Oligodentatus tridentatus Shcherbak & Bregetova, 1980

Mohammadi, Leila & Hajizadeh, Jalil, 2024, Review of the family Digamasellidae (Acari: Mesostigmata) in Iran with three new records and a key to species, Persian Journal of Acarology 13 (3), pp. 375-393 : 382-384

Oligodentatus tridentatus Shcherbak & Bregetova, 1980

Oligodentatus tridentatus Shcherbak and Bregetova , in Shcherbak (1980): 174.

Dendrolaelaps (Oligodentatus) tridentatus — Hirschmann and Wiśniewski (1982): 18. Oligodentatus tridentatus — Castilho (2012): 220.

Adult female (n= 5)

Gnathosoma – Epistome with three prongs of similar length; palp apotele two-tined; fixed cheliceral digit 25 (24–27) long, with 5–6teeth and a setiform pilus dentilis; movable cheliceral digit 32 (32) long, with three teeth; corniculi horn-like; hypostomal setae smooth, h1 20 (16–23), h2 11 (10–12), h3 20 (14–22), pc 19 (17–21).

Idiosoma – 342 (332–348) long, 206 (180–232) wide.

Dorsal idiosoma ( Fig. 10 ) – Dorsal shield reticulate, podonotal and opisthonotal shields separate. Podonotal shield with 22 pair of setae (j1 –6, z1 –6, s1 –6, r2 –5), five pair of distinguishable lyrifissures (id1, id2, id4, id5 and id6), a pair of glands (gd2) and four scleronoduli between setae j5 and j6. Opisthonotal shield with 17 pair setae (J1 –5, Z1 –5, S1 –5, R4 –5 ), nine pairs of distinguishable lyrifissures (idm1, idm2, idm3, idm4, idm5, idm6, idl1, idl3 and idl4) and a pair glands (gd8). Measurements of setae: j1 13 (12–14), j2 19 (16–20), j3 19 (18–20), j4 19 (18–20), j5 18 (16–20), j6 19 (16–20), z1 11 (11), z2 19 (18–20), z3 19 (18–20), z4 21 (20–22), z5 19 (18–20), z6 22 (20–23), s1 18 (16–20), s2 18 (18), s3 20 (18–22), s4 21 (20–22), s5 24 (22–26), s6 23 (20–26), r2 18 (18), r3 18 (16–20), r4 17 (14–20), r5 17 (14–18), J1 20 (20), J2 21 (18–24), J3 21 (17–23), J4 22 (21–24), J5 14 (14), Z1 25 (24–27), Z2 26 (22–28), Z3 25 (24–26), Z4 20 (20), Z5 45 (44–50), S1 22 (20–24), S2 18, S3 20 (18–22), S4 25 (23–26), S5 52 (50–56); R1 14 (12–15), R2 16 (14–18), R3 16 (16), R4 20 (18–20), R5 24 (22–25). All setae smooth .

Ventral idiosoma ( Fig. 11 ) – Tritosternum base 24 (22–27), with paired divided laciniae. Ventral shields smooth. Sternal shield 90 (84–94) long and 70 (64–80) wide, with four pairs of setae, st1 18 (18), st2 18 (17–19), st3 17 (16–18), st4 16 (16) and three lyrifissures (iv1, iv2, iv3). Genital shield 64 (60–70) wide, with a pair of setae st5 17 (16–18), iv5 located on soft cuticle. Ventrianal shield rectangular, length 128 (126–132) and width 77 (74–78); with five pairs of preanal setae, Jv1 13 (12–16), Jv2 16 (14–16), Jv3 15 (14–17), Zv2 14 (12–16), Zv3 19 (16–21) 8in addition to para - anal 24 (22–25) and post-anal 21 (20–22). Setae Zv1 14 (12–18), Jv4 26 (24–28), three lyrifissures (ivo) and a pair of partially fused metapodal plates on the soft cuticle of each side. Peritremes short, extending anteriorly to level of posterior part of coxae II.

Legs ( Figs. 12–15 ) – Lengths, excluding pretarsi: leg I 264 (260–268), leg II 194 (188–204), leg III 182 (172–188), leg IV 229 (220–236). Chaetotaxy: Leg I: coxa 0-0/2, 0/0-0 (2), trochanter 1-1/1, 1/1-1 (6), femur 2-3/3, 2/3-0 (13), genu 2-3/2, 2/2-1 (12), tibia 2-3/2, 2/1-2 (12), Leg II: coxa 0-0/1, 0/1-0 (2), trochanter 0-0/2, 1/2-0 (5), femur 0-3/2, 2/3-1 (11), genu 1-5/1, 2/2-0 (11), tibia 1-3/2, 2/2- 0 (10), Leg III: coxa 0-0/1, 0/1-0 (2), trochanter 1-1/1, 0/2-0 (5), femur 1-2/1, 1/0-1 (6), genu 1-3/1, 2/1-1 (9), tibia 1-2/1, 2/1-1 (8), Leg VI: coxa 0-0/1, 0/0-0 (1), trochanter 1-1/2, 0/1-0 (5), femur 0- 3/2, 1/0-1 (7), genu 1-2/1, 2/0-1 (7), tibia 1-1/1, 2/1-1 (7).

Spermatheca – In the form of a narrow tube that opening in coxa III.

Material examined – Five females and one deutonymph, from manure, Chaboksar County (36° 55' 35.0" N, 50° 37' 58.6" E), 24 November 2009 .

Remarks – Comparing the examined specimens with Sherbak's (1980) description, idiosoma (342 vs. 310–330), movable cheliceral digit (32 vs. 37).

Note – Material examined for the genera Dendroseius and Dendrolaelaps in Guilan Province are given in Mohammadi and Hajizadeh (2022) and Mohammadi and Hajizadeh (2023) articles, respectively.

A list of Digamasellidae species recorded from Iran

The new findings reported in the previous pages raise to 31 the total number of digamasellid species so far known from Iran, as summarized in Table 1.

references.

Figures

Figures 10–11. Oligodentatus tridentatus Shcherbak & Bregetova (female) – 10. Dorsal idiosoma; 11. Ventral idiosoma.

Figures 12–15. Oligodentatus tridentatus Shcherbak & Bregetova (female) – 12. Coxa–tibia of leg I; 13. Coxa–tibia of leg II; 14. Coxa–tibia of leg III; 15. Coxa–tibia of leg IV.