Pergalumna (Pergalumna) krisperi, 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 : 575-578

Pergalumna (Pergalumna) krisperi sp. nov.

( Figs 11–19 )

Diagnosis. Body size: 249–282 × 182–232. Rostral and lamellar setae of medium size, slightly barbed. Interlamellar setae minute. Bothridial setae clavate, barbed. Lamellar and sublamellar lines thin, parallel. Anterior notogastral margin not developed. Four pairs of notogastral porose areas: Aa triangular, transversally elongated, A1 – A3 rounded. Median pore present. Postanal porose area absent. Anal and ano-adanal setae short.

Description. Measurements. Very small species. Body length: 249 (holotype: female), 249–282 (5 paratypes: 3 females and 2 males); notogaster width: 182 (holotype), 182–232 (5 paratypes). Without sexual dimorphism.

Integument. Body color light brownish, covered by dense microgranular cerotegument (diameter of granules less than 1). 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. Lamellar and sublamellar lines distinct, thin, parallel, curving backwards. Rostral (24–28) and lamellar (32–36) setae setiform, similar in thickness, slightly barbed, directed antero-medially. Interlamellar setae (4) minute, thin, smooth. Bothridial setae (45–53) clavate, with longer, smooth stalks and heads shorter, slightly elongated, barbed. Exobothridial setae and their alveoli absent. Porose areas Ad oval, transversally oriented (8 × 4).

Notogaster. Anterior notogastral margin not developed. Dorsophragmata elongated longitudinally. Notogastral setae represented by 10 pairs of alveoli. Four pairs of porose areas with clear borders. Areas Aa triangular, elongated, transversally oriented. Setal alveoli la located posteriorly to Aa. Median pore present in males and females, located between A2. All lyrifissures distinct, im and opisthonotal gland openings (gla) 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: 65–73 × 53–61. Subcapitular setae setiform, indistinctly barbed, a (12–16) longer than m (6–8) and h (6–8); a thickest, m and h thinnest. Two pairs of adoral setae (8–12) setiform, barbed. Palp length: 53–57. Axillary sacculi distinct, slightly elongated. Chelicera length: 94–98. Cheliceral setae setiform, barbed, cha (28) longer than chb (14–16).

Epimeral and lateral podosomal regions. Anterior tectum of epimere I smooth. Setal formula: 1–0–1–2. Setae thin, smooth, 3b (12–16) longer than 1a (8) and 4a and 4b (4–6). Pedotecta II trapezoid, 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, 6–8; g 3– g 6, 4–6), one pair of aggenital (8), two pairs of anal (4– 6) and three pairs of adanal (4–6) setae thin, smooth. Genital plates with two genital setae on anterior edge. Adanal lyrifissures located close and parallel to anal plates. Distance ad 1– ad 2 shorter than ad 2– ad 3. Setae ad 3 inserted laterally to iad. Postanal porose area absent. Ovipositor size: 118 × 24; blades (41) shorter than length of distal section (beyond middle fold; 77). Each of three blades with four straight, smooth setae, ψ1 ≈ τ1 (32–36) longer than ψ2 ≈ τ a ≈ τ b ≈ τ c (16). Six coronal setae (4) spiniform.

Legs. Morphology of leg segments, setae and solenidia typical for Pergalumna (e.g. Engelbrecht 1972; Ermilov & Anichkin 2011). Median claw 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 (female) and 5 paratypes (3 females and 2 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; one paratype is deposited in the collection of the Bavarian State Collection of Zoology, Munich, Germany; one paratype is deposited in the collection of the Senckenberg Institution Frankfurt, Germany; three paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology. The specific name is dedicated to our friend and colleague, acarologist, Dr. Günther Krisper (Institute of Zoology, University of Graz, Graz, Austria).

Remarks. The new species is morphologically most similar to Pergalumna (Pergalumna) cardosensis Pérez- Íñigo & Baggio, 1986 from Brazil and Peru (see Pérez-Íñigo & Baggio 1986) in having clavate bothridial setae and elongate triangular notogastral porose areas Aa and in the absence of anterior margin of notogaster. However, it differs from the latter by the smaller body size (249–282 × 182–232 vs. 468 × 360), rostral and lamellar setae of medium size (vs. minute) and the presence of four pairs of notogastral porose areas (vs. three pairs, A2 absent).

Figures

FIGURES 11 – 14. Pergalumna (Pergalumna) krisperi sp. nov., adult: 11 — dorsal view; 12 — ventral view (legs not shown); 13 — subcapitulum, ventral view; 14 — part of epimeral and podosomal regions (on right side; legs not shown) with sejugal apodeme, apodeme III, pedotectum II, discidium, setae 3 b and 4 a and anterior part of circumpedal carina. Scale bars 100 µm (11, 12), 20 µm (13, 14).

FIGURES 15 – 19. Pergalumna (Pergalumna) krisperi sp. nov., adult: 15 — anterior part of body, lateral view (subcapitulum and legs not shown); 16 — posterior view; 17 — right genital plate, aggenital seta and epimeral seta 4 b; 18 — right anal plate, adanal lyrifissure and adanal setae; 19 — tibia IV, right, paraxial view. Scale bars 100 µm (15, 16), 20 µm (17 – 19).