Pterygosomatid mites of a new species group ligare (Acariformes: Pterygosomatidae: Pterygosoma) parasitizing tree iguanas (Squamata: Liolaemidae: Liolaemus) Author Fajfer, Monika Author Acuña, Daniel González text Zootaxa 2013 3693 3 301 319 journal article 10.11646/zootaxa.3693.3.1 f5b63e37-bd23-498a-8adc-5ed83e1daa41 1175-5326 216279 DD72EB94-3FD0-4C37-A5F8-E0AEDE5AF8D7 Pterygosoma ligare sp. nov. ( Figs. 1–3 ) Description. FEMALE ( holotype ). Gnathosoma . Gnathosoma placed apically. Cheliceral base 80 long, cheliceral shaft 100 long. Fixed cheliceral digit reduced. Palpal femur and genu with serrated dorsal seta each, 40 and 30 long, respectively. Subcapitular setae n 100 long. Each branch of peritremes with 29–31 chambers. Free lateral part of peritremal branch 55 long. Hypostome 175 long. Idiosoma . Idiosoma 695 long ( 655 – 745 in 3 paratypes ) and 1050 wide ( 1115 – 1135 ). Dorsum ( Figs. 1 A–D). Anterior-mid cluster with 86 setae, these setae, progressively elongated from anterior to posterior parts of this cluster ( Fig. 1 B). Lateral to this cluster, about 158–160 setae on each side present, 15–70 long ( Fig. 1 C). Among them, 1 very long seta (120 long) present on each lateral margin of dorsum. Plumose setae, 15–16 pairs, located anterior to each side of pseudoanal area. Lateral parts of idiosoma with 24–25 pairs of slightly apically expanded setae. Peripheral series represented by 12 pairs of setae, discernibly serrated distally ( Fig. 1 D). Venter ( Figs. 2 A–C) with 15 pairs of setae vm , 25–70 long, located anterior to genital area. Peripheral part of body with 19 pairs of postero-lateral plumose setae and 13 pairs of peripheral weakly serrated setae. Most part of genital slit situated ventrally. Genital series represented by slightly serrated setae g1 and 5 pairs of pseudoanal setae ps , setae ps1–2 situated dorsally, ps3–5 situated ventrally. Occasionally asymmetrical duplication observed. Legs . Coxal setae 3a slightly serrated. Leg setation: genua I–IV (5[4]-4-3-3), femora I–IV (5-5-3-3). Ventral setae of leg I serrated only at distal tip ( Fig. 2 B). FIGURE 1. Pterygosoma ligare sp. nov. , female, holotype. A , dorsal view; B , antero-dorsal seta; C , medio-lateral seta; D , peripheral seta. FIGURE 2. Pterygosoma ligare sp. nov. , female, holotype. A , ventral view; B , ventral setae of I legs; C , shape of the dorsal setae of I–IV legs and ventral setae of legs III–IV. Type material. Female holotype and 3 female paratypes from Liolaemus pictus (Duméril and Bibron) , CHILE : Arauco Province, Isla Mocha, 38º36’32”S , 73º89’87”W , 13 December 2008 , coll. D. González Acuña. Type material deposition. Holotype (ZISP T-Pt-4) and 1 paratype in the ZISP, 2 paratypes in the AMU (AMU-PTE1.1) Etymology. The specific epithet ligare refers to the Latin word “ ligare ” which means tie, unite. Differential diagnosis. This new species is similar to Pterygosoma levissima sp. nov. In females of both species the setation of legs I–IV is the same, the gnatosoma is placed terminally, the fixed cheliceral digit is reduced, the pseudoanal series is represented by five pairs of setae ps. This new species differs from P. levissima by the following features: in females of P. l i ga re, the cheliceral shaft is longer (almost 1.3 times) than the base, peritremes have 29–31 chambers and each free peritremal branch is 55 long, the antero-dorsal setae are thick and progressively elongate from the anterior to the posterior part of the setal cluster, 12 pairs of the peripheral setae are present, all setae vm are serrated and all ventral setae are slightly serrated and expand at the distal end, setae 3a are slightly serrated. In females of P. levissima , the cheliceral shaft and the base are the same length, peritremes have 23–24 chambers and each free lateral branch of the peritremes is 40 long, the antero-dorsal setae are slender and subequal in the length, 21–23 pairs of the peripheral setae are present, one pair of filiform setae vm is present and all long ventral setae (115–230 long) are smooth and tapering at the end, setae 3a are filiform.