Pergalumna (Pergalumna) lenticulata, Ermilov, Sergey G. & Friedrich, Stefan, 2016

Ermilov, Sergey G. & Friedrich, Stefan, 2016, New Pergalumna (Acari, Oribatida, Galumnidae) from Peru, Zootaxa 4088 (4), pp. 571-582 : 578-581

Pergalumna (Pergalumna) lenticulata sp. nov.

( Figs 20–29 )

Diagnosis. Body size: 929–1162 × 796–929. Rostrum with two lateral teeth. Prodorsum heavily striate, notogaster and anogenital region slightly striate. Notogaster, pteromorphs and anogenital region foveolate. Epimeral region tuberculate. Rostral and lamellar setae of medium size, barbed. Interlamellar setae short, barbed. Bothridial setae setiform, barbed. Lamellar and sublamellar lines parallel, L thickened, S thin. Anterior notogastral margin developed. Lenticulus present. Three pairs of notogastral porose areas rounded, A1 absent. Median pore and postanal porose area absent. Anal and ano-adanal setae short, barbed.

Description. Measurements. Very large species. Body length: 996 (holotype: male), 929–1162 (11 paratypes: 6 females and 5 males); notogaster width: 846 (holotype), 796–929 (11 paratypes). Without sexual dimorphism.

Integument. Body color black (only teneral mites light brown), covered by dense microgranular cerotegument (diameter of granules less than 1). Surface of prodorsum heavily striate; notogaster, anogenital region (except smooth genital and anal plates) and basal parts of pteromorphs slightly striate. Surface of notogaster, pteromorphs and anogenital region foveolate; foveoles distinctly separated from each to other and well visible, distinctly larger on pteromorphs and anterior part of notogaster (up to 8). Epimeral region with rounded and elongated tubercles (their diameter and length up to 8). Prodorsum with one transverse striate band (located anterior to interlamellar setae). Ventral body sides with two lateral, transversal striate bands located between genital and anal plates, and one arcuate striate band posteriorly to anal plates, extending marginally into the ano-adanal region.

Prodorsum. Rostrum broadly rounded, with one strong tooth (t) on each side. Lamellar lines thickened (but not costula-like), sublamellar lines thin, both pairs parallel, curving backwards. Rostral and lamellar setae similar in length (118–123) and thickness, setiform, barbed, directed antero-medially. Interlamellar setae (12–16) short, thin, barbed. Bothridial setae (135–147) setiform, slightly thickened, barbed, directed postero-laterad. Exobothridial setae and their alveoli absent. Porose areas Ad absent.

Notogaster. Anterior notogastral margin well developed. Light lenticulus (len) present, with distinct borders, located in basal part of prodorsum and anterior part of notogaster. Dorsophragmata elongated longitudinally. Notogastral setae represented by 10 pairs of alveoli. Three pairs (Aa, A2, A3) of porose areas rounded, similar in diameter (24–32), with clear borders. Areas A1 always absent. Setal alveoli lm located posteriorly or medioposteriorly to Aa. Median pore absent in males and females. All lyrifissures distinct, im and opisthonotal gland openings located anteriorly to A2 and distanced from them.

Gnathosoma . Morphology of subcapitulum, palps and chelicerae typical for Pergalumna (e.g. Engelbrecht 1972; Ermilov & Anichkin 2011). Subcapitulum size: 278–287 × 229–246. Subcapitular setae setiform, barbed, h (45–53) longer than m (32–26) and a (32–26); a thickest, m thinnest. Two pairs of adoral setae (28–32) setiform, barbed. Palp length: 180–188. Axillary sacculi distinct, slightly elongated. Chelicera length: 332–336. Cheliceral setae setiform, barbed, cha (94) longer than chb (61–69).

Epimeral and lateral podosomal regions. Anterior tectum of epimere I smooth. Setal formula: 2–0–2–3. Setae 1c represented by alveoli. Other setae thin, barbed, 1b (53–65) longer than 3b, 3c and 4c (32–41) and 4a and 4b (8– 10). Pedotecta II triangular, narrowly rounded distally in ventral view. Discidia sharply triangular. Circumpedal carinae directed to insertions of 3b.

Anogenital region. Six pairs of genital (g 1, g 2, 36–41; g 3– g 6, 14–16), one pair of aggenital (8–10), two pairs of anal (8–10) and three pairs of adanal (8–10) setae thin, barbed. Genital plates with three genital setae on anterior edge. Adanal lyrifissures located parallel to anal plates, slightly distanced from them. Distance ad 1– ad 2 shorter than ad 2– ad 3. Setae ad 3 inserted postero-laterally to iad. Postanal porose area absent. Ovipositor size: 471 × 86; blades (139) shorter than length of distal section (beyond middle fold; 332). Each of three blades with four straight, smooth setae, ψ1 ≈ τ1 (90–98) longer than ψ2 ≈ τ a ≈ τ b ≈ τ c (32–41). Six coronal setae (8) spiniform.

Legs. Morphology of leg segments, setae and solenidia typical for Pergalumna (e.g. Engelbrecht 1972; Ermilov & Anichkin 2011). Median claw slightly thicker than laterals, all serrate on dorsal side. Formulas of leg setation and solenidia: I (1–4–3–4–20) [1–2–2], II (1–4–3–4–15) [1–1–2], III (1–2–1–3–15) [1–1–0], IV (1–2–2– 3–12) [0–1–0]; homology of setae and solenidia indicated in Table 1 . Solenidion φ of tibiae IV inserted dorsally at about 2/3 length of segment.

Material examined. Holotype (male) and 11 paratypes (6 females and 5 males): see “Material and methods” section.

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

Etymology. The specific name lenticulata refers to the presence of lenticulus.

Remarks. The new species is morphologically most similar to Pergalumna (Pergalumna) decorata Balogh & Mahunka, 1977 from the Neotropical region (see Balogh & Mahunka 1977) in having striate and foveolate body surface, setiform bothridial setae and three pairs of notogastral porose areas, and the absence of median pore and postanal porose area, however, it differs from the latter by the larger body size (929–1162 × 796–929 vs. 637–653 × 469–494) and the presence of lenticulus (vs. absent) and bidentate rostrum (vs. rounded).

Figures

FIGURES 20 – 24. Pergalumna (Pergalumna) lenticulata sp. nov., adult: 20 — dorsal view; 21 — ventral view (legs not shown); 22 — rostrum, dorso-frontal view; 23 — subcapitulum, ventral view; 24 — part of epimeral and podosomal regions (on right side; legs not shown) with sejugal apodeme, apodeme III, pedotectum II, discidium, setae 3 b, 3 c, 4 a and 4 c and anterior part of circumpedal carina. Scale bars 200 µm (20, 21), 20 µm (22 – 24).

FIGURES 25 – 29. Pergalumna (Pergalumna) lenticulata sp. nov., adult: 25 — anterior part of body, lateral view (subcapitulum and legs not shown); 26 — posterior view; 27 — right genital plate and epimeral seta 4 b; 28 — right anal plate, adanal lyrifissure and adanal setae; 29 — tibia IV, left, antiaxial view. Scale bars 200 µm (25, 26), 20 µm (27 – 29).