Atractothrombium joharchii, Hakimitabar & Saboori, 2024

Hakimitabar, Masoud & Saboori, Alireza, 2024, Notes on Atractothrombium and Fissitrombium (Acari: Trombidiformes: Microtrombidiidae) with description of a new species of Atractothrombium from Iran, Persian Journal of Acarology 13, pp. 409-425 : 414-419

publication ID	https://doi.org/ 10.22073/pja.v13i3.85383
publication LSID	urn:lsid:zoobank.org:pub:460D84D4-8F2C-4353-B0C5-075E1FDC4F6B
persistent identifier	https://treatment.plazi.org/id/1EC3A479-9D7E-47A7-AB54-96F5A77C1E67
taxon LSID	lsid:zoobank.org:act:1EC3A479-9D7E-47A7-AB54-96F5A77C1E67
treatment provided by	Felipe
scientific name	Atractothrombium joharchii
status	sp. nov.

Treatment

Atractothrombium joharchii sp. nov. ( Figs. 1–10 View Figure 1 View Figure 2 View Figures 3–4 View Figures 5–8 View Figures 9–10 )

http://zoobank.org/ urn:lsid:zoobank.org:act:1EC3A479-9D7E-47A7-AB54-96F5A77C1E67

Diagnosis SD 168–178, W 154–166, h 2 / h 1 setae (1.22–1.29), length of solenidia on Ge I–III less than 50,

hypostomal setae (bs) with 7–8 finger-like protrusions distally, AL and PL setae barbed, solenidia on Ge I–III less than 50 and Cx formula: NB–B–B.

Description (n = 4)

Dorsum – Dorsal surface of idiosoma with a scutum, a scutellum and 26 (+2) barbed setae, each arising from a smooth sclerite except c 1 setae. There is a cuticular line at the base of each seta; setae c 2 and d 1 with larger sclerite than other hysterosomal setae, c 2 plates slightly enlarged and oval, d 1 plates larger than c 2 plates and oval ( Fig. 1 View Figure 1 ). Dorsal idiosomal setal formula: c 1– 3, d 1– 3, e 1– 3, f 1– 3, h 1–2 (6-6- 6-6-4). Scutum rounded anteriorly and completely deflexed; lateral borders convex near AL bases and concave between AL and PL; and slightly convex at the posterior border; anterolateral angles rounded, bent ventrally (stolascutum-type) ( Figs. 1 View Figure 1 , 2 View Figure 2 ); scutum punctate and conspicuously with longitudinal striae ( Fig. 2 View Figure 2 ); bearing three pairs of setae (AM, AL and PL) and one pair of trichobothria (S). AM (30–39) filiform and nude, AL (25–33) and PL (50–55), both slightly thicker than AM and barbed. S filiform and smooth. Boat-shaped scutellum posterior to scutum and wider than long, with striation and punctation ( Fig. 2 View Figure 2 ) and two barbed setae on posterior half, with straight anterior and lateral borders, posterior one convex. Ocular sclerites striated, 27 long and 10 wide, situated in the concavity of lateral borders of scutum; with two lenses, anterior 7, and posterior 4 in diameter ( Figs. 1 View Figure 1 , 2 View Figure 2 ).

Venter – Ventral surface of idiosoma with one pair of nude intercoxal setae (3a), 2 pairs of ventral setae located on smooth sclerites and an anus. All setae on ventral idiosoma with distinct barbs. Coxa I with nude proximal seta 1a; antero-median setulose seta 1b. Coxa II and III with setulose setae 2b and 3b respectively ( Fig. 3 View Figures 3–4 ). Claparède's organs between coxae I and II, oval, distinctly elevated, 12 in diameter. NDV = 26 (+ 2) + 4 = 30 (+2).

Gnathosoma – Gnathosoma with a pair of adoral setae (cs) nude. One pair of hypostomal setae (bs) short and thick, with 8 blunt digitations distally. Cheliceral base 82–92 long; cheliceral blade 25–27 long, curved with two minute subterminal teeth. Sclerotized oral ring (stephanostome) not closed dorsally, with large denticled membranes (more than 30 teeth) outside it, and small denticles inside it. Palpal femur and genu each with 1 small spine-like seta. Tibia with 3 nude setae of which 1 long and 1 shorter and the other one spine-like ( Fig. 4 View Figures 3–4 ); palpal tibial claw bifid. Palpal tarsus with 5 nude setae and a solenidion (8–9) and an eupathidium (18–19). fPp = 0-N-N-NNN 2 -5Nωζ.

Leg segmentation formula – 6–6–6. Leg setal formula: Leg I: Tr – 1n; Fe – 6n; Ge – 20, 1κ, 4n; Ti – 2φ, 1κ, 6n; Ta – 1ω, Ιε, 2ζ, 18n ( Figs. 5–6 View Figures 5–8 ). Leg II: Tr – 1n; Fe – 5n; Ge – Ι0, Ικ, 2n; Ti – 2φ, 5n; Ta – Ιω, Ιε, Ιζ, 14n ( Figs. 7–8 View Figures 5–8 ). Leg III: Tr – 1n; Fe – 4n; Ge – 10, 2n; Ti – 5n; Ta – 13n ( Figs. 9–10 View Figures 9–10 ). Tarsi I and II with two trifid falciform claws and a slender claw-like empodium; Ta III deformed with a modified inner claw (smilum), a trifid outer claw and a long and slender empodium; scopa with few setules, and lophotrix with 6 setules.

Measurements are given in Table 2.

Type material and deposition

The holotype (ARS‒20221025‒1a) and three paratype (ARS‒20221025‒1b to 1d) larvae were collected by M. Hakimitabar and O. Joharchi, 23 July 2009, near the Velayat river, Dizin region, Chalous road, Karaj city, Alborz province, Iran (36° 3.085' N, 51° 24.925' E, 2665 m a.s.l.), ectoparasitic on an undetermined Tachinidae ( Insecta: Dip.) (paratypes 1b and 1d) or off host (holotype and paratype 1c). The holotype and paratypes (ARS‒20220208‒1b to 1d) are deposited in the Acarological Collection, Jalal Afshar Zoological Museum, Faculty of Agriculture, University of Tehran, Karaj, Iran.

Etymology

The species is named in honor of Dr. Omid Joharchi (Johann-Friedrich-Blumenbach Institute of Zoology and Anthropology, Germany), a famous Iranian acarologist, for his great contribution to the taxonomy of Mesostigmata especially the family Laelapidae in Iran and other countries.

Remarks

There are 14 species of Atractothrombium , of which four species (see discussion) are based on larvae [L] or post-larval stages and larvae [P, L] as follows: A. sylvaticum (C.L. Koch, 1835) [P, L]) from Austria, France, Germany, Hungary, Ireland, Italy, Norway, Poland, Romania, Switzerland, The Netherlands, and Türkiye; A. tectocervix (Oudemans, 1903) [L] from Germany; A. amirkabiri Noei, Saboori & Hajizadeh, 2015 [L] from Iran and A. brevisetosum Karakurt & Sevsay, 2015 from Türkiye ( Southcott 1994; Gabryś et al. 2005; Mąkol and Wohltmann 2012; Adil and Sevsay 2014; Noei et al.

2015; Karakurt and Sevsay 2015). Atractothrombium joharchii sp. nov. differs from A. tectocervix in a stout conical seta at the end of Ta III (absent vs. present) (there is not enough information on this species for further comparisons); from A. sylvaticum in the normal setae on Ta I (18 vs. 17), Ta II (14 vs. 13), Ta III (13 vs. 12), shorter h 2 / h 1 setae (1.22–1.29 vs. ~ 2) and SD/W (1.01–1.12 vs. 1.56–1.90), from A. amirkabiri in the longer SD (168–178 vs. 126–141), W (154–166 vs. 121–131), AL (25–30 vs. 12–20), shorter solenidia on Ge I–III (less than 50 vs. more than 100) and seta 1a (nude vs. barbed), and differs from A. brevisetosum in the normal setae on Ta II (14 vs. 13), Ta III (13 vs. 11) and shorter SD/W (1.01–1.12 vs.1.67–1.91), longer h 2 (76–84 vs. 31–39) and h 1 (62–65 vs. 30–37), DS Max (62– 69 vs. 33–40), 1a (28–34 vs. 16–22), AM/AL (1.06–1.48 vs. more than 2 times) and AL setae (barbed vs. nude).