Galumna (Galumna) luisi, Ermilov & Friedrich & Georgiev, 2025

Ermilov, Sergey G., Friedrich, Stefan & Georgiev, Dilian, 2025, Two new species of oribatid mites (Acari, Oribatida) from the Afrotropical region, Persian Journal of Acarology 14, pp. 345-356 : 350-354

Galumna (Galumna) luisi sp. nov. ( Figs. 2 , 13–22 )

http://zoobank.org/ urn:lsid:zoobank.org:act:307C9C5C-50EC-4CD2-B9D2-C4B38B07A095

Type material

Holotype (male) and two paratypes (two males): Uganda, Buvi , Nortwest of Buvi Lodge, wetland at the shore of Lake Victoria, 0° 07′ 43.0″ N, 32° 26′ 44.0″ E, 1146 m a.s.l., detritus among Cyperus papyrus ( Fig. 2 ), 26.vii.2022 – 1.viii.2022 (D. Georgiev).

Type deposition

The holotype and two paratypes are deposited in the collection of the University of Tyumen, Museum of Zoology, Tyumen, Russia. All specimens are preserved in 70% solution of ethanol with a drop of glycerol .

Diagnosis

Body length: 495–525. Rostrum protruding, rounded. Rostral region with strong bulge. Lamellar and sublamellar lines parallel, curving backwards at ventral end. Rostral, lamellar, and interlamellar setae long, setiform, barbed; in˃le˃ro; bothridial seta long, lanceolate, with unilaterally dilated, barbed head having distal spike. Dorsosejugal porose area present. Dorsosejugal suture complete. Anteromedial part of notogaster with long longitudinal fold having short lateral branches. Four pairs of porose areas developed: Aa elongate oval, longitudinally oriented, located close to pteromorphal hinge; A1 and A2 nearly circular; A3 elongate oval. Median pore absent. Opisthonotal gland opening located close and lateral to A1; lyrifissure im located between setal alveoli lm and lp. Epimeral setal formula: 1-0-1-2. All epimeral and anogenital setae short, setiform, roughened. Circumpedal carina medium-sized. Postanal porose area elongate oval. Leg famulus straight, inserted close and anterolateral to solenidion ω 1; solenidion of tibia IV inserted in anterior part of dorsal side of segment.

Description

Measurements – Body length: 495 (holotype), 525, 525 (paratypes); body width: 315 (holotype), 300, 330 (paratypes).

Integument ( Figs. 13, 14, 16 , 18, 19, 22 ) – Body color brown. Body slightly microgranulate microsculpturing, tubercles in rostral region and lateral part of epimere I larger; subcapitular mentum and antiaxial side of leg femora I–IV and trochanters III, IV partially with simple and elongate tubercles; laterobasal part of prodorsum slightly striate; anteromedial part of notogaster with long longitudinal fold having short lateral branches.

Prodorsum ( Figs. 13, 14, 16 ) – Rostrum protruding, rounded. Rostral region with strong bulge. Lamellar and sublamellar lines parallel, curving backwards at ventral end; L thicker than S. Rostral (64–67), lamellar (90–97), and interlamellar (108–116) setae setiform, barbed; bothridial seta (108– 116) lanceolate, with long, roughened stalk and short, unilaterally dilated, barbed head having distal spike. Dorsosejugal porose area elongate oval (22 × 7), transversely oriented, located posterior to insertion of interlamellar seta. Dorsophragma comparatively long, elongated longitudinally.

Notogaster ( Figs. 13, 16 , 17 ) – Dorsosejugal suture complete, simple. All notogastral setae represented by setal alveoli. Four pairs of porose areas developed: Aa (34–41 × 15–19) elongate oval, longitudinally oriented; A1 (19–22) and A2 (15–19) nearly circular; A3 elongate oval (34–41 × 19– 22); Aa close to pteromorphal hinge, located anterior to la. Median pore absent. Opisthonotal gland opening and all lyrifissures distinct: gla close and lateral to A1; im between lm and lp; ip lateral to p 1; ih and ips anterior to p 3.

Gnathosoma ( Fig. 18 ) – Similar to Galumna ( Ermilov 2022) . Subcapitulum size: 127–131 × 105–112; subcapitular setae (a: 22–26; m: 13–15; h: 19–22) and both adoral setae (13–15) setiform, slightly barbed; m thinner than a and h. Palp length: 94; setation: 0-2-1-3-9(+ω); postpalpal seta (7) spiniform, smooth. Chelicera length: 150; setae (cha: 49; chb: 34) setiform, barbed.

Epimeral and lateral podosomal regions ( Figs. 15, 16 ) – Epimeral setal formula: 1-0-1-2; all setae (1b, 3b: 26–30; 4a, 4b: 19–22) setiform, roughened. Circumpedal carina directed to insertion of seta 3b, bit not reaching it.

Anogenital region ( Figs. 15–17 ) – Anogenital formula: 6-1-2-3; genital (g 1: 22; g 2: 17–19; others: 13–15), aggenital (19–22), anal (19–22), and adanal (19–22) setae setiform, roughened; anterior edge of genital plate with three setae; aggenital setae equally distanced from genital and anal apertures; ad 1 and 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 elongate oval (56–60 × 15–19).

Legs ( Figs. 19–22 ) – Median claw distinctly thicker than lateral claws; all claws slightly barbed on dorsal side. Porose area on femora I–IV and on trochanters III, IV distinct; proximoventral porose area on all tarsi and distoventral porose area on all tibiae 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 2; famulus straight, inserted close and anterolateral to solenidion ω 1; seta s of tarsus I eupathidial; solenidion of tibia IV inserted in anterior part of dorsal side of segment.

Comparison

Galumna (Galumna) luisi sp. nov. is morphologically similar to Galumna (Galumna) incisa Mahunka, 1982 (see also supplementary description in Ermilov and Rybalov 2019) from the Afrotropical region in main characteristics, e.g.: rostrum rounded; lamellar and sublamellar lines parallel, curving backwards at ventral end; rostral, lamellar and interlamellar setae long, setiform, barbed; in longest, ro shortest; bothridial seta long, lanceolate; dorsosejugal porose area present; dorsosejugal suture complete; four pairs of notogastral porose areas; epimeral setal formula: 1-0-1-2; all epimeral and anogenital setae short; circumpedal carina medium-sized; postanal porose area elongate oval. We have numerous specimens of G. (G.) incisa from the different populations and locations of the Afrotropical region including Ethiopia, therefore, we could compare its morphology with G. (G.) luisi . The new species can easily be distinguished from G. (G.) incisa by the larger body size (length: 495–525 versus 456–482), the morphology of the rostrum (protruding versus non protruding), the presence (versus absence) of a strong rostral bulge and a long longitudinal fold having short lateral branches in anteromedial part of the notogaster, the morphology of the notogastral porose areas Aa and A3 (clearly elongate oval versus circular), the absence (versus presence) of a median pore, and the location of the notogastral lyrifissure im (between setal alveoli lm and lp, distinctly distanced from them versus close and anterior to porose area A1) and leg famulus (close and anterolateral to solenidion ω 1 versus between solenidia ω 1 and ω 2).

Etymology

This species is named in honour of the late Prof. Dr. Luis S. Subías, the Spanish acarologist, who previously identified this new species.

Figures

Figures 1–2. Photos of the locations and habitats of oribatid mites – 1. Gymnobodes schedeli sp. nov. in Zambia; 2. Galumna (Galumna) luisi sp. nov. in Uganda.

Figures 13–16. Galumna (Galumna) luisi sp. nov. (adult, gnathosoma and legs not shown) – 13. Dorsal view; 14. Anterior part of prodorsum, anterior view; 15. Ventral view (pteromorphs, gnathosoma, and legs not shown); 16. Right lateral view (pteromorph, gnathosoma and legs not shown).

Figures 17–22. Galumna (Galumna) luisi sp. nov. (adult) – 17. Posterior view; 18. Subcapitulum, ventral view; 19. Leg I (trochanter not shown), right, antiaxial view; 20. Leg II (tarsus and trochanter not shown), right, antiaxial view; 21. Leg III (tarsus and basal part of trochanter not shown), left, antiaxial view; 22. Leg IV, left, antiaxial view.