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Acari, Oribatida) Research Article ISSN 2336-9744 (online) | ISSN 2337-0173 (print) The journal is available on line at www.ecol-mne.com Additions to the Tasmanian oribatid mites, with supplementary description of Edwardzetes elongatus Wallwork, 1966 (Acari, Oribatida) SERGEY G. ERMILOV1, ANDREY A. YURTAEV1 and VLADIMIR PEŠIĆ2 1Tyumen State University, Semakova str., 10, 625003 Tyumen, Russia. E-mail: [email protected] 2Department of Biology, Faculty of Sciences, University of Montenegro, Cetinjski put b.b., 81000 Podgorica, Montenegro. E-mail: [email protected] Received 28 February 2015 │ Accepted 2 March 2015 │ Published online 3 March 2015. Abstract This study is based on material collected in 2007 from water environments of Tasmania; eight species of oribatid mites belonging to eight genera and seven families were registered. Edwardzetes elongatus Wallwork is recorded for the first time in the Australian region, which is redescribed and illustrated in detail on the basis of Tasmanian material. The morphological differences between populations of E. elongatus from Tasmania and South Georgia Island are noted. Key words: oribatid mites, fauna, new record, Edwardzetes elongatus, redescription, Tasmania. Introduction Knowledge of the Tasmanian oribatid mite fauna (Acari, Oribatida) is scant and is based on relatively few taxonomic works (for example: Banks 1916; Mahunka 1989; Olszanowski 1991; Niedbała & Colloff 1997; Hunt 1996a–d; Niedbała 2006; Łochyńska 2008a, b; Colloff 2009, 2011a, b). The primary goal of this paper is to present a list and new records of the identified taxa. In the course of taxonomic study, we found Edwardzetes elongatus Wallwork, 1966 (Ceratozetidae). The original description (Wallwork 1966) of this species, based on specimens from South Georgia Island, was short and incomplete (lacking information about the lengths of morphological structures, leg setation and solenidia, gnathosoma; also only two illustrations of dorsal and ventral view of body were available). The secondary goal of this paper is to redescribe and illustrate E. elongatus based on new materials from Tasmania. Material and Methods Our study is based on materials collected in September-November 2007 by Tom and Ivana Karanović (Hobart, Tasmania) from water environments with use of hand netting, and sorted in the laboratory under a stereo microscope. Some samples examined in the present study were collected using the Karaman-Chappuis method by digging a hollow into the sediment down to the groundwater level, allowing water to fill the bottom of the pit, and then collecting the water with a dish and filtering it through a plankton net (see Pešić et al. 2012). Ecol. Mont., 2 (2), 2015, 98-108 ERMILOV ET AL. Collection localities: — A: Rinqarooma River, interstitial habitat (Karaman-Chappuis dig), 13.09.2007. — B: Derwant River, New Norfolk, Bridgewater, 11.09.2007. — C: Ouse town, Ouse River, 09.09.2007. — D: Gunns Plains Cave, puddles etc., 20.09.2007. — E: Maydena town, interstitial, near Junee Cave, 23.09.2007. — F: Creek on Highland Lakes Road, 10.09.2007. — G: North Esk River, 14.09.2007. — H: Lake Pedder, Tpds Brach, 24.09.2007. — I: Mystery Crece Cave, 06.10.2007. Antarctic specimens of E. elongatus, identified by J. Starý, were compared to the Tasmanian material; they were collected from: South Georgia Island, Stromness Bay, Husvik, Tonsberg, west facing, moss Brachythecium austro-salebrosum in wet flush in middle valley, 100 m a.s.l., 20.01.1996, collected by R.J. Arnold. Specimens were mounted in lactic acid on temporary cavity slides for measurement and illustration. The body length was measured in lateral view, from the tip of the rostrum to the posterior edge of the ventral plate. Notogastral width refers to the maximum width in dorsal aspect. Lengths of body setae were measured in lateral aspect. All body measurements are presented in micrometers. Formulas for leg setation are given in parentheses according to the sequence trochanter–femur–genu–tibia–tarsus (famulus included). Formulas for leg solenidia are given in square brackets according to the sequence genu–tibia–tarsus. General terminology used in this paper follows that of Grandjean (summarized by Norton & Behan-Pelletier 2009). Drawings were made with a drawing tube using a Carl Zeiss transmission light microscope “Axioskop-2 Plus”. Images were obtained with an AxioCam ICc3 camera using a Carl Zeiss transmission light microscope “Axio Lab.A1”. Table 1. Tasmanian oribatid mite taxa. Localities, number of specimens Taxa Distribution A B C D E F G H I Malaconothridae Malaconothrus sp. 0 0 1 0 0 0 0 0 0 Tyrphonothrus sp. 0 0 0 0 0 0 0 1 0 Trhypochthoniidae Mucronothrus nasalis (Willmann, 0 1 0 0 0 1 0 0 0 Semicosmopolitan 1929) Tectocepheidae Tectocepheus sp. 0 0 0 0 0 0 0 1 0 Ceratozetidae Edwardzetes elongatus Wallwork, Antarctic, Chile, 0 0 0 0 0 0 0 3 0 1966 Tasmania Neotrichozetidae Neotrichozetes spinulosus Australian region, 0 0 0 0 0 0 0 1 0 (Michael, 1908) Argentina Oribatulidae Zygoribatula connexa Berlese, Australian, Palaearctic 0 0 0 0 0 0 1 0 0 1904 and Neotropical regions Haplozetidae Maculobates endroedyyoungai 0 0 0 0 0 0 0 2 0 Tasmania Mahunka, 1989 Juvenile instars* 1 6 1 1 1 2 0 3 1 *Mostly Malaconothridae and Trhypochthoniidae. Ecol. Mont., 2 (2), 2015, 98-108 99 ORIBATID MITES FROM TASMANIA Figure 1. Edwardzetes elongatus Wallwork, 1966, adult: dorsal view. Scale bar 200 μm. 100 ERMILOV ET AL. Figure 2. Edwardzetes elongatus Wallwork, 1966, adult: ventral view (legs not illustrated). Scale bar 200 μm. Ecol. Mont., 2 (2), 2015, 98-108 101 ORIBATID MITES FROM TASMANIA Figures 3–6. Edwardzetes elongatus Wallwork, 1966, adult: 3 — lateral view of anterior part of body (legs not illustrated); 4 — subcapitulum, right half, ventral view; 5 — palptarsus; 6 — chelicera, paraxial view. Scale bars 200 μm (3), 50 μm (4, 6), 20 μm (5). 102 ERMILOV ET AL. Figures 7–10. Edwardzetes elongatus Wallwork, 1966, adult: 7 — leg I (without trochanter), left, antiaxial view; 8 — femur, genu and tibia of leg II, right, antiaxial view; 9 — trochanter, femur and genu of leg III, right, antiaxial view; 10 — leg IV, right, antiaxial view. Scale bar 100 μm. Fauna The oribatid mite taxa identified by us from Tasmania, their localities and notes on new records and overall known distributions1 are presented in Table 1. We registered totally 8 species belonging to 8 genera and 7 families. Three species, Mucronothrus nasalis (Willmann, 1929), Zygoribatula connexa Berlese, 1904 and E. elongatus, are recorded for the first time in Tasmania; E. elongatus are recorded for the first time in the Australian region. 1See mostly Subías (2004, updated 2014). Ecol. Mont., 2 (2), 2015, 98-108 103 ORIBATID MITES FROM TASMANIA Supplementary description Edwardzetes elongatus Wallwork, 1966 (Figures 1–23) Figures 11–18. Edwardzetes elongatus Wallwork, 1966, adult, microscope images: 11 — rostral seta; 12 — bothridial seta; 13 — medio-distal part of interlamellar seta; 14 — genal tooth; 15 — medio-distal part of tutorium; 16 — notogastral seta p1; 17 — genu and anterior part of femur of leg I, left, antiaxial view; 18 — genu and anterior part of femur of leg II, left, antiaxial view. Scale bar 20 μm. 104 ERMILOV ET AL. Figures 19–22. Edwardzetes elongatus Wallwork, 1966, adult, microscope images: 19 — custodium and discidium; 20 — genital plates; 21 — adanal lyrifissures, adanal seta ad3 and part of anal plate; 22 — claws of leg III. Scale bar 20 μm. Measurements. Body length: 830–1029 (three specimens: one female and two males); notogastral width (without pteromorphs): 398–498 (three specimens). Integument. Body color light brown to dark brown. Body surface smooth, but prodorsum indistinctly punctate. Prodorsum. Rostrum widely rounded. Lamellae shorter than half of prodorsum. Lamellar cusps without teeth. Translamella absent. Rostral (ro, 90–102), lamellar (le, 151–164) and interlamellar (in, 176– 205) setae simple, slightly barbed. Bothridial setae (ss, 40–48) clavate, with short stalk (12–20) and oval, rounded distally, indistinctly barbed head (28). Tutoria (tu) sable-like, long, curving downward, pointed. Exobothridial setae (ex, 41) thin, slightly barbed. Ecol. Mont., 2 (2), 2015, 98-108 105 ORIBATID MITES FROM TASMANIA Notogaster. Anterior margin convex. Pteromorphs broadly rounded laterally. Dorsophragmata (D) of medium size, connected medially. Four pairs of oval porose areas present, with distinct borders: Aa (28–32 × 20–22) little larger than A1, A2 and A3 (16–24 × 12–16). Ten pairs of notogastral setae setiform, with short attenuate tips, thin, smooth; p1–p3 (45–49) shorter than other seven pairs (65–69). Lyrifissures ia, im, ip, ih and ips distinct. Opisthonotal gland openings (gla) located laterally to A1. Gnathosoma. Subcapitulum longer than wide (233–246 × 172–180). Subcapitular setae setiform, slightly barbed; a (36–41) shorter than h and m (both 53–57). Adoral setae and their alveoli absent. Palps (147) with setation 0–2–1–3–9(+ω). Solenidion attached to eupathidium, both located on dorsal tubercle. Chelicerae (266–287) with two simple, barbed setae; cha (102–106) longer than chb (45–49). Trägårdh’s organ (Tg) long, tapered. Lateral podosomal and epimeral regions. Pedotecta I (Pd I) large, concave in dorsal view. Pedotecta II (Pd II) of medium size, triangular in ventral view. Both pedotecta scale-like in lateral view. Genal teeth (gt) elongate narrowly triangular. Apodemes 1, 2, sejugal and 3 distinctly developed, not fused medially. Epimeral setal formula 3–1–3–3. Epimeral setae setiform, thin, indistinctly or slightly barbed; setae 1b, 3b and 3c (61–73) longer than other (45–49). Custodia (cus) with long, thin, pointed tips. Discidia (dis) triangular. Circumpedal carinae (cp) distinct. Anogenital region. Six pairs of genital (g1–g6), one pair of aggenital (ag), two pairs of anal (an1, an2) and three pairs of adanal (ad1–ad3) setae similar in length (36–41), simple, thin, indistinctly barbed. Lyrifissures iad located close to anal aperture, in inverse apoanal position.
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