Additions to the oribatid mite (Acari, Oribatida) fauna of Guatemala, with description of a new species of Pergalumna Author Ermilov, Sergey G. text Persian Journal of Acarology 2024 2024-07-15 13 3 361 373 journal article 10.22073/pja.v13i3.85509 2251-8169 13160646 urn:lsid:zoobank.org:pub:B5F1694D-3F70-481B-AD6C-997D6F6C132B Pergalumna paraobsidiana sp. nov. ( Figs. 1–12 ) http://zoobank.org/ urn:lsid:zoobank.org:act: 2128D02D-CAA8-4DEF-8CF8-7AECB8779CF7 Type material Holotype (male) and five paratypes ( two males and three females ): Eastern Guatemala , Izabal Department , Las Escobar , 8 km SW Puerto Barrios , rainforest litter, 12–14.XI.1986 ( E.E. Lindquist ). Type deposition The holotype is deposited in the collection of the Canadian National Collection, Ottawa, Canada ; five paratypes are in the collection of the Tyumen State University Museum of Zoology , Tyumen , Russia . All specimens are preserved in 70% solution of ethanol with a drop of glycerol. Diagnosis Body length: 525–570. Prodorsum, pteromorph, ventral plate, and posterior part of notogaster densely tuberculate; anterior and central parts of notogaster with dense short longitudinal ridges. Rostrum pointed. Rostral, lamellar and interlamellar setae long, setiform, barbed; relative length: in˃le˃ro ; bothridial seta long, setiform, unilaterally shortly ciliate. Dorsosejugal porose area present. Dorsosejugal suture present but indistinct. Three pairs of porose areas present: Aa and A3 oval; A1 elongate oval; Aa located between la and lm , closer and anteromedially to la . Median pore absent. Circumpedal carina directed to insertion of seta 3b . Epimeral and anogenital setae comparatively short. Postanal porose area absent. Leg famulus curved mediodistally, directed forwards, inserted between solenidia ω 1 and ω 2 ; solenidion on tibia IV with well-developed swollen mediobasal part, inserted in posterior part of the segment. Description Measurements – Body length: 540 ( holotype ), 525–570 ( paratypes ); notogaster width: 405 ( holotype ), 375–420 ( paratypes ). No differences between males and females in body size. Integument – Body color brown. Body surface densely microgranulate sculpturing; additionally, prodorsum, pteromorph, ventral plate (including subcapitular mentum and genital and anal plates), and posterior part of notogaster densely tuberculate; anterior and central parts of notogaster with dense short longitudinal ridges. Prodorsum – Rostrum pointed. Lamellar and sublamellar lines thin, parallel, curving backwards mediodistally. Rostral (67–75), lamellar (97–105) and interlamellar (124–127) setae setiform, barbed; le removed from L ; bothridial seta (153–161) setiform, unilaterally shortly ciliate. Dorsosejugal porose area elongate oval (15–19 × 5), located posterolaterally to insertion of in . Dorsophragma comparatively long. Notogaster – Dorsosejugal suture present but indistinct. All notogastral setae represented by setal alveoli. Three pairs of porose areas developed; Aa (30–37 × 15–19) and A3 (22–30 × 15–19) oval; A1 (45–60 × 15–19) elongate oval; Aa located between la and lm , closer and anteromedially to la . Median pore absent. Opisthonotal gland opening and all lyrifissures distinct: gla located laterally to A1 ; im anterolaterally to A1 ; ip between p 1 and p 2 , closer to p 2 ; ih and ips close to each other, anteriorly to p 3 . Gnathosoma – Size of subcapitulum: 139–142 × 120–124; subcapitular ( a , h : 28–30; m : 30–34) and adoral (15–17) setae setiform, barbed. Length of palp: 105–112; setation: 0–2–1–3–9(+ω); postpalpal seta (5) spiniform, smooth. Length of chelicera: 187–191; setae ( cha : 52–56; chb : 37–39) setiform, barbed. Epimeral and lateral podosomal regions – Epimeral setal formula: 1–0–2–3; setae ( 4a , 4b : 11; 1b : 17–19; 3b : 22–26; 3c , 4c : 30–34) setiform, smooth. Circumpedal carina medium-sized, directed to insertion of seta 3b . Anogenital region – Anogenital formula: 6–1–2–3; genital ( g 1 : 17–19; others: 11), aggenital (11), anal (11), and adanal (11) setae setiform, roughened; anterior edge of genital plate with two setae; aggenital seta located between genital and anal apertures, slightly closer to the former; adanal setae ad 1 and ad 2 posteriorly, ad 3 laterally to anal plate; distance ad 1 – ad 2 shorter than ad 2 – ad 3 . Adanal lyrifissure located close and parallel to anal plate. Postanal porose area absent. Legs – Median claw distinctly thicker than lateral claws; all claws slightly barbed on dorsal side. Porose area on femora I–IV and on trochanters III, IV poorly visible; proximoventral porose area on tarsi and distoventral porose area on tibiae not observable. Formulas of leg setation and solenidia: I (1–4–3–4–20) [1–2–2], II (1–4–3–4–15) [1–1–2], III (1–2–1–3–15) [1–1–0], IV (1–2–2–3–12) [0–1– 0]; homology of setae and solenidia indicated in Table 1 ; famulus curved mediodistally, directed forwards, inserted between solenidia ω 1 and ω 2 ; solenidion on tibia IV with well-developed swollen mediobasal part, inserted in posterior part of the segment. Figures 1–4. Pergalumna paraobsidiana sp. nov. (adult) – 1. Dorsal view of body; 2. Ventral view of body (legs and right pteromorph not shown); 3. Right lateral view of body (gnathosoma, legs and right pteromorph not shown); 4. Posterior view of body (part of left half not shown). Table 1. Leg setation and solenidia of adult Pergalumna paraobsidiana sp. nov.

Leg	Tr	Fe	Ge	Ti	Ta
I	v’	d, (l), bv”	(l), v’, σ	(l), (v), φ1, φ2	(ft), (tc), (it), (p), (u), (a), s, (pv), v’, (pl), l”, ɛ, ω1, ω2
II	v’	d, (l), bv”	(l), v’, σ	(l), (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv), ω1, ω2
III	v’	d, ev’	l’, σ	l’, (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv)
IV	v’	d, ev’	d, l’	l’, (v), φ	ft'', (tc), (p), (u), (a), s, (pv)

Note: Roman letters refer to normal setae; Greek letters to solenidia (except ɛ = famulus); single quotation mark ( ’ ) designates setae on the anterior and double quotation mark ( ” ) setae on the posterior side of a given leg segment; parentheses refer to a pair of setae. Figures 5–12. Pergalumna paraobsidiana sp. nov. (adult) – 5. Anterior view of prodorsum, dorsoanterior view; 6. Subcapitulum, ventral view; 7. Palp, left, paraxial view; 8. Chelicera, left, paraxial view; 9. Leg I, right, antiaxial view; 10. Leg II (trochanter not shown), right, antiaxial view; 11. Leg III, left, antiaxial view; 12. Leg IV, left, antiaxial view. Comparison Pergalumna obsidiana sp. nov. is most similar to P. obsidiana Palacios-Vargas & Villagómez, 2017 and P. ekaterinae Páez, Villagómez & Palacios-Vargas, 2019 from Mexico in the following main traits: rostrum pointed; bothridial seta long, setiform, shortly ciliate; rostral, lamellar and interlamellar setae long; solenidion of the leg tibia IV with mediobasal swollen part. The new species differs from P. obsidiana by the following traits: body size larger (length: 525– 570 versus 443–513); anterior and central parts of notogaster with dense short longitudinal ridges (versus tuberculate); genital plate tuberculate (versus with strong transverse ridges); and rostral region without longitudinal ridge (versus with ridge). The new species differs from P. ekaterinae by the following traits: body size larger (length: 525– 570 versus 434–503); prodorsum, pteromorph, ventral plate, and posterior part of notogaster densely tuberculate, and anterior and central parts of notogaster with dense short longitudinal ridges (versus surface without heavy sculpturing); notogaster with three pairs (versus four pairs) of notogastral porose areas; posterior part of notogaster without striate bands (versus with bands). Etymology The species name paraobsidiana refers to the similarity between the new species and P. obsidiana .