Perscheloribates (Perscheloribates) paracuriosus, Ermilov & OConnor, 2020

Ermilov, Sergey G. & OConnor, Barry M., 2020, New Perscheloribates species (Acari, Oribatida, Scheloribatidae) phoretic on beetles (Insecta, Coleoptera), Acarologia 60 (2), pp. 289-300 : 290-295

publication ID 10.24349/acarologia/20204368


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Perscheloribates (Perscheloribates) paracuriosus

sp. nov.

Perscheloribates (Perscheloribates) paracuriosus n. sp.

Zoobank: 4637B85A-2B7A-46E5-BCEB-1BD63BD07E7D

( Figures 1–3 View Figure 1 View Figure 2 View Figure 3 )

Diagnosis — Body size: 348–381 × 166–199. Rostrum pointed. Prolamella and translamella absent. Rostral, lamellar and interlamellar setae long, setiform, barbed; ro shortest, in longest. Bothridial seta long, lanceolate, barbed. Lateral keel-shaped ridge present. Notogastral seta short, setiform, roughened, c, la, lm short, simple, others longer, flexible. Epimeral and genital setae setiform, roughened. Anal and adanal setae flexible, roughened. Leg seta it absent on all tarsi.

Description — Measurements – a relatively small species. Body length: 365 (holotype, male), 348, 381 (two paratypes, two females); notogaster width: 182 (holotype), 166, 199 (two paratypes).

Integument – Body color light brown. Body surface punctate (visible under high magnification in dissected specimens). Lateral part of prodorsum slightly microgranulate.

Prodorsum (Figs 1a, 2a) – Rostrum pointed. Lamella located dorsolaterally, about half of prodorsum (measured in lateral view). Sublamella thin, slightly shorter than lamella. Sublamellar porose area (4) rounded. Prolamella and translamella absent. Rostral (53–57), lamellar (65–73) and interlamellar (102–110) setae setiform, barbed. Bothridial seta (82–86) lanceolate, barbed, with long stalk and shorter pointed apically head. Exobothridial seta (12–16) setiform, roughened. Alveolar vestige of second exobothridial seta and lateral keel-shaped ridge present. Sejugal porose area not observed. Dorsophragma slightly elongated.

Notogaster (Figs 1a, 2a-c) – Anterior notogastral margin convex medially. Pteromorph triangular, broadly rounded distally. Ten pairs of notogastral setae setiform, roughened, with different length and morphology; c, la, lm shorter (12–16), simple, others distinctly longer lp (, 24–36; others 32–41), with flexible tip. Four pairs of sacculi with small opening and drop-like chamber. Distance S1–S1 equal S2–S2. Opisthonotal gland opening and all lyrifissures distinct. Circumgastric scissure not observed. Circumgastric sigillar band visible.

Gnathosoma ( Figs 2 View Figure 2 d-g) – Subcapitulum longer than wide (82–86 × 65–73). Three pairs of subcapitular setae setiform, barbed; h (28–32) longer than a (20–24) and m (20–24). Two pairs of adoral setae (10–12) setiform, barbed. Palp (49–53) with setation 0-2-1-3-9(+ω). Postpalpal seta (4) spiniform. Chelicera (90–94) with two setiform, barbed setae, cha (41–32) longer than chb (16–20). Trägårdh’s organ narrowly triangular.

Epimeral and lateral podosomal regions ( Figs 1b View Figure 1 , 2a View Figure 2 ) – Epimeral setal formula 3-1-3-3. Setae setiform, roughened; 1b and 3b (24–28) longer than 1c, 3c, 4a, 4b, 4c (16–20) and 1a, 2a, 3a (10–12). Setae 1c inserted laterally on pedotectum I. Pedotectum II quadrangular in ventral view, with one protruding tip. Discidium rounded distally. Circumpedal carina long, reaching pedotectum II.

Anogenital region ( Figs 1b View Figure 1 , 2 View Figure 2 a-c) – Four pairs of genital (10–12) and one pair of aggenital (12–14) setae setiform, roughened. Two pairs of anal (32–41) and three pairs of adanal (32–41) setae flexible, roughened. Adanal lyrifissure located close and parallel to anal plates. Marginal porose area not observed. Preanal organ of typical, goblet-like form. Ovipositor elongated (138 × 20), blade (65) shorter than length of distal section (beyond middle fold; 73). Each of the three blades with four smooth setae 1, ψ ≈ τ 1 (24) setiform, ψ 2 ≈ τa ≈ τb ≈ τc (12) thorn-like. Six coronal setae (2) spiniform.

Legs ( Figs 3 View Figure 3 a-d) – Claw of leg pretarsus sparsely barbed on dorsal side. Porose area on femora I–IV and on trochanters III, IV slightly visible; ventral porose area in basal part of tarsus and distal part of tibia not observed. Formulas of leg setation and solenidia: I (1-5-2-4-17) [1-2-2], II (1-5-2-4-13) [1-1-2], III (2-3-1-3-13) [1-1-0], IV (1-2-2-3-11) [0-1-0]; homology of setae and solenidia indicated in Table 1. Seta it absent on all tarsi, seta a’ absent on tarsus IV. Famulus of tarsus I short, erect, slightly swollen distally, inserted between solenidion ω 1 and seta ft”. Solenidion ω 1 on tarsus I, ω 1 and ω 2 on tarsus II and σ on genu III bacilliform, other solenidia setiform.

Material examined — Holotype (male) and two paratypes (two females): Philippines, Negros Oriental, Sibulan Municipality, Lake Balinsasayao, 09°21’N, 123°10’E, 835 m a.s.l., phoretic on a specimen of Aceraius lamellatus Gravley, 1918 ( Coleoptera , Passalidae ), 9 August 1982 (P.D. Heideman). Data on localization of mites on A. lamellatus was not reported. Host specimen in the University of Michigan Museum of Zoology ( UMMZ) bearing the voucher label, “Mites removed, B.M. OConnor #83-1800-024.” The host specimen was collected in a decaying log in primary dipterocarp forest.

Type deposition — The holotype and one paratype are deposited in the collection of the University of Michigan Museum of Zoology, Ann Arbor, MI, USA; one paratype is deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia. All specimens are stored in ethanol with a drop of glycerol.

Note: Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (’) indicates setae on anterior and double prime (”) setae on posterior side of the given leg segment. Parentheses refer to a pair of setae.

Etymology — The species name paracuriosus refers to the similarity between the new species and Perscheloribates curiosus Ermilov, 2016 .

Remarks — In the presence of a pointed rostrum, lanceolate bothridial head and developed notogastral setae, and in the absence of prolamella, the new species is similar to Perscheloribates curiosus Ermilov, 2016 from Cuba (see Ermilov & Tolstikov 2016), but differs from the latter by the morphological differentiation of the notogastral setae c, (la, lm short, simple; others distinctly longer, flexible) (versus all setae short, similar in length, simple in P. curiosus ), the presence of flexible anal and adanal setae (versus simple in P. curiosus ) and a keel-shaped ridge on the lateral side of the prodorsum (versus absent in P. curiosus ), and the absence of custodium (versus present in P. curiosus ).


University of Michigan, Museum of Zoology

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