5.3–6.0 times longer than body diameter at neck base, and occupying more than half (54–56%) of total neck length; pharyngeal gland nuclei situated as follows: DO = 46–50%, DN = 48–53%, S1N1 = 72–76%, S1N2 = 76–81%, S2N = 87–90%. Of note, S1N are significantly smaller than S2N. Nerve ring located at 155–187 μm or 32–41% of total neck length. Cardia tongue–like, 12–19 x 11–16 μm and surrounded by intestinal wall. Female. Genital system didelphic-amphidelphic, with both branches well and equally developed, the anterior 364–476 μm long or 15–18% of total body length, and the posterior 358–395 μm long or 14–16% of total body length. Ovaries reflexed, moderately developed, sometimes reaching and surpassing the sphincter level; the anterior 114–131 μm, the posterior 101–127 μm long; oocytes arranged distally in several rows and then proximally in a single row. Oviduct joining ovary, 88–130 μm long or 1.3–1.8 body diameters and consisting of a tubular part and a moderately developed pars dilatata with small lumen. Oviduct-uterus junction marked by a distinct sphincter. Uterus 162–218 μm long or 2.3–3.5 times the corresponding body diameter, bipartite, i.e., consisting of two sections with variable length: a wider proximal region with distinct lumen containing abundant sperm cells, and a distal part with narrow lumen and globular walls surrounded by circular muscles. Vagina extending inwards 32–45 μm or less than half (36–44%) of the corresponding body diameter; pars proximalis longer than wide, 26–40 × 19–22 μm, with slightly sigmoid walls and surrounded by moderately developed musculature; pars refringens with (in lateral view) two distinct, trapezoidal, closely-spaced pieces, measuring 6–8 × 8–11 μm and with a combined width of 17–21 μm; pars distalis very short, with two small sclerotizations close to the pars refringens. Vulva a post–equatorial longitudinal slit appearing in lateral view as a short longitudinal depression. Prerectum 1.3–2.1 anal body diameters long, with a well developed blind sac. Rectum 0.9–1.3 times the anal body diameter. Tail short, conical with rounded tip to conoid, ventrally nearly straight, dorsally more convex. Two pairs of caudal pores, one subdorsal, other lateral or subventral. Male. Genital system diorchic, with opposite testes. In addition to the adcloacal pair, situated at 22–27 μm from cloacal aperture, there is a series of 13–17 shortly and regularly spaced (11–16 μm apart) ventromedian supplements, outside the range of spicules; posterior-most ventromedian supplement located at 47–53 μm from adcloacal pair. Spicules strongly curved ventrad and moderately robust, 4.0–5.0 times as long as wide and 1.6–1.7 anal body diameter long. Lateral guiding pieces short and robust, 11–16 μm long, 2.5–4.0 times as long as wide, with bifurcate terminus in which the posterior arm is visibly longer than the anterior one. Prerectum length 1.7–2.3 times the anal body diameter. Tail somewhat more conoid than that of female.