Pergalumna (Pergalumna) parafrater, Ermilov & Starý, 2022

Ermilov, Sergey G. & Starý, Josef, 2022, Three new species of Pergalumna (Acari, Oribatida, Galumnidae) from Malawi, with updated identification key to known species of the genus from the Afrotropical region, Zootaxa 5133 (2), pp. 226-240 : 234-236

Pergalumna (Pergalumna) parafrater sp. nov.

( Figs 4G–I ; 6A–E )

Diagnosis. Body length: 962–1062. Body surface densely microgranulate. Pteromorph partially with short rugose and elongate tubercles. Rostrum rounded. Rostral, lamellar and interlamellar setae long, setiform, barbed; bothridial seta long, setiform, shortly ciliated. Mediobasal part of prodorsum with large amorphous lenticulus. Dorsosejugal suture interrupted medially. Three pairs of comparatively large oval porose areas (Aa, A1 and A3); Aa located between setal alveoli la and lm, nearer to lm. Median pore present. Lyrifissure im located anterolaterally to A1 and removed from it. Subcapitular seta a longest and thickest, h shortest and thinnest; h located close to anterior edge of mentum. Epimeral and anogenital setae (except shortest, thin, smooth aggenital setae) short, setiform, barbed. Circumpedal carina of medium length, directed to insertion of 3b. Adanal lyrifissure located close and inverse oblique to anal plate. Postanal porose area narrowly elongate oval. Leg famulus inserted between seta ft” and solenidion ω 2; leg solenidion on tibia IV inserted in anterior part of the segment, but close to the middle.

Description of adult. Measurements. Body length: 1045 (holotype: female), 962–1062 (nine paratypes: nine females); notogaster width: 780 (holotype), 747–796 (nine paratypes).

Integument. Body color dark brown. Body surface densely microgranulate. Lateral side of body partially with microgranulate cerotegument. Pteromorph partially with short rugoa and elongate tubercles. Lateral part of epimeres I, II with distinct elongate tubercles and stria. Antiaxial side of leg femora I-IV and trochanters III and IV partially with elongate tubercles.

Prodorsum. Rostrum rounded.Lamellar and sublamellar lines thin, parallel, curving backwards.Rostral, lamellar and interlamellar setae (98–110) setiform, barbed; le distinctly removed from L. Bothridial seta (143–159) setiform, shortly ciliated in both sides. Dorsosejugal porose area elongate oval (20–28 × 6–12), transversely oriented, located posterolaterally to insertion of interlamellar seta. Mediobasal part with large amorphous lenticulus. Dorsophragma distinctly elongate longitudinally.

Notogaster. Dorsosejugal suture interrupted medially. Ten pairs of notogastral setae represented by setal alveoli. Three pairs of oval porose areas (Aa, A1 and A3: 53–73 × 28–32; sometimes A1 largest, up to 90 × 41, A3 smallest, up to 32 × 16); A2 absent; Aa located between setal alveoli la and lm, nearer to lm. Median pore present, represented by one fovea, located between A1. Opisthonotal gland opening and all lyrifissures distinct: gla located anterolaterally to A1; im anterolaterally to A1 and removed from it; ip between A3 and p 2; ih and ips close to each other, anteriorly to p 3.

Gnathosoma. Size of subcapitulum: 205–217 × 176–205. Subcapitular setae a (41) and m (24) setiform, slightly barbed; h (4) setiform, smooth; a thickest, h thinnest; setae h located close to each other and to anterior edge of mentum. Adoral seta (16) setiform, barbed. Length of chelicera: 250–270; cheliceral setae (cha: 86–90; chb: 57–61) setiform, barbed. Length of palp: 159–172. Postpalpal seta (8) spiniform, smooth.

Epimeral and lateral podosomal regions. Anterior margin of ventral plate smooth. Epimeral setal formula: 1-0-2-3. Setae (20–28; sometimes 3b longer, up to 41) setiform, barbed. Pedotectum II rounded in ventral aspect. Circumpedal carina of medium length, directed to insertion of 3b.

Anogenital region. Genital (24–28; sometimes g 1 up to 32), anal (24–28; sometimes up to 36) and adanal (24–28) setae setiform, barbed; aggenital seta (6–8) setiform, thin, smooth. Anterior edge of genital plate with three setae. Aggenital seta located between genital and anal apertures, nearer to the former. Adanal lyrifissure located close and inverse oblique to anal plate. Adanal setae ad 1 and ad 2 posteriorly, ad 3 laterally to anal plate; distance ad 1 – ad 2 shorter than ad 2 – ad 3. Postanal porose area narrowly elongate oval (20-28 × 6-8). Ovipositor (479 × 86) with three blades (217) and longer distal section (beyond middle fold; 262); setae ψ 1 and τ 1 (77) rod-like, smooth; ψ 2, τ a, τ b, τ c (28) and six coronal setae (12) stiff, smooth.

Legs. Similar to P. dedzaensis sp. nov. ( Table 1 ). Famulus of tarsus I inserted between seta ft” and solenidion ω 2. Solenidion on tibia IV inserted in anterior part of the segment, but close to the middle.

Material examined. Holotype (female) and nine paratypes (nine females): Central Malawi, Dedza District, Dedza Mountain , 14°21’42.3”S, 34°10’50.0”E, 1690 m a.s.l., sifting litter in forest (sample #14), Winkler extraction, 28.XI.2018 (leg. P. Baňař and P. Hlaváč).

Type deposition. The holotype is deposited in the collection of the SMNH; nine paratypes are deposited in the collection of the TSUMZ. All specimens are preserved in 70% solution of ethanol with a drop of glycerol.

Etymology. The specific name parafrater refers to the similarity between the new species and Pergalumna frater Balogh, 1960 .

Remarks. Pergalumna parafrater sp. nov. is morphologically most similar to P. frater Balogh, 1960 from the Afrotropical region and Japan in the absence of dorsosejugal suture and in the presence of median pore, setiform bothridial seta, three pairs of oval notogastral porose areas (Aa located between la and lm, nearer to lm), and long interlamellar seta. However, the new species differs from P. frater by the larger body length (962–1062 versus 465–510), large notogastral porose areas (versus small), similar length of rostral, lamellar and interlamellar setae (versus le longer than ro and in), the inverse oblique (versus parallel) localization of adanal lyrifissure to anal plate, and the presence (versus absence) of short rugoa and elongate tubercles on pteromorph.

Figures

FIGURE 4. Pergalumna (Pergalumna) dedzaensis sp. nov. (A, B), P. (P.) paratsavoensis sp. nov. (C–F) and P. (P.) parafrater sp. nov. (G–I), dissected adult, photo images: A—lamellar seta and partially lamellar and sublamellar lines, anterolateral view; B—right genital plate; C—rostrum, dorsal view; D—inner rostral tooth; E—anterior dentate margin of ventral plate; F— tuberculate sculpturing of leg trochanter IV; G—striate and tuberculate sculpturing of anterior part of pteromorph; H—striate and tuberculate sculpturing of lateral part of pteromorph; I—adanal lyrifissure.

FIGURE 6. Pergalumna (Pergalumna) parafrater sp. nov., adult:A—dorsal view; B—anterior part of prodorsum, dorsoanterior view; C—ventral view (gnathosoma, legs and right pteromorph not shown); D—right lateral view (gnathosoma, legs and pteromorph not shown); E—posterior view (left pteromorph not shown). Scale bars 100 μm (A, C–E), 50 μm (B).