Lasiobelba (Antennoppia) parachistyakovi Ermilov, 2016

Ermilov, S. G. & Friedrich, S., 2016, Additions to the oppioid oribatid mite fauna of Peru (Acari, Oribatida, Oppioidea), Acarologia 56 (3), pp. 379-391 : 380-384

Lasiobelba (Antennoppia) parachistyakovi Ermilov n. sp.

( Figures 1–3)

Diagnosis — Body size: 431 – 464 × 265 – 298. Rostrum rounded. Lamellar setae shorter and thinner than rostral and interlamellar setae, inserted on large tubercles, all barbed. Exobothridial setae shortest. Bothridial setae long, thick, ciliate. Notogaster with nine pairs of setiform, barbed setae, dorsal setae inserted in two parallel rows, setae c absent, la, lm and lp longer and thicker than the other setae. Epimeral setae slightly barbed. Apodemes 4 present, semioval. Discidia absent. Anogenital setae indistinctly barbed.

Description — Measurements – Body length: 431 (holotype: female), 431 – 464 (51 paratypes: 28 females and 23 males); notogaster width 282 (holotype), 265 – 298 (51 paratypes). No differences between females and males in the body sizes.

Integument ( Figs 1A, 2A ) — Body color light brownish. Body surface punctate, lateral side and podosomal region with tuberculate cerotegument (diameter tubercle up to 4).

Prodorsum ( Figs 1A, 2A ) — Rostrum slightly protruding, rounded. Rostral (ro, 47 – 51), lamellar (le, 36 – 41), interlamellar (in, 49 – 55) and exobothridial (ex, 16 – 20) setae setiform, barbed; le and ex thinnest, le inserted on large tubercles (length 8 – 10), equal distanced from ro and in. Bothridial setae (bs, 176 – 188) setiform, thick, densely ciliate. Longitudinal row of muscle sigilla present anteriad to bothridia. Interbothridial region with three pairs of muscle sigilla. Interbothridial and postbothridial tubercles absent. Lateral ridges (rl) developed between bothridia and acetabula IV, distally expanded to form a scale, which is located posterior to each bothridium.

Notogaster ( Figs 1A, 2A ) — Anterior border convex medially. Nine pairs of notogastral setae setiform, barbed, inserted in two parallel rows (except posterior setae), setae c and their alveoli absent. Setae la, lm and lp (73 – 82) longer and thicker than h 2, h 3 (36 – 45), h 1 and p 1 (20 – 24), setae p 2 and p 3 shortest (16 – 18) and thinnest. Lyrifissures ia, im and ip well developed, ih and ips not visible. Opisthonotal gland openings (gla) located laterally and close to im.

Gnathosoma ( Figs 1B, 2A , 3 A-C) — Morphology of subcapitulum, palp and chelicera typical for Lasiobelba (e.g. Ermilov et al. 2014). Subcapitulum longer than wide (110 – 114 × 73 – 82). Anteromedial parts of rutelli with very small tooth. Three pairs of subcapitular setae setiform, barbed; h and m (both 32 – 36) longer than a (20 – 24), h inserted in lateral part of mentum. Two pairs of adoral setae (or 1, or 2, 16 – 20) thin, smooth. Palps (53) with setation 0–2–1–3–8(+ω); solenidion of palptarsi as long as half of tarsi, thick, expanded distally, pressed to the surface, attached in distal parts to seta ul". Chelicerae (110–114) with two setiform setae; cha (28 – 36) ciliate unilaterally, chb (18 – 22) barbed. Antiaxial sides with one long, semioval ridge (r 1) and one short ridge (r 2). Paraxial sides with one to two small teeth. Trägårdh’s organ (Tg) tapered, slightly granulate.

sis Ermilov n. sp.

Note: Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (') marks setae on the anterior and double prime (") setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae. Tr – trochanter, Fe – femur, Ge – genu, Ti – Tibia, Ta – tarsus.

Epimeral and lateral podosomal regions ( Figs 1B, 2A ) — Sejugal apodemes slightly longer than apodemes 2, both of medium size, apodemes 4 complete, semioval, strong. Epimeral setal formula: 3– 1–3–3; all setae setiform, slightly barbed, 1a, 1c, 2a, 3a and 4b (20 – 24) shorter than 1b, 4a and 4c (35 – 45), 3c longest (53 – 61), inserted on tubercles. Seta 1c distanced from pedotecta I. Discidia absent.

Anogenital region ( Figs 1B, 2A ) — Five pairs of genital (g 1, 20 – 24; g 2 – g 5, 16 – 20), one pair of aggenital (ag, 16 – 20), three pairs of adanal (ad 1 – ad 3, 18 – 22) and two pairs of anal (an 1, an 2, 16 – 20) setae setiform, indistinctly barbed. Adanal lyrifissures (iad) distinct, located parallel and very close to anal aperture.

Legs ( Figs 1A, B, 2A–D ) — Morphology of leg segments, setae and solenidia typical for Lasiobelba (e.g. Ermilov and Kaloez 2012). Claw of each leg indistinctly serrate on dorsal side. 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 tarsus I, and very short, conical on tarsi II–IV. Famuli (Ɛ) of tarsi I short, thin, swollen and truncated distally, inserted posteriorly to solenidion ω 2.

Type deposition — The holotype is deposited in the collection of the Museo de Historia Natural , Universidad Nacional Mayor de San Marcos, Lima, Peru ; five paratypes are deposited in the collection of the Bavarian State Collection of Zoology , Munich, Germany ; five paratypes are deposited in the collection of the Senckenberg Institution Frankfurt , Germany ; 41 paratypes are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology — The specific name parachistyakovi refers to the similarity between the new species and Lasiobelba (Antennoppia) chistyakovi Ermilov and Kaloez, 2012 .

Remarks — The genus Lasiobelba comprises two subgenera and 32 species, and is distributed in the tropics ( Subías 2004, updated 2016). The main morphological traits for these genus and subgenera and an identification key for all species of Lasiobelba were presented by Ermilov et al. (2014).

The new species is morphologically most similar to Lasiobelba (Antennoppia) chistyakovi Ermilov and Kaloez, 2012 from Ecuador (see Ermilov and Kaloez 2012) in having long bothridial setae, differences of notogastral setae in length, localization of dorsal notogastral setae in two longitudinal rows and insertion of lamellar setae on large tubercles, and the absence of discidia. However, the new species differs from the latter by the morphology of bothridial setae (thick, with short cilia vs. thin, with long cilia) and longer notogastral setae (vs. comparatively shorter).

Also, Lasiobelba (Antennoppia) parachistyakovi Ermilov n. sp. is morphologically similar to Trapezoppia nova Franklin and Woas, 1992 from Brazil (see Franklin and Woas 1992) in having long, thick and ciliate bothridial setae, difference of notogastral setae in length and localization of dorsal notogastral setae in two longitudinal rows. However, it differs from the latter by the localization of adanal lyrifissures (paraanal vs. inverse apoanal), insertion of lamellar setae on large tubercles (vs. tubercle absent) and longer notogastral setae (vs. comparatively shorter).

Figures

FIGURE 2: Lasiobelba (Antennoppia) parachistyakovi Ermilov n. sp.: A – lateral view, right side (palp except trochanter and legs except basal part of leg III not illustrated); B – tibia and basal part of tarsus of leg I, right, antiaxial view; C – femur and genu of leg IV, left, antiaxial view; D – tibia and tarsus of leg IV, left, antiaxial view. Scale bar (A) 100 µm, scale bar (B–D) 50 µm.

FIGURE 3: Lasiobelba (Antennoppia) parachistyakovi Ermilov n. sp.: A – subcapitulum, ventral view, and palptrochanter; B – palp (trochanter not illustrated), left, paraxial view; C – chelicera, left, paraxial view. Scale bar (A, C; B) 16 µm.