Allogalumna paramadagascarensis, Ermilov, Sergey G. & Starý, Josef, 2020

Ermilov, Sergey G. & Starý, Josef, 2020, Two New Species Of Allogalumna (Acari, Oribatida, Galumnidae) From Madagascar, Acta Zoologica Academiae Scientiarum Hungaricae 66 (2), pp. 99-110 : 100-105

Allogalumna paramadagascarensis sp. n.

( Figs 1–4)

Diagnosis. Body size: 315–348 × 232–265. Rostrum rounded. Bothridial seta long, slightly dilated in median part, ciliate unilaterally. Rostral, lamellar and interlamellar setae setiform, smooth, ro of medium size, le and in short. Dorsosejugal porose area oval. Dorsosejugal suture absent. Four pairs of rounded notogastral porose areas. Median pore present. Epimeral and ano- genital setae short, setiform, smooth. Genital plate with one longitudinal stri- um in medial part. Postanal porose area oval. Solenidion of tibia IV inserted in the middle of the segment. Sexual dimorphism not observed.

Description. Measurements. Body length 332 (holotype, female), 315–348 (four para- types, two females and two males); notogaster width 249 (holotype), 232–265 (four paratypes). No clear differences between females and males in body size.

Integument. Body color brown. Body surface (including pteromorphs, subcapitular mentum, genital and anal plates, legs) sparsely microfoveolate (visible under high magnification, ×1000). All leg femora and trochanters III, IV with rounded or elongate tubercles antiaxially. Genital plate with one longitudinal strium in medial part.

Prodorsum ( Figs 1A, 2A). Rostrum broadly rounded. Sublamellar line slightly visi- ble, thin, curving backwards. Prodorsal leg niches and lateral ridges of prodorsum well-de- veloped. Rostral (32–36), lamellar (6–8) and interlamellar (2) setae setiform, thin, smooth, ro thickest. Bothridial seta (82–94) slightly dilated (in median part) and ciliate unilaterally. Exobothridial seta represented by alveolus. Dorsosejugal porose area (18–20 × 6–8) elon- gate oval, transversely oriented, located posterolateral to in.

Notogaster ( Figs 1A, 2 A-C). Dorsosejugal suture absent. Dorsophragma elongated longitudinally, with variable number of components. With 10 pairs of setal alveoli and four pairs of rounded porose areas, Aa (12–16) larger than others (8–12). Median pore present in both sexes, located between A1. All lyrifissures distinct, im located between lm and A1, ip between p 1 and p 2, ih and ips close to each other, anterior to p 3. Opisthonotal gland opening located posterolateral to A1 and distanced from it.

Gnathosoma ( Figs 3 A-C). Subcapitulum longer than wide: 82–90 × 73–82. Three pairs of subcapitular setae setiform, smooth, a (14) longer and thicker than m (10) and h (6). Two posterior view. Scale bar: 50 µm

Note: Roman letters refer to normal setae, Greek letters to solenidia (except ε = famulus). Single prime (’) marks setae on anterior and double prime (”) setae on posterior side of the given leg segment. Parentheses refer to a pair of setae.

pairs of adoral setae (10–12) setiform, roughened. Length of palp: 69–73. Axillary saccule distinct, elongated. Postpalpal seta (4) spiniform, smooth. Length of chelicera: 98–106. Two cheliceral setae setiform, barbed, cha (28–32) longer than chb (18–20). Trägårdh’s organ of chelicera long, elongate triangular.

Epimeral and lateral podosomal regions ( Figs 1B, 2A). Anterior margin of epimere I smooth. Pedotectum I broadly rounded, pedotectum II quadrangular, rounded distally in ventral view. Discidium triangular. Circumpedal carina slightly visible, thin, directed to seta 3b, but distinctly not reaching it. Epimeral setal formula: 1–0–1–2. Epimeral setae setiform, thin, smooth, 1b and 3b (10) longer than 4a and 4b (8).

Anogenital region ( Figs 1B, 2A–C). Six pairs of genital (g 1, 14; g 2, 10; g 3 – g 6, 6), one pair of aggenital (6), two pairs of anal (6) and three pairs of adanal (6) setae setiform, thin, smooth. Anterior edge of genital plate with two setae. Aggenital seta inserted between genital and anal apertures, closer to the former. Adanal lyrifissure located close and paral- lel to anal plate. Adanal setae ad 1 and ad 2 postanal, ad 3 paraanal and lateral to iad. Distance ad 1 – ad 2 shorter than ad 2 – ad 3. Unpaired postanal porose area oval (18–20 × 6–8).

Legs ( Figs 4 A-D). Median claw distinctly thicker than laterals, all smooth on dorsal side. Porose area on all femora and on trochanters III, IV well visible. Formulas of leg seta- tion 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. Famulus on tarsus I inserted lateral to solenidion ω 1. Solenidion of tibia IV inserted in the middle of the segment.

Material examined. Holotype (female) and four paratypes (two females and two males): Madagascar, Montagne d‘Ambre National Park , circuit Ampijoroana, evergreen of leg III, right, paraxial view; D = leg IV, left, antiaxial view. Scale bar: 20 µm rain forest, 12°31‘28‘‘S, 49°09‘52‘‘E, 950 m a.s.l., sifting of leaf litter sample under big uni- dentified tree, Winkler apparatus extraction, 13.I.2014 ( R. Ravebolun and L. Rabotenoson).

Type deposition. The holotype is deposited in the collection of the Senckenberg Insti- tute, Görlitz, Germany. Four paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia. All specimens are preserved in ethanol with a drop of glycerol .

Etymology. The species name paramadagascarensis refers to the similarity between the new species and Allogalumna madagascarensis ( Balogh, 1960) .

Remarks. Allogalumna paramadagascarensis sp. n. is morphologically simi- lar to Allogalumna madagascarensis ( Balogh, 1960) from Madagascar (see BA- LOGH 1960, MAHUNKA 1996) in having small body size, bothridial seta dilated and ciliate unilaterally, rostral seta of medium size, lamellar and interlamellar setae short, four pairs of notogastral porose areas, median pore, and the absence of dorsosejugal suture. However, the new species differs from A. madagascarensis by the presence of rounded notogastral porose areas Aa (versus distinctly elongate triangular, transversely oriented).

Also, A. paramadagascarensis sp. n. is morphologically similar to Allogalumna longula ( Balogh, 1960) from Madagascar (see BALOGH 1960) in having a small body size, bothridial seta dilated and ciliate unilaterally, lamellar and interlamellar setae short, four pairs of rounded notogastral porose areas, and the absence of dorsosejugal porose area. However, the new species differs from A. longula by the presence of an oval postanal porose area (versus bandlike, unusually long), median pore (versus absent) and rostral setae of medium size (versus short), and the localization of notogastral porose areas A1 (dorsomedially versus laterally on the notogaster).