Graptoppia (Stenoppia) magallanesensis, 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 : 282-283

Graptoppia (Stenoppia) magallanesensis sp. nov.

( Figs 6 , 7 )

Material examined. Holotype (female) and one paratype (male): 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: 221–225 × 98–106. Rostrum rounded. Costulae present, short, their mediobasal parts not developed. Transcostula absent. Rostral, lamellar and interlamellar setae setiform, slightly barbed; ro longer than le and in. Bothridial setae long, unilaterally dilated and ciliate, rounded distally. Interbothridial region with two pairs of muscle sigillae and one pair of tubercles. Nine pairs of comparatively short, setiform, roughened notogastral setae and one pair (c) of minute, needle-like setae. Setae la inserted anterolateral to lm. Epimeral and anogenital setae short, setiform, roughened.

Description. Measurements. Body length: 225 (holotype, female), 221 (one paratype, male); notogaster width: 98 (holotype), 106 (one paratype).

Integument. Body color light brownish. Body surface microfoveolate (visible only under high magnification in dissected specimens, × 1000). Lateral parts of body between bothridia and acetabula I and II with small, not numerous granules (their diameter up to 1).

Prodorsum ( Figs 6A, 6C ). Rostrum rounded. Costulae comparatively short, lineate, their mediobasal parts not developed. Transcostula absent. Rostral (20), lamellar (8) and interlamellar (8) setae setiform, slightly barbed; le located closer to in than to ro. Exobothridial setae (4) setiform, thin, smooth. Bothridial setae (24–28) with long stalk and shorter, unilaterally dilated and ciliate (with several short cilia), rounded distally head (they illusory seem globular in dorsal view). Interbothridial region with two pairs of muscle sigillae and one pair of tubercles (posterior to interlamellar setae). Postbothridial tubercles slightly developed. Longitudinal rows, comprising several muscle sigillae, present in front of the bothridia. Lateral semi-oval prodorsal carinae present.

Notogaster ( Figs 6A, 6C, 6D ). Anterior border convex medially. Ten pairs of notogastral setae present, c (4) needle-like, smooth, others (10–12) setiform, roughened, la inserted slightly anterolateral to lm. Notogastral lyrifissures ia, im, ip, ih and ips and opisthonotal gland openings well visible. Circumgastric scissure and circumgastric sigillar band distinct.

Gnathosoma ( Fig. 6C ). Subcapitulum longer than wide (57 × 41). Subcapitular setae (10) setiform, roughened. Adoral setae (4) setiform, thin, smooth. Palps (41) with setation 0-2-1-3-9(+1 solenidion). Postpalpal setae (2) spiniform, smooth. Chelicerae (57) with two setiform, barbed setae, cha (12–14) longer than chb (8). Trägårdh’s organ of chelicerae elongate triangular.

Epimeral and lateral podosomal regions ( Figs 6B, 6C ). Sejugal tubercles absent. Epimeral borders IV present, semi-oval. Epimeral setal formula 3-1-3-3, setae setiform, roughened, 3c (8) longer than others (6). Lateral ridges between bothridia and acetabula III on lateral sides of body absent. Discidia triangular.

Anogenital region ( Figs 6 B–6D). Four pairs of genital (4), one pair of aggenital (6–8), three pairs of adanal (8) and two pairs of anal (6–8) setae setiform, roughened. With three pairs of genital papillae. Adanal lyrifissures distinct, in paraanal position, close to anal aperture.

Legs ( Figs 7 A–7D). 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, swollen and blunted distally, inserted posterior to solenidion ω 1. Solenidia ω 1 on tarsi I, ω 1 and ω 2 on tarsi II, φ on tibiae III and σ on genua III bacilliform, ω 2 on tarsi I thickened, blunt-ended, other solenidia setiform.

Etymology. The specific name magallanesensis refers to the Chilean Province, Provincia de Magallanes, where the new species was collected.

Remarks. Graptoppia (Stenoppia) magallanesensis sp. nov. is morphologically most similar to Graptoppia (Stenoppia) italica ( Bernini, 1973) from the Mediterranean ( Bernini 1969, 1973) in having rounded rostrum and anterior notogastral margin, short costulae, ciliate bothridial setae and comparatively short notogastral setae, however, the new species differs from the latter by the absence of transcostula (versus transcostula present), localization of notogastral setae la anterolateral to lm (versus posterolateral), and the presence of tubercles in interbothridial region (versus tubercles absent).

Figures

FIGURE 6. Graptoppia (Stenoppia) magallanesensis 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 50 μm.

FIGURE 7. Graptoppia (Stenoppia) magallanesensis sp. nov., adult: A—leg I, right, antiaxial view; B—genu, femur and trochanter of leg II, left, antiaxial view; C—genu, femur and trochanter of leg III, left, antiaxial view; D—leg IV, left, antiaxial view. Scale bar 20 μm.