Pergalumna hugocoetzeeae, Ermilov & Khaustov, 2019

Ermilov, Sergey G. & Khaustov, Alexander A., 2019, New Galumnoidea (Acari, Oribatida) from Tanzania, Zootaxa 4545 (4), pp. 531-547 : 532-533

Pergalumna hugocoetzeeae sp. nov.

( Figs 1–13 , 38–40 )

Diagnosis. Body size: 680–763 × 481–547. Body surface microgranulate; in addition, prodorsum and lateral parts of epimere I tuberculate, basal part of pteromorphs and lateral parts of epimeres I–III striate. Rostrum rounded, with two lateral teeth. Rostral, lamellar and interlamellar setae long, barbed, ro shortest, in longest. Bothridial setae setiform, ciliate. Dorsosejugal suture represented by tubercles. With three pairs of rounded porose areas, A1 absent. Porose areas Aa located between la and lm, closer to la. Median pore absent. Epimeral setal formula: 1–0–2–3. Epimeral, genital, aggenital, anal and one pair of adanal (ad 3) setae short, thin, slightly barbed. Adanal setae ad 1 and ad 2 of medium size, erect, barbed. Postanal porose area elongate oval.

Description. Measurements. Body length: 680 (holotype), 680–763 (six paratypes); notogaster width: 481 (holotype), 481–547 (six paratypes). Females larger than males: 747–763 × 531–547 versus 680–713 × 481–514.

Integument ( Fig. 38 ). Body color dark brown. Body surface (including subcapitular mentum and genital and anal plates) densely microgranulate (diameter of granules less than 1). In addition, prodorsum and lateral parts of epimere I tuberculate (diameter and length of tubercles up to 8), and basal part of pteromorphs and lateral parts of epimeres I–III striate.

Prodorsum ( Figs 1, 2 , 6, 9 , 38, 40 ). Rostrum slightly protruding in dorsal view, rounded, with two lateral teeth (well visible in frontal view). Lamellar and sublamellar lines slightly thickened, parallel, curving backwards at ventral ends. Prodorsal leg niches and lateral ridges of prodorsum well developed. Rostral (49–57), lamellar (90–98) and interlamellar (102–114) setae setiform, barbed. Insertions of lamellar setae clearly distanced from lamellar lines. Bothridial setae (123–135) setiform, shortly ciliate mediodistally. Exobothridial setae and their alveoli absent. Sejugal porose areas (12–20 × 4–6) elongate oval, transversely oriented, located posterolateral to interlamellar setae. Dorsophragmata slightly elongated.

Notogaster ( Figs 1 , 6–8 , 39 ). Dorsosejugal suture present, medially represented by small, dense tubercles. Anterior part of notogaster (close and posterior to dorsosejugal suture) with numerous, short, longitudinal depressions. With 10 pairs of setal alveoli and three pairs of rounded porose areas (28–36), A1 absent. Setal alveoli c located posterior to alary furrow on pteromorphs. Porose areas Aa located between la and lm, closer to la. Median pore absent. All lyrifissures distinct, im located anterolateral to A1, ip between p 1 and p 2, ih anterior to p 3, ips posterior to p 3. Opisthonotal gland openings located lateral and close to A2. Circumgastric sigillar band present, but poorly visible.

Gnathosoma ( Figs 3–5 ). Subcapitulum size: 143–147 × 131–135. Subcapitular setae setiform, slightly barbed, h (28–32) longer than m (12–16) and a (20–24); h thickest, a thinnest. Adoral setae (16–20) setiform, heavily barbed. Length of palps 118–127. Postpalpal setae (8) spiniform, smooth. Length of chelicerae 164–168. Cheliceral setae setiform, barbed, cha (49–53) longer than chb (28–32). Trägårdh’s organ of chelicerae long, elongate triangular.

Epimeral and lateral podosomal regions ( Figs 2 , 6 ). Anterior tectum of epimere I smooth. Pedotecta I broadly rounded, pedotecta II narrowly rounded in ventral view. Discidia triangular. Epimeral setal formula: 1–0–2–3. Epimeral setae setiform, slightly barbed, 4a and 4b (20) shorter than 1a, 3b, 3c and 4c (24–32). Circumpedal carinae of medium length, directed to insertions of setae 3b, but reaching them.

Anogenital region ( Figs 2 , 6–8 ). Six pairs of genital (g 1, 20; g 2 – g 6, 16), one pair of aggenital (16), two pairs of anal (24–32) and one pair of adanal setae (ad 3, 24–32) setae setiform, thin, slightly barbed. Anterior edge of genital plates with two setae. Aggenital setae located closer to genital plates than to anal plates. Two pairs of adanal (ad 1, ad 2, 45) setae setiform, erect, barbed. Adanal lyrifissures located close and parallel to anal plates. Adanal setae ad 1 posterior, ad 2 posterolateral, ad 3 lateral to anal aperture; ad 3 anterolateral to iad. Distance ad 1 – ad 2 shorter than ad 2 – ad 3. Postanal porose area elongate oval (24–41 × 6).

Legs ( Figs 10–13 ). Median claw distinctly thicker than laterals, all slightly barbed on dorsal side. Porose areas on all femora and on trochanters III, IV poorly visible. 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]; homologies of setae and solenidia indicated in Table 1. Famulus on tarsi I inserted between seta ft” and solenidion ω 2. Solenidion on tibiae IV inserted in their middle part.

Type deposition. The holotype and two paratypes are deposited in the collection of SMNH. Four paratypes are deposited in the collection of TSUMZ .

Etymology. The specific name is dedicated to our friend and colleague, well-known acarologist, Dr. Elizabeth Hugo-Coetzee (National Museum; University of the Free State; Bloemfontein, South Africa).

Remarks. In having microgranulate body surface, tuberculate dorsosejugal suture, three pairs of rounded notogastral porose areas and setiform, ciliate bothridial setae, Pergalumna hugocoetzeeae sp. nov. is morphologically most similar to Pergalumna margaritata Mahunka, 1989 from the Oriental region (see Mahunka 1989, 1994), Pergalumna pseudomargaritata Mahunka, 1994 from Thailand (see Mahunka 1994) and Pergalumna tuberclesejugalis Ermilov & Starý, 2018 from Cameroon (see Ermilov & Starý 2018), but clearly differs from all species listed above by the morphology of rostrum (rounded, with two lateral teeth versus pointed, without lateral teeth).

Figures

FIGURES 1–5. Pergalumna hugocoetzeeae sp. nov., adult: 1—dorsal view; 2—ventral view (gnathosoma, legs and right pteromorph not shown); 3—subcapitulum, ventral view; 4—palp, right, antiaxial view; 5—chelicera, right, antiaxial view. Scale bar 100 µm (1, 2), 20 µm (3–5).

FIGURES 6–9. Pergalumna hugocoetzeeae sp. nov., adult: 6—anterior part of body, lateral view (gnathosoma, pteromorph and legs not shown); 7—posterior part of body, lateral view; 8—posterior view; 9—rostrum, anterior view. Scale bar 100 µm.

FIGURES 10–13. Pergalumna hugocoetzeeae sp. nov., adult: 10—leg I, without trochanter, right, antiaxial view; 11—trochanter, femur and genu of leg II, right, antiaxial view; 12—trochanter, femur and genu of leg III, left, antiaxial view; 13—leg IV, left, antiaxial view. Scale bar 50 µm.

FIGURES 38–45. Galumnoidea, adults, microscope images: 38—Pergalumna hugocoetzeeae sp. nov., prodorsal sculpturing and rostrum, dorsoanterior view; 39—Pergalumna hugocoetzeeae sp. nov., dorsosejugal suture; 40—Pergalumna hugocoetzeeae sp. nov., dorsophragma and sejugal porose area; 41—Pergalumna pietertheroni sp. nov., granulate sculpturing in anogenital region; 42—Pergalumna pietertheroni sp. nov., dorsophragma and sejugal porose area; 43—Galumnella paraokinawana sp. nov., foveolate ornamentation in epimeral region; 44—Galumnella paraokinawana sp. nov., reticulate ornamentation between genital and anal apertures; 45—Galumnella paraokinawana sp. nov., claw of leg tarsus II.