Setoppia parrillarensis, Ermilov, 2019

Ermilov, Sergey G., 2019, New species of oribatid mites of the family Oppiidae (Acari, Oribatida) from Chile, Zootaxa 4656 (2), pp. 274-286 : 279-282

Setoppia parrillarensis sp. nov.

( Figs 4 , 5 )

Material examined. Holotype (female) and one paratype (female): Chile, Región de Magallanes y de la Antártica Chilena, Provincia de Magallanes, 30 km south-east of Punta Arenas, before Laguna Parrillar National Park , 53°23’00”S, 071°13’34”W, swamp, moss Sphagnum magellanicum, Berlese funnel extraction, 10.XI.2014 (V.A. Stolbov & S.A. Ivanov) .

Type deposition. The holotype is deposited in the collection of the Senckenberg Institute, Görlitz, Germany; one paratype is deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia. All in ethanol with drop of glycerol.

Diagnosis. Body size: 796–813 × 431–448. Rostrum narrowly rounded. Costulae and transcostula absent. Rostral and lamellar setae setiform, barbed, interlamellar setae minute, spiniform; ro longer than le and in. Bothridial setae setiform, barbed. Interbothridial region with several pairs of muscle sigillae. Nine pairs of comparatively short, setiform, barbed notogastral setae and one pair (c) of vestigial setae. Setae la inserted posterolateral to lm. Epimeral and anogenital setae short, setiform, slightly barbed. Adanal lyrifissures inverse apoanal, close to anal aperture.

Description. Measurements. Body length: 796 (holotype, female), 813 (one paratype, female); notogaster width: 431 (holotype), 448 (one paratype).

Integument. Body color brown. Body surface microfoveolate (visible only under high magnification in dissected specimens, × 1000). Rostrum and lateral parts of body between bothridia and acetabula I–III with numerous dense granules (their diameter up to 6).

Prodorsum ( Figs 4 A, 4 C ). Rostrum slightly protruding, narrowly rounded. Costulae and transcostula absent. Rostral setae (61–65) setiform, straight, barbed, slightly divergent distally. Lamellar setae (36) setiform, slightly barbed; le located closer to in than to ro. Interlamellar (4–6) and exobothridial (4) setae spiniform. Bothridial setae (139–143) setiform, barbed, specifically slightly curved mediobasally and directed upwards. Interbothridial region with two rows of numerous pairs of muscle sigillae. Interbothridial tubercles absent. Postbothridial tubercles slightly developed. Longitudinal rows, comprising several muscle sigillae, present in front of the bothridia. Lateral semi-oval prodorsal carinae present.

Notogaster ( Figs 4A, 4C, 4D ). Anterior border convex medially. Ten pairs of notogastral setae present, c (1) vestigial, others (la, lm, lp, h 3, p 3, 65–77; h 1, h 2, p 1, p 2, 57–61) setiform, barbed, la inserted posterolateral to lm. Notogastral lyrifissures ia, im, ip and ih and opisthonotal gland openings well visible, ips not observed. Circumgastric scissure and circumgastric sigillar band distinct.

Gnathosoma ( Fig. 4C ). Subcapitulum longer than wide (143–151 × 98). Subcapitular setae setiform, barbed, a (28–32) shorter than m and h (41). Adoral setae (20) setiform, thin, smooth. Palps (86) with setation 0-2-1-3-9(+1 solenidion). Postpalpal setae (8) spiniform, smooth. Chelicerae (143–151) with two setiform, barbed setae, cha (45) longer than chb (28). Trägårdh’s organ of chelicerae elongate triangular.

Epimeral and lateral podosomal regions ( Figs 4B, 4C ). Sejugal tubercles absent. Epimeral borders IV present, semi-oval. Epimeral setal formula 3-1-3-3, setae setiform, slightly barbed, 3c (49) longer than 1a, 2a and 3a (24–32) and others (36–41). Lateral ridges between bothridia and acetabula IV on lateral sides of body present. Discidia triangular.

Anogenital region ( Figs 4 B–4D). Six pairs of genital (g 1, 28–32; others, 20–24), one pair of aggenital (49–53), three pairs of adanal (49–53) and two pairs of anal (49–53) setae setiform, slightly barbed. With three pairs of genital papillae. Adanal lyrifissures distinct, in inverse apoanal position, close to anal aperture.

Legs ( Figs 5 A–5D). Leg claws smooth. Porose areas on femora I–IV not observed. 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, conical on tarsi II–IV. Famulus of tarsi I erect, slightly swollen and blunted distally, inserted posterolateral to solenidion ω 1. Seta v” on tibiae IV and setae a” and pv” on tibiae IV brush-like Solenidia ω 1 on tarsi I, ω 1 and ω 2 on tarsi II and σ on genua III bacilliform, other solenidia setiform.

Etymology. The specific name parrillarensis refers to the Laguna Parrillar National Park, near of which was collected the new species.

Remarks. Setoppia parrillarensis sp. nov. is morphologically most similar to Setoppia strinovichi ( Balogh, 1982) from Australia ( Balogh 1982) in having comparatively short lamellar, interlamellar and notogastral setae, however, the new species differs from the latter by the larger body length (796–813 versus 587), localization of notogastral setae la posterolateral to lm (versus anterolateral) and adanal lyrifissures close to anal aperture (versus distanced), the absence of costulae (versus costulae present), and the presence of minute interlamellar setae (versus interlamellar setae distinctly longer).

Figures

FIGURE 4. Setoppia parrillarensis sp. nov., adult: A—dorsal view (legs not shown); B—ventral view (gnathosoma and legs not shown); C—anterior part of body, lateral view (legs not shown); D—posterior part of body, lateral view. Scale bar 100 μm.

FIGURE 5. Setoppia parrillarensis sp. nov., adult:A—leg I, left, antiaxial view; B—genu, femur and trochanter of leg II, right, antiaxial view; C—genu, femur and trochanter of leg III, left, antiaxial view; D—leg IV, left, antiaxial view. Scale bar 50 μm.