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Download Article (PDF) Biologia 68/4: 712—719, 2013 Section Zoology DOI: 10.2478/s11756-013-0198-y New species and record of the genus Petalomium (Acari: Heterostigmatina: Neopygmephoridae) associated with ants (Hymenoptera: Formicoidea) from Iran Hamidreza Hajiqanbar1 & Alexandr Khaustov2 1Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, 14115-336, Tehran, Iran; e-mail: [email protected] 2Nikita Botanical Gardens – National Scientific Center, Yalta, Crimea, 98648,Ukraine Abstract: The mite Petalomium camponoti Hajiqanbar & Khaustov sp. n. (Acari: Prostigmata: Neopygmephoridae) is described based on females recovered from ants Camponotus buddhae Forel (Hymenoptera: Formicidae) which were collected from a nest located on heights near Shirvan city, northeastern Iran. We also found Petalomium gottrauxi Mahunka, 1977 associated with Camponotus aethiops Latreille from the same locality. These findings present the first record of the genus Petalomium Cross from Iran. A key to species of the genus Petalomium associated with ant genus Camponotus Mayr is presented and host range of the Petalomium is discussed. Key words: mite; ant; phoretic; Camponotus;Formicidae Introduction tus Mayr, 1981 ants is provided and host range of the genus Petalomium is discussed. The nests of ants (Hymenoptera: Formicoidea) provide a suitable habitat for wide range of arthropods includ- ing mites (Arachnida: Acari). Generally, the suborder Material and methods Prostigmata (Acari: Trombidiformes) contains one of Mites were recovered from an ant colony. Insect individu- the largest assemblages of mites associated with ants als were collected directly from their nest by tweezers and and their nests. Among prostigmatic mites, closely re- placed into a vial containing 75% ethanol. The mites were lated fungivorous heterostigmatic families Microdispi- cleared in lactophenol and mounted in Hoyer’s medium. dae, Scutacaridae, and Neopygmephoridae encompass a The morphology of the mite specimens was studied with very much array of myrmecophilous genera and species. an Olympus BX51 phase contrast microscope. All measure- µ Although is it known that neopygmephorid genera ments in this description are given in m for the holotype and five paratypes (in parentheses). The terminology and Acinogaster Cross, 1965 and Petalomium Cross, 1965 setal notation follow that of Lindquist (1986). are inhabitants of ant nests and are associated with The holotype of new species is deposited in the Acaro- a wide range of ant species, only limited information logical Collection, Department of Entomology, Faculty of is available about their biology and interactions with Agriculture, Tarbiat Modares University, Tehran, Iran. One their ant hosts (Eickwort 1990). Ebermann & Rack paratype deposited in the followings: Zoological Institute, (1982) reared Petalomium fimbrisetum Ebermann et University of Hamburg, Hamburg, Germany; Collection of Rack, 1982 on a fungal diet under laboratory condi- Nikita Botanical Gardens, Yalta, Crimea, Ukraine. The rest tions. of paratypes (10) as well as the material of Petalomium got- The genus Petalomium includes about 35 species trauxi are retained with the holotype. and is distributed in almost all zoogeographic realms of the world. Until now, neopygmephorid genera Bakerda- Systematics nia, Pseudopygmephorus, Allopygmephorus and Para- pygmephorus have been recorded from Iran but the Family Neopygmephoridae Cross, 1965 genus Petalomium has never been found in this coun- Genus Petalomium Cross, 1965 try (Kamali et al. 2001; Khaustov & Hajiqanbar 2004, 2006; Hajiqanbar et al. 2011). Here, we describe a Petalomium camponoti sp. n. (Figs 1–7) new species of Petalomium and report a previously described species from northeastern Iran. Moreover, a Diagnosis. The new species is easily distinguished key to Petalomium species associated with Campono- from all known species of the genus by the characteris- c 2013 Institute of Zoology, Slovak Academy of Sciences New species and record of the Petalomium from Iran 713 Fig. 1. Petalomium camponoti sp. n., female. Dorsal aspect of body. Scale 100 µm. tically modified, spine-like setae 4b. In remaining con- longer than and anterior to ch2; dorsomedian apodeme geners, setae 4b are seta-like. evident and diffuse in distal half; subcapitulum with one pair of pointed and smooth subcapitular setae su Description. Phoretic female: length of idiosoma 247 10 (10–12); pharyngeal pump system (Fig. 3) including (229–265), width 169 (141–187). three pumps, pumps 1 and 2 striated, pumps 1 and 3 Gnathosoma (Figs 1–3). Length of gnathosoma small, but pump 2 well developed and subcylindrical; 26 (25–28), width 27 (26–28). Gnathosomal capsule palps appressed to gnathosomal capsule, dorsally bear- rounded subpentagonal in dorsal aspect, almost as wide ing two smooth and pointed setae dGe 10 (10–11) and as long; dorsally with two pairs of pointed and smooth dFe 7 (7–8), ventrally with one small solenidion and cheliceral setae ch1 16 (16–17) and ch2 12 (12–14), ch1 accessory setigenous structure (ass), palps terminated 714 H. Hajiqanbar &A.Khaustov Figs 2–3. Petalomium camponoti sp. n., female. 2 – Ventral aspect of body, 3 – pharyngeal pumps. Scales 100 µm (Fig. 2), 20 µm (Fig. 3). with a tibial claw; minute palpcoxal setae pp inserted gite D with arched posterior margin, bearing one pair near to articulation of each palp to the gnathosomal of setae d 68 (64–73) and one pair of cupuli ia situ- capsule. ated anterolaterally to setae d; tergite EF with almost Idiosomal dorsum (Fig. 1). All dorsal plates straight posterior margin, with two pairs of setae e 37 smooth; all dorsal idiosomal setae thick, distinctly (33–40) and f 85 (80–88), seta f more than twice (al- barbed and pointed except v2 which is smooth and most 2.3 times) longer than e andinsertedanteriorto needle-like; prodorsal shield (PrS) with two pairs of e; tergite H with a distinct protuberance in the mid- setae v2 8 (7–9), sc2 47 (46–50), one pair of capitate dle of posterior margin, bearing two pairs of setae h1 trichobothridia (sc1) and one pair of distinctly rounded 90 (80–101), h2 73 (65–81) and one pair of cupuli ih stigmata with well developed atria and tracheal sys- placed anterolaterally to base of setae h2,setah1 longer tems located at mid-level of the prodorsum; tergite C thanh2; distances between dorsal idiosomal setae: v2-v2 with distinctly arched anterior margin but posterior 50 (48–55), sc2-sc2 46 (43–51), c1-c1 66 (62–74), c2-c2 margin convex in middle part and concave in lateral 122 (119–141), c1-c2 28 (28–32), d-d 59 (57–73), e-e 85 parts, bearing two pairs of setae c1 68 (66–72) and c2 86 (75–101), f-f 68 (63–81), e-f 10 (8–14), h1-h1 25 (20–28), (82–89), c2 longer than and slightly posterior to c1;ter- h2-h2 48 (44–58), h1-h2 11 (12–15). New species and record of the Petalomium from Iran 715 Figs 4–5. Petalomium camponoti sp. n., female. 4 – Left leg I; 5 – Left leg II. Scales 20 µm. Idiosomal venter (Fig. 2). All presternal setae lar and acute, median genital sclerite (mgs) well devel- barbed and pointed, setae 1b thicker and shorter than oped; posterior margin of aggenital plate (Ag) curved other presternal setae; most poststernal setae smooth throughout; pseudanal plate with three pairs of setae and pointed except setae 4b which are characteristi- ps1 17 (14–19), ps2 13 (11–14), ps3 10 (9–10) and anal cally modified, distinctly spine-like; ventral apodemes slit, ps1 > ps2 > ps3, ps1 sparsely barbed. (ap1–4, appr, apsej, appo) well-developed, ap5 short, Legs (Figs 4–7), leg I (Fig. 4). Setal formula (num- secondary transverse apodeme (sta) visible; coxal fields ber of solenidia in parentheses): 1-3-4-16(4); thicker I–II and III–IV with two and three pairs of setae each, than other legs; terminated with one sickle-like claw respectively; coxal field I: 1a 47 (40–52), 1b 30 (26– opposed to modified unguinal setae u’-u”. Tibiotarsus: 30); coxal field II: 2a 47 (44–49), 2b 44 (41–46), se- with five blunt-ended eupathidial setae p”, tc’, tc”, ft’ tae 1a and 2a subequal and longest in anterior sternal and ft”; tc” located on a distinct pinnaculum; setae d, plate; coxal field III: 3a 42 (36–43), 3b 42 (40–50), 3c k, l’, l”, v’, v”, pv’ and pl’ barbed; the rest of setae of the 35 (31–37), setae 3a and 3b subequal and longer than segment smooth; solenidion ω1 12 (11–12) prominent, 3c;coxalfieldIV:4a 47 (42–51), 4b 40 (36–43), 4c 43 well-developed and finger shaped; solenidia ω2 8 (7–8) (40–47), setae 4a longer than 4b and 4c; posterior mar- and φ2 9 (9–11) homomorph, thin and finger shaped; gin of posterior sternal plate concave medially; anterior solenidion φ1 10 (9–10) clubbed. Genu: setae of the seg- and posterior genital sclerites (ags and pgs) subtriangu- ment barbed except v”;setael”, v’ and v” subequal and 716 H. Hajiqanbar &A.Khaustov Figs 6–7. Petalomium camponoti sp. n., female. 6 – Right leg III; 7 – Right leg IV. Scales 20 µm. shorter than l’. Femur: seta d hook-like; seta l’ modi- l’ and v” of the same length and longer than v’ and d; fied, dagger-like; setae v” and l’ subequal and smooth. solenidion φ 7 (6–7) finger shaped. Genu: seta l’ smooth, Trochanter: seta v’ smooth and subequal to femoral se- v’ barbed, both subequal. Femur: seta d thicker and tae v” and l’. longer than l’, both barbed. Trochanter: seta v’ barbed. Leg II (Fig. 5); setal formula: 1-3-3-4(1)-6(1); Tar- Leg IV (Fig. 7); setal formula: 1-2-1-4(1)-6; longer sus: seta pv’ smooth; the rest of the setae of the seg- and thinner than other legs; Tarsus: seta tc” smooth; ment barbed; solenidion ω 12 (11–13) prominent, finger the rest of the setae of the segment distinctly barbed; se- shaped, located at the base of the segment.
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