Olopachys iraniensis, Mojahed & Hajizadeh & Hosseini & Ahadiyat, 2019

Mojahed, Samaneh, Hajizadeh, Jalil, Hosseini, Reza & Ahadiyat, Ali, 2019, A new species of Olopachys Berlese (Acari: Pachylaelapidae) from Iran with a key to the world species, Acarologia 59 (1), pp. 46-56 : 47-50

Olopachys iraniensis n. sp.

( Figures 1–3 , 4C )

Diagnosis (Female)

Movable digit of chelicera with a subterminal tooth and terminal hook, fixed digit with two subterminal teeth and distal hook; base of epistome finely denticulated lateraly, epistome with narrow subdistal neck and long apical serration; posterolateral margins of dorsal idiosoma with one pair of gland pores (gdS4); clunal setae J5 minute; genitiventrianal shield longer than wide, length/ width ratio: 1.3 (1.26–1.33), spermathecal tubes hyaline, hook-like, stout, relatively long, with well indicated and observable ductus; soft dorsolateral and opisthogastric integument bearing 14 pairs of setae (r6, R1, R3–R8, JV3–JV5, ZV2–ZV4) and four pairs of poroids (ivo1, ivo2, ivo3, ivp); tarsus II with two spur-like distal setae (pl1, pl2).

Description. Female (n=4)

Dorsal idiosoma ( Fig. 1A ) — Dorsal shield 669 (616–715) long, 403 (385–420) wide, length/width ratio: 1.7 (1.6–1.7), oval-shaped, ornamented with reticular pattern; with twelve pairs of poroids (idj4, idj6, idJ1, idJ2, idJ4, ids4, idS3, idS4, idS5, idz6, idZ2, idZ3); a pair of gland pores (gdS4) present on posterolateral margins, gdZ1 subcircular and well separated from gdS4; shield bearing 30 pairs of setae, smooth and needle-like, clunal setae J5 minute, other setae long. Lengths of dorsal setae: j1 25 (24–26), j2 67 (62–72), j3 79 (78–80), j4 72 (72–74), j5 51 (48–54), j6 84 (78–88), J1 91 (90–94), J2 88 (82–93), J3 86 (78–96), J4 83 (80–90), J5 9 (8–10), z1 52 (48–55), z2 88 (86–90), z4 102 (100–106), z5 65 (62–68), z6 94 (90–96), Z1 93 (88–98), Z2 98 (96–100), Z3 99 (94–104), s2 80 (76–84), s4 95 (88–100), s5 95 (88–100), s6 65 (60–68), S1 51 (50–54), S3 25 (24–28), S4 90 (86–93), S5 89 (84–93).

Ventral idiosoma ( Fig. 1B ) — Sternal shield 217 (208–228) long, 116 (96–135) wide, reticulate and bearing four pairs of setae st1-4 and three pairs of poroids (iv1, iv2, iv4); shield posterior margin concave, reaching level of posterior margin of coxae IV. Length of setae: st1 77 (68–83), st2 73 (68–80), st3 61 (52–67) and st4 71 (68–73). Genitiventrianal shield 327 (304–348) long, 253 (240–260) wide, longer than wide, length/ width ratio: 1.3 (1.26–1.33), abutting sternal shield anteromesally, suboval, reticulate throughout and bearing genital setae st5 70 (68–72), with two pairs of opisthogastric setae JV1 71 (68–76), JV2 70 (64–80), one pair of pore (iv5) and three short circumanal setae. Metapodal plates small and oval. Dorsolateral and opisthogastric soft integument with eight pairs of marginal [r6 47 (46–48), R1 15 (14–16), R3 42 (40–44), R4 43 (42–44), R5 75 (74–76), R6 71 (64–80), R7 75 (74–76), R8 75 (74–76)] and six pairs of opisthogastric setae [JV3 68 (66–70), JV4 58 (56–60), JV5 87 (86–88), ZV2 70 (68–72), ZV3 88 (86–90), ZV4 77 (76–78)], respectively. Opisthogastric integument bearing four pairs of poroids (ivo1, ivo2, ivo3, ivp).

Gnathosoma — Hypostomal seta h3 31 (28–34) and h1 30 (28–33) over twice longer than h2 13 (12–15) and palpcoxal setae pc 11 (10–14); corniculi elongated 77 (76–80) and horn-like ( Fig. 2A ); six transverse rows of denticles, followed posteriorly by a smooth ridge. Palptarsus with 3-tined apotele ( Fig. 2B ). Epistome with finely denticulate anterolateral margins, median process neck-like, concave laterally, with apical serration of elongate denticles ( Fig. 2C ). Movable digit of chelicera 62 (60–64), with large subterminal tooth and distal hook; fixed digit 47 (45–49) with two subterminal teeth and tridentate distal hook; pilus dentilis not seen ( Fig. 3A ).

Spermathecal apparatus ( Fig. 3B ) — Sperm access system associated with coxae IV. Tubes of sperm induction system hyaline, well-developed, stout and slightly curved (somehow comma-shaped) with thin ductus inside.

Legs ( Fig. 3C ) — Legs normal, shorter than idiosoma. Tarsus I-IV with ambulacrum and two claws. Female tarsus II with two spur-like distal setae (pl1, pl2). Leg lengths (including pretarsi): I 496 (464-520); II 450 (400-544); III 366 (336-408); IV 502 (472-544). Leg IV is the longest and leg III is the shortest one. Legs IV and I longer than legs II and III. Leg chaetotaxy normal for the genus. Leg I: coxa 1-1/0-1/1-0; trochanter 1-1/2-0/1-1; femur 2-2/3-3/1-2; genu 2-3/3-1/2-2; tibia 2-3/2-1/2-2; leg II: coxa 0-0/0-0/1-0; trochanter 1-2/1-0/0-1; femur

μm for B.

2-2/3-1/2-1; genu 2-3/2-2/0-2; tibia 2-3/1-0/2-2, tarsus 3-3/4-3/2-3; leg III: coxa 0-0/0-0/0-0; trochanter 1-2/1-0/0-1; femur 1-2/1-0/1-1; genu 1-2/2-0/1-1; tibia 1-2/1-1/1-1, tarsus 3-4/3-2/3- 3; leg IV: coxa 0-0/0-0/0-0; trochanter 1-1/0-0/2-1; femur 1-2/1-0/1-1; genu 1-2/2-0/1-1; tibia 1-1/2-1/1-1, tarsus 3-3/4-3/2-3.

Male. Not found.

Figures

Figure 1 Olopachys iraniensis n. sp. (female): A – Dorsal idiosoma; B – Ventral idiosoma. Scale bar: 100 μm.

Figure 2 Olopachys iraniensis n. sp. (female): A – Ventral gnathosoma; B – Palp tarsus; C – Epistome. Scale bar: 100 μm for A and C; 50

Figure 3 Olopachys iraniensis n. sp. (female): A – Chelicera; B – sperm access system; C – tarsus II. Scale bar: 100 μm.

Figure 4 Tubes of the sperm access systems: A – Olopachysc ompositus; B – Olopachys caucasicus; C – Olopachys iraniensis n. sp. Scale bar: 50 μm.