Pergalumna (Pergalumna) paratsavoensis, 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 : 231-234

Pergalumna (Pergalumna) paratsavoensis sp. nov.

( Figs 4C–F ; 5A–E )

Diagnosis. Body length: 680–796. Body surface densely microgranulate. Rostrum pointed. Rostral and lamellar setae long, setiform, barbed; interlamellar seta short, setiform, smooth; bothridial seta long, setiform, shortly ciliated. Dorsosejugal suture interrupted medially. Three pairs (Aa, A1 and A3) of comparatively large, oval porose areas; Aa located between setal alveoli la and lm, nearer to lm. Median pore absent. Lyrifissure im located anteriorly to A1 and removed from it. Subcapitular setae of medium length, similar in length and thickness; h removed from anterior edge of mentum. Anterior margin of ventral plate dentate. Epimeral and anogenital (except shortest setiform, roughened aggenital setae) short, slightly stiff, barbed. Circumpedal carina of medium length, directed to insertion of 3b. Adanal lyrifissure located close and parallel to anal plate. Postanal porose area narrowly elongate oval. Leg famulus inserted close and anteriorly to solenidion ω 2; leg solenidion on tibia IV inserted in the middle of the segment.

Description of adult. Measurements. Body length: 796 (holotype: female), 680–796 (three paratypes: three females); notogaster width: 581 (holotype), 481–581 (three paratypes).

Integument. Body color brown. Body surface densely microgranulate. Lateral side of body partially with microgranulate cerotegument. 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 pointed. Lamellar and sublamellar lines thin, parallel, curving backwards. Rostral and lamellar setae (65–77) setiform, barbed; le distinctly removed from L. Interlamellar seta (4–6) setiform, thin, smooth. Bothridial seta (135–151) setiform, shortly ciliated in both sides. Dorsosejugal porose area elongate oval (24–41 4–8), transversely oriented, located posterolaterally to insertion of interlamellar seta. 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: 41–57 × 20–28; sometimes A3 up to 24 × 16); A2 absent; Aa located between setal alveoli la and lm, nearer to lm. Median pore absent. Opisthonotal gland opening and all lyrifissures distinct: gla located laterally to A1; im anteriorly to A1 and removed from it; ip between p 1 and p 2; ih and ips close to each other, anteriorly to p 3.

Gnathosoma. Size of subcapitulum: 184–196 × 168–176. Subcapitular setae similar in length (28–36) and thickness, setiform, barbed; h removed from anterior edge of mentum. Adoral seta (16) setiform, barbed. Length of chelicera: 241–250; cheliceral setae (cha: 82–86; chb: 53–57) setiform, barbed. Length of palp: 147–151. Postpalpal seta (6) spiniform, smooth.

Epimeral and lateral podosomal regions. Anterior margin of ventral plate dentate. Epimeral setal formula: 1- 0-2-3. Setae (1a, 4a, 4b: 28–36; 3b, 3c, 4c: 36–45) slightly stiff, barbed. Pedotectum II rounded in ventral aspect.

Circumpedal carina of medium length, directed to insertion of 3b.

Anogenital region. Genital (28–36), anal (36–41) and adanal (36–41) setae slightly stiff, barbed; aggenital seta (12–16) setiform, thin, roughened. Anterior edge of genital plate with two setae. Aggenital seta located between genital and anal apertures, nearer to the former. Adanal lyrifissure located close and parallel to anal plate. Adanal setae ad 1 and ad 2 posteriorly, ad 3 anterolaterally to iad and laterally to anal plate; distance ad 1 – ad 2 shorter than ad 2 – ad 3. Postanal porose area narrowly elongate oval (41–53 × 6–8). Ovipositor (356 × 77) with three blades (151) and longer distal section (beyond middle fold; 205); setae ψ 1 and τ 1 (73) rod-like, smooth; ψ 2, τ a, τ b, τ c (24) and six coronal setae (16) stiff, smooth.

Legs. Similar to P. dedzaensis sp. nov. ( Table 1 ). Famulus of tarsus I inserted close and anteriorly to solenidion ω 2. Solenidion on tibia IV inserted in the middle of the segment.

Material examined. Holotype (female) and three paratypes (three females): Southern Malawi, Zomba District, Zomba environs, 15º22’13.5”S, 35º19’23.2”E, 1081 m a.s.l., sifting litter in forest (sample #11), Winkler extraction, 26.XI.2018 (leg. P. Baňař and P. Hlaváč).

Type deposition. The holotype is deposited in the collection of the SMNH; three 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 paratsavoensis refers to the similarity between the new species and Pergalumna tsavoensis Mahunka, 1986 .

Remarks. Pergalumna paratsavoensis sp. nov. is morphologically most similar to P. jenoi Ermilov & Starý, 2018 and P. tsavoensis Mahunka, 1986 (see also Ermilov et al. 2014) from the Afrotropical region in the presence of dentate anterior margin of ventral margin. However, the new species differs from P. jenoi by the larger body length (680–796 versus 481–597), minute (versus long) interlamellar seta, large (versus small) notogastral porose areas, long (versus short) dorsophragma, comparatively short (versus long) adanal setae ad 1 and ad 2, the presence (versus absence) of dorsosejugal and postanal porose areas, and the absence (versus presence) of dorsosejugal suture, lack of reticulate pattern on pteromorph and striate sculpturing on genital plate; from P. tsavoensis by the pointed (versus rounded) rostrum, minute (versus long) interlamellar seta and the presence (versus absence) of postanal porose area.

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 5. Pergalumna (Pergalumna) paratsavoensis 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).