Tyrophagus hamedaniensis, Khanjani & Saboori, 2019

Khanjani, Farshad Masoudian Mohammad & Saboori, Alireza, 2019, Tyrophagus hamedaniensis sp. nov. (Acari: Acaridae) from Western Iran, Persian Journal of Acarology 8 (1), pp. 1-9 : 2-7

Tyrophagus hamedaniensis sp. nov.

http://zoobank.org/ urn:lsid:zoobank.org:act:9BAF81E3-8166-4E44-91BD-5DA51AC34343

Diagnosis

Prodorsal shield with un-sharp eye spots, dorsal seta d1 considerably longer than seta c1, d1 / c1 3.0–3.50 times; tarsus I with short, stout and clavate apically solenidion ωΙ; w and r of tarsus IV setiform; spermathecal duct long 48 (45–48) and with an annulated (taenidium like) lining in distal half from base of spermathecal sac, base of spermathecal sac flat and normal 12 (12–13 µm) in width; Ratio: d1 / c1 3.0–3.50; d1 / d2 2.72–2.76; d2 / c1 1.1–127.

Description

Female ( Figs. 1 –19; n = 4) – Idiosoma oval. Length of body including gnathosoma 618 (538– 593), excluding gnathosoma 550 (470–525); width 333 (255–290).

Dorsum ( Figs. 1–3 , 12, 14) – Prodorsal shield punctate, with two pairs of setae (vi and ve), 83 (75–79) long, 80 (75) wide between setae ve -ve, almost pentagonal in shape with lateral margins slightly concave ( Figs. 3 , 12). Eye spots present ( Figs. 1, 3 , 12); Basal lobe of Grandjean's organ with one large tooth and two small teeth, 13 (12–15), 7 (6) and 3 long, respectively ( Fig. 2 ). Supracoxal seta scx pectinated with 4–6 branches on each side and broadly expanding at the base but gradually tapers to a fine point distally ( Figs. 1, 3 , 14). All dorsal setae finely serrated. All opisthosomal setae whip-like except c1, d1 and d2. Opisthosoma with three pairs of lyrifissures (ia, im and ip) and one pair of opisthosomal gland (gla) at level of seta e1; setae c1 and d2 are the shortest whereas setae f2 and h1-2 are the longest dorsal setae. Length of dorsal setae: vi 78 (73–77), ve 38 (38–40), sci 155 (150–153), sce 90 (75–85), scx 30 (30–33), c1 30, c2 155 (165–168), cp 145 (150–160), d1 98 (90– 105), d2 38 (33–38), e1 255 (260–280), e2 188 (200–214), f2 270 (285–290), h1 273 (288), h2 265 (285). Distances: vi -vi 10 (10–13), vi -ve 35 (30–33), ve -ve 80 (75), sce -sce 88 (83–87), sci -sce 25, sci -sci 38 (30–33), sce -ve 60 (60–80), c1-c1 113 (90), c1-c2 58 (49–55), c2-c2 225 (190–200), c2-cp 38 (35–38), cp -cp 300 (245–265), c1-d1 75 (63–65), d1-d1 45 (35–40), d1-d2 115 (90–100), d2-d2 238 (190–210), d2-gla 68 (55–65), gla -gla 263 (220–245), gla -e1 78 (58–68), e1-e1 125 (95–113), e1-e2 125 (100–113), e2-e2 263 (205–260), f2-f2 188 (165–200), e1-h1 147 (125–135), h1-h1 78 (68–75), h1-h2 38 (33–35), h2-h2 60 (63–68). Ratio: d1 / c1 3.37 (3.0–3.50), d1 / d2 2.58 (2.72–2.76), d2 / c1 1.27 (1.1–1.27).

Gnathosoma ( Figs. 4–5 ) – Punctate; palpi two-segmented, palp tarsus with a simple seta (pt) and one solenidion (ω) 13 and 6 (6–7) long, respectively; palp tibia with two simple setae [d 25 (25– 27) and l 20 (17) long]; infracapitulum with one simple seta (m) 28 (30–33) long, rutellum distinct and developed ( Fig. 5 ); chelicerae 78 (75) long, cheliceral seta cha spine-like 5 (6) long, movable and fixed digits with 4–5 teeth ( Fig. 4 ). Palp coxa with one elcp setae 10 (12–13) (Fig. 16). Distance: m - m 23 (25).

Venter ( Figs. 6–7 , 13, 15–14) – Coxal plates I well developed and divided with apodemes anteriorly on each side with four nodules, coxal plates I extending postero-medially beyond apex of prosternal apodeme forming two lobes ( Figs. 6 , 13, 15); coxal plates II broadly triangular and developed beyond apex of well-developed apodeme; between coxae II and III is a pair of thin sclerotized sejugal apodemes, 60 long; coxal plates III-IV each with apodemes ( Fig. 6 ); genital region (posterior to sejugal apodemes to coxae IV) with two pairs of genital papillae 17 (18) long and 13 wide, a pair of setae (g) and genital folds ( Fig. 6 ). Anal region with three pairs of adanal setae (ad1- 3) and three pairs of pseudoanal setae (ps1-3), seta ps1 the longest anal setae ( Fig. 6 ); a pair of lyrifissures (ih) between the base of setae ad2 and ps2. Copulatory opening 6 (5–6) in diameter, spermathecal duct narrowing gradually from copulatory, spermathecal duct 48 (45–48) long, the thin part of the duct 18 (17–19) in length and 1 in width, the thick part of duct 2 (2–2.5) in width, the distal half part of spermathecal duct from base of spermathecal sac with an annulated (taenidium like) lining, 10 (8–10) in length, base of spermathecal sac flat 12 (12–13) in width, sclerites of oviducts Y shape and 8 (8–9) in apart ( Fig. 7 , 16); Length of ventral setae: 1a 28 (30–35), c3 30 (30–33), 3a 15 (17–20), 3b 45 (43–45), 4a 65 (55–60), g 15 (15–18), ad3 13 (12–13), ad2 18 (16), ad1 13 (13–14), ps3 15, ps2 110 (95–100), ps1 170 (175), h3 195 (175–205).

Figures 12-19. Tyrophagus hamedaniensis sp. nov. (female) – 12. Prodorsal shield; 13. Ventral view of propodosoma region; 14. Supracoxal seta scx; 15. Coxal plates and apodemes I; 16. Spermatheca; 17. Solenidion ωΙ on tarsus I; 18. Solenidion ω on tarsus II; 19. Seta r on tarsus IV.

Legs ( Figs. 8–11 , 17–19) – Setal formulae of leg segments I-IV as follows (solenidia and special setae in parentheses): coxae 1-0-2-1; trochanters 1-1-1-0; femora 1-1-0-1, genua 2(2σ)-2(1σ)-1(1σ)- 0; tibiae 2(1φ)-2(1φ)-1(1φ)-1(1φ); tarsi 13(3ω,18)-12(1ω)-10-10. Leg I-II with solenidion cylindrical and apex obviously widened (ωΙand ω, respectively) ( Figs. 8–9 , 17–18). Measurements of leg segments and setae as follows: Leg I: Tr 38 (33–38), pR 33 (25–30), Fe 43 (43–50), vF 48 (38–45), Ge 30 (33–35), cG 28 (28–30), mG 43 (37–42), 01 45 (37–43), 02 25 (20–25), Ti 25 (25–27), gT 25, hT 30 (25–30), ϕ110 (110–113), Ta (L.) 53 (50–53), Ta (W.) 20 (20–23), ωΙ 17 (18), ω²8, ω325 (25–30), 84, aa 20 (18), ba 24 (18–20), wa 43 (33–38), ra 25 (23–25), la 23 (20–23), d 30 (35), e 8, f 18, p 4 (4–5), q 4 (4–5), s 8, u 5, v 5, empodium 17 (13–15), claw 15 (13–14); Leg II: Tr 38 (30– 33), pR 27 (25–33), Fe 45 (43–50), vF 55 (43–50), Ge 33 (33–35), cG 28, mG 38, 018 (18–23), Ti 25 (28), gT 25, hT 33 (30–33), ϕ110 (100–115), Ta (L) 48 (50), Ta (W) 18 (18–20), ω20, ba 15 (15– 18), wa 39 (35–38), ra 29 (28–33), la 20 (18), d 30 (28–33), e 7 (8), f 13 (15), p 5, q 5, s 6 (6–7), u 7 (6), v 7 (6), empodium 13 (13–15), claw 13; Leg III: Tr 30 (38), sR 33 (33–38), Fe 35 (33–38), Ge 25 (30), nG 38 (43–45), 0 20 (18), Ti 25, kT 38 (38–43), ϕ115 (120–125), Ta (L) 55 (60), Ta (W) 13 (15), w 30 (27–33), r 25 (22–25), d 28 (25–28), e 7 (8), f 18 (15–19), p 4, q 4, s 6 (5–7), u 5 (6), v 5 (6), empodium 15 (13–15), claw 13 (10–13); Leg IV: Tr 38 (40), Fe 40 (42–45), wF 38 (40–43), Ge 33 (38), Ti 30 (35), kT 35 (35–38), ϕ110 (100–120), Ta (L) 55 (63–68), Ta (W) 15 (13–15), w 35 (28–35), r 20 (18–20), d 28 (25), e 8 (7–8), f 18 (16–18), p 4 (4–5), q 4 (4–5), s 7 (6–7), u 5, v 5, empodium 13 (12–13), claw 13 (12–13), Ge and Ti IV with minute preapical process ( Fig. 11 ), setae w and r of tarsus IV setiform (Fig. 18).

Remarks

The new species is similar to T. putrescentiae ( Schrank, 1781) (re-described from New Zealand by Fan and Zhang, 2007) in having dorsal seta d1 considerably longer than seta c1, 2.1–3.5 times, prodorsal shield with eye spots, tarsus I with short, stout and clavate apically solenidion ωΙ, setae w and r of tarsus IV setifom but it differs in: 1. Ratio setae d1 / c1 3.0-3.5 vs. 2.1-2.8; 2. Coxal plate II broad and convex and well developed beyond apex of apodeme in the former but normal and sinuous shaped and not extending beyond apex of apodeme in the latter; 3. Spermathecal duct without neck at its distal half in Iranian species opposed to present in New Zealand specimens; 4. Dorsal setae of new species are shorter than other species: vi 73–78, ve 38–40, sci 150–155, sce 75–90, c1 30, c2 155–168, e1 255–280, e2 188–214, f2 270–290, h1 273–288, h2 265–285, h3 175–205 vs. vi 98–117, ve 60–62, sci 185–210, sce 116–137, c1 50–51, c2 247–261, e1 319–333, e2 276–286, f2 337–391, h1 384–392, h2 370–373, h3 314–319.

The individuals of T. hamedaniensis sp. nov. are closely similar to T. womersleyi Fan and Zhang, 2007 (from New Zealand) in having dorsal setae c1 and d2 short and subequal in length, prodorsal shield with eye spots; tarsus I with short, stout and clavate apically solenidion ωΙ, base of spermathecal sac flat but it differs in: 1. The setae f2 and h1-2 is the longest dorsal setae in Iranian species vs. seta h 2 in Australian species; 2. The distal half of spermathecal duct without neck in Iranian species but it present in Australian species; 3. The distal half part of the spermathecal duct from the base of the spermathecal sac with an annulated (taenidium like) lining in the first species whereas smooth in the second species; 4. Ratio pseudoanal setae: ps1 / ps2: 1.5–1.8 vs. 2.7 and ps2 / ps3 6.3–7.3 vs. 5; 5. Ratio adanal setae ad2/ad1 1.14–1.38 vs. 0.83; 6. Tarsus II with short, stout and clavate apically solenidion ω, 20 long vs. stout, almost cylindrical, 16 long; 7. Seta r of tarsus IV setiform in the former opposed to spiniform in the latter; 8. Hysterosomal setae are shorter: e1 255– 280, e2 188–214, f2 270–290, h1 273–288, h2 265–285 and h3 175–205 vs. e1 303, e2 231, f2 318, h1 310, h2 338 and h3 309.

Etymology This species is named after the region of origin, Hamedan province, Iran.

Material examined

The specimens were collected from soil and litter beneath forest trees (blackthorn trees, Prunus spinose L. ( Rosaceae ), Nahavand region (34 ° 08′ 48″ N, 48 ° 13′ 26″ E), 01.05.2015, Hamedan

province, Iran, by F. Masoudian. All specimens (holotype and three paratypes) are deposited in the Collection of the Acarology Laboratory, University of Bu-Ali Sina , Hamedan, Iran .

Figures

Figures 1-7. Tyrophagus hamedaniensis sp. nov. (female) – 1. Dorsal view of idiosoma; 2. Grandjean's organ; 3. Prodorsal shield; 4. Chelicera; 5. Gnathosoma; 6. Ventral view of idiosoma; 7. Anal region.

Figures 8-11. Tyrophagus hamedaniensis sp. nov. (female) – 8. Leg I; 9. Leg II; 10. Leg III; 11. Leg IV.