Allogalumna (Allogalumna) beateae, Ermilov & Martens, 2021

Ermilov, Sergey G. & Martens, Jochen, 2021, A new genus and two new species of Galumnidae (Acari, Oribatida) from Nepal, Zootaxa 5039 (2), pp. 277-290 : 283-288

Allogalumna (Allogalumna) beateae sp. nov.

( Figs 5–7 ; 8K–O )

Diagnosis. Body size: 282–348 × 215–265. Rostrum nasiform, rounded. Rostral, lamellar and interlamellar setae long, thickened, slightly barbed; ro and le located comparatively close to each other. Bothridial seta setiform, barbed unilaterally. Dorsosejugal porose area present. Dorsosejugal suture interrupted medially (in light microscope). Four pairs of porose areas rounded. All notogastral setae vestigial. Epimeral and anogenital setae short, setiform, thin, roughened. Median pore and circumpedal carina absent. Postanal porose area oval. Solenidion on tibia IV inserted in the middle part of the segment.

Description of adult. Measurements. Body length: 298 (holotype: female), 282–348 (27 paratypes: eight males and 19 females); notogaster width: 215 (holotype), 215–265 (27 paratypes). No difference between males in females in body size.

Integument. Body color yellow brownish. Body surface smooth. Lateral side of body with microgranulate cerotegument.

Prodorsum. Rostrum nasiform (visible in anterior view), narrowly rounded. Sublamellar line simple, curving ventrad. Rostral (61–69), lamellar (61–69) and interlamellar (73–82) thickened, slightly barbed; ro and le located comparatively close to each other (distance ro -le clearly shorter than ro -rostral margin). Bothridial seta (114–123) setiform, barbed unilaterally; bs distinctly thinner than ro, le and in. Dorsosejugal porose area oval (12–20 × 4–6), transversely oriented, located posteriorly to insertion of interlamellar seta. Dorsophragma distinctly elongate longitudinally.

Notogaster. Dorsosejugal suture interrupted medially (in light microscope) versus slightly observed in SEM. Four pairs of porose areas rounded (Aa: 14–16; A1: 8–16; A2, A3: 8–12); Aa located close to pteromorphal hinge. All notogastral setae vestigial (1); la inserted posteriorly to Aa. Median pore absent in males and females. Opisthonotal gland opening and lyrifissures distinct: gla located laterally to A1 and distant from it; im between lm and A1; ip between p 1 and p 2, closer to the former; ih and ips close to each other, anteriorly to p 3.

Gnathosoma. Size of subcapitulum: 82–86 69–73. Subcapitular setae (a: 18–20; m, h: 12–16) setiform, roughened; a thickest. Adoral seta (10–12) setiform, barbed. Length of chelicera: 82–86. Cheliceral setae (cha: 26–28; chb: 18–20) setiform, barbed. Length of palp: 57–61. Postpalpal seta (4) spiniform, smooth.

Epimeral and lateral podosomal regions. Epimeral setal formula: 1-0-1-2. Setae (3b: 14–16; 1a, 4a, 4b: 8–10) setiform, thin, roughened. Pedotectum II rounded in ventral aspect. Discidium triangular. Circumpedal carina completely absent.

Anogenital region. Genital (g 1: 14–16; others: 8–10), aggenital (8–10), anal (8–10), and adanal (8–10) setae setiform, thin, roughened. Anterior edge of genital plate with two setae. Aggenital seta located between genital and anal apertures, equally distant from them. Adanal setae ad 1, ad 2 posterior, ad 3 lateral to anal plate; distance ad 1 – ad 2 shorter than ad 2 – ad 3. Adanal lyrifissure located close and parallel to anal plate. Postanal porose area oval (12–20 6–8).

Legs. Median claw thicker than lateral claws, all slightly barbed on dorsal side. Dorsoantiaxial porose area on femora I-IV and dorsoparaxial porose area on trochanters III, IV well visible; proximoventral porose area on tarsi I-IV and distoventral porose area on tibiae I-IV not observed. 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. Famulus of tarsus I short, stickform, slightly swollen and blunt-ended apically, inserted between solenidia ω 1 and ω 2. Seta s of tarsus I eupathidial, located before setae a. Solenidia ω 1 and ω 2 on tarsus II and σ on genu III bacilliform, other solenidia setiform, pointed or slightly rounded apically. Solenidion on tibia IV inserted in the middle part of the segment.

Type material. Holotype (female) and 27 paratypes (eight males and 19 females): locality see in the Material and methods section. The holotype and two paratypes: SMNH; 25 paratypes: TSUMZ.

Etymology. The species name is dedicated to Beate Martens, the active participant and collector of the J. Martens expeditions to various parts of Europe and Asia.

Remarks. The new species differs from all species of the genus by the presence of thickened rostral, lamellar and interlamellar setae (versus not thickened or only some setae thickened) and comparatively close to each other localization of rostral and lamellar setae (versus ro and le clearly distant from each other). In having thickened interlamellar seta and four pairs of rounded/oval notogastral porose areas, Allogalumna beateae sp. nov. is similar to A. iranica Akrami, 2015 from Iran and A. turkeyensis Grobler, Bayram & Cobanoglu, 2004 from Turkey, but differs from both (in addition to the above listed differences) by the presence of setiform bothridial seta (versus with welldeveloped head) and oval; postanal porose areas (versus elongate oval), and by the absence of median pore (versus present).

Figures

FIGURE 5. Allogalumna (Allogalumna) beateae sp. nov., adult: A—dorsal view; B—ventral view (gnathosoma, legs and right pteromorph not shown); C—right lateral view (gnathosoma, legs and pteromorph not shown); D—posterior view. Scale bar 50 μm.

FIGURE 6. Allogalumna (Allogalumna) beateae sp. nov., adult: A—prodorsum, dorsoanterior view; B—right pteromorph; С—subcapitulum, ventral view; D—palp, right, antiaxial view; E—chelicera, left, paraxial view; F—leg I, right, antiaxial view; G—leg II, without tarsus, right, antiaxial view; H—leg III, without tarsus, right, paraxial view; I—leg IV, right, paraxial view. Scale bars 50 μm (A, B), 20 μm (C–I).

FIGURE 7. Allogalumna (Allogalumna) beateae sp. nov., adult, SEM micrographs: A—dorsal view; B—ventral view; C— right lateral view; D—dorsoanterior view.

FIGURE 8. Anomalogalumna dungeri sp. nov. (A–J) and Allogalumna (Allogalumna) beateae sp. nov. (K–O), dissected adult, microscope images:A—lamellar seta and prodorsal integument; B—head of bothridial seta (deep focus); C—part of dorsosejugal region; D—integument and some notogastral setae in dorsal part of notogaster; E—integument in lateral part of notogaster; F—integument of pteromorph; G—integument of subcapitular mentum; H—part of ventral region; I—integument of anogenital region; J—integument of anal plate; K—rostrum; L—rostral seta; M—median part of lamellar seta; N—interlamellar seta; O—part of dorsosejugal region. Magnification: 10 100 (DIC).