Rhinoppia (Rhinoppia) paraundulata, Ermilov, 2016

Ermilov, S. G., 2016, New Oppiidae (Acari, Oribatida) from Chile, Acarologia 56 (4), pp. 505-516 : 511-515

Rhinoppia (Rhinoppia) paraundulata n. sp.

( Figures 4-6)

Diagnosis — Body size: 398 × 232 – 265. Rostrum with inverse trapezoid indentation. Interbothridial region with one pair of short, longitudinal ridges. Rostral and lamellar setae short, thin, erect, smooth. Interlamellar and exobothridial setae long, setiform, indistinctly barbed. Bothridial setae with dilated unilaterally heads having four to five cilia. Notogastral setae long, setiform, smooth, la inserted antero-laterally to lm. Five pairs of genital setae. Anogenital setae thin, setiform, smooth.

Description — Measurements – Small species. Body length: 398 (holotype, female), 398 (two paratypes: two males); notogaster width: 265 (holotype), 232, 248 (two paratypes).

Integument — Body color light brownish. Body surface smooth, but lateral sides (between bothridia and pedotecta II and III) with tuberculate cerotegument (diameter of tubercles up to 4).

Prodorsum ( Figures 4A, 5A) — Rostrum with inverse trapezoid indentation. Costulae and transcostula absent. Longitudinal rows, comprising several muscle sigillae, developed in front of the bothridia. Interbothridial region with one pair of short, parallel, longitudinal ridges (r). Postbothridial tubercles strong, simple. Rostral and lamellar setae similar in length (12 – 14), thin, erect, smooth. Interlamellar and exobothridial setae also similar in length (61 – 65), but long, setiform, indistinctly barbed, ex inserted on distinct tubercles. Bothridial setae (65 – 69) with long stalks and shorter, dilated heads having four to five cilia unilaterally.

Notogaster ( Figures 4A, 5A) — Anterior border with one pair of short cristae and a trapezoid protruding. Ten pairs of notogastral setae long (p 1 - p 3, 34 – 36; others 53 – 57), setiform, smooth. Setae la inserted antero-laterally to lm. Lyrifissures ia, im, ip, ih and ips and opisthonotal gland openings well visible.

Gnathosoma ( Figures 4B, 5A) — Subcapitulum longer than wide (110 – 114 × 61 – 65). Subcapitular setae setiform, smooth, m (24) longer than a and h (14 – 16). Palps (53 – 57) with setation 0-2-1-3- 8(+ω). Postpalpal setae (6) spiniform. Chelicerae (114 – 118) with two setiform, barbed setae; cha (32) longer than chb (20). Trägårdh’s organ tapered.

Epimeral and lateral podosomal regions ( Figures 4B, 5A) — Apodemes 4 slightly semioval (forming a weak ridge in lateral view). Epimeral setal formula: 3-1-3-3; setae setiform, indistinctly barbed; 1b and 3c (24 – 28) longer than others (12). Pedotecta I represented by small laminae. Discidia well developed, triangular, rounded distally.

Anogenital region ( Figures 4B, 5A) — Five pairs of genital (g 1 - g 5, 16 – 20), one pair of aggenital (16 – 20), three pairs of adanal (16 – 20) and two pairs of anal (16 – 20) setae setiform, smooth. Adanal lyrifissures distinct, paraanal.

Legs ( Figures 5 B-6) — Claw of each leg smooth. Formulas of leg setation and solenidia: I (1-5-2-4- 20) [1-2-2], II (1-5-2-4-16) [1-1-2], III (2-3-1-3-15) [1- 1-0], IV (1-2-2-3-12) [0-1-0]; homology of setae and solenidia indicated in Table 1. Setae p setiform on tarsi I, and very short, thin on tarsi II-IV. Solenidia ω 1 on tarsi I and II, ’ 2 on tibiae I and σ on genua III thickened, blunt-ended, solenidia ω 2 on tarsi I slightly blumnt-ended, solenidia ’ on tibia II and III stick-like, erect, other solenidia setiform. Famuli () thickened, straight, inserted posteriorly to solenidia ω 1.

Material examined — Holotype (female) and two paratypes (two males): Chile, vicinity of Punta Arenas, 53°38’02.8"S, 65°31’01.6"W, swamp, in Sphagnum magellanicum , 18.XI.2014 ( V. A. Stolbov and S.A. Ivanov).

Type deposition — The holotype is deposited in the collection of the Senckenberg Institution , Görlitz, Germany ; two paratypes are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology — The specific name paraundulata refers to the similarity between the new species to the species Rhinoppia (Rhinoppia) undulata ( Mahunka and Mahunka-Papp 2010) .

Remarks — Rhinoppia (Rhinoppia) paraundulata n. sp. is morphologically most similar to R. (Rhinoppia) undulata ( Mahunka and Mahunka-Papp 2010) from Hungary in having an inverse trapezoid indentation of the rostrum. However, the new species differs from the latter by the long notogastral setae (vs. short), the presence of longitudinal ridges in the interbothridial region (vs. ridges transversely oriented) and five pairs of genital setae (vs, six pairs), and by the interlamellar setae distinctly longer than rostral and lamellar setae (vs. interlamellar, lamellar and rostral setae similar in length).