Galumna (Galumna) gigantea, Ermilov & Kolesnikov & Kontschán & Klimov, 2023

Ermilov, Sergey G., Kolesnikov, Vasiliy B., Kontschán, Jenő & Klimov, Pavel B., 2023, Taxonomic contribution to the knowledge of Galumnidae (Acari, Oribatida, Galumnidae) from Cuba, Zootaxa 5258 (4), pp. 465-474 : 471-473

Galumna (Galumna) gigantea sp. nov.

( Fig. 4 )

Type material. Holotype (male) and four paratypes (two males and two females): Cuba, 221′N, 807′W, Cienfuegos Province, Sierra del Escambray, El Nicho, leaf litter in mixed forest (unknown date and collector; collection of the Tyumen State University Museum of Zoology , Tyumen, Russia; Gashev et al. 2005).

The holotype is deposited in the collection of the Senckenberg Museum of Natural History, Görlitz, Germany; four paratypes are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia. All specimens are preserved in 70% solution of ethanol with a drop of glycerol.

Etymology. The species name gigantea refers to the very big body size.

Diagnosis. Body length: 1050–1155. Body surface microgranulate. Rostrum rounded. Lamellar and sublamellar lines slightly divergent distally, L directed to lateral side of prodorsum. Rostral, lamellar and interlamellar setae comparatively short,setiform,smooth; le located on L.Bothridial seta long, setiform,slightly roughened.Dorsosejugal porose area present. Dorsosejugal suture complete. Three pairs of porose areas developed: Aa boomerang-like; A1 long, narrowly arch-like; A3 long, narrowly elongate oval. Median pore absent. Lyrifissure im located close and anteriorly to A1. Epimeral and anogenital setae comparatively short, setiform, smooth. Circumpedal carina medium-sized, directed to 3b but not reaching it. Adanal lyrifissure located close and parallel to the posterior part of anal plate. Postanal porose area narrowly elongate oval. Leg solenidion on tibia IV inserted in anterior part of the segment.

Description of adult. Measurements. Body length: 1095 (holotype), 1050–1155 (paratypes); notogaster width: 825 (holotype), 780–855 (paratypes).

Integument. Body color black. Body surface densely microgranulate (visible under high magnification, 1000). Antiaxial side of leg femora I–IV and trochanters III and IV partially striate and tuberculate.

Prodorsum ( Figs 4A, C ). Rostrum rounded. Lamellar and sublamellar lines thin, slightly divergent distally, L directed to lateral side of prodorsum, S curving backwards. Rostral (75–86), lamellar (75–86) and interlamellar (64– 71) setae setiform, smooth; le located on L. Bothridial seta (153–161) setiform, slightly roughened. Dorsosejugal porose area oval (49–60 × 13–15), transversely oriented, located posterolaterally to insertion of in. Dorsophragma medium-sized, elongate longitudinally.

Notogaster ( Figs 4A, C, D ). Dorsosejugal suture complete, but median part slightly observed. All notogastral setae represented by setal alveoli. Three pairs of porose areas developed, clearly bordered: Aa boomerang-like (transverse part: 150–172 × 11–15; longitudinal part: 150–161 × 9–15); A1 (202–225 × 7–15) narrowly arch-like; A3 (150–176 × 7–15) narrowly elongate oval; la inserted posteriorly to transverse part of Aa. Median pore absent. Opisthonotal gland opening and all lyrifissures distinct: gla located anterolaterally to A1; im close and anteriorly to A1; ip between p 1 and p 2, nearer to p 1; ih and ips close to each other, anteriorly to p 3.

Gnathosoma. Generally, similar to P. (P.) cienfuegosensis sp. nov. Size of subcapitulum: 243 × 225; setae (a: 49; m: 41; h: 26) setiform, roughened; a thickest, h thinnest; adoral seta (30) setiform, barbed. Length of chelicera: 315; cheliceral setae (cha: 116; chb: 71) setiform, barbed. Length of palp: 225; postpalpal seta (11) spiniform, smooth.

Epimeral and lateral podosomal regions ( Figs 4B, C ). Anterior margin of ventral plate smooth. Epimeral setal formula: 2–0–1–3; setae (1a, 4a, 4b: 34–41; 1b, 3b, 4c: 64–71) setiform, smooth. Circumpedal carina mediumsized, directed to 3b but not reaching it.

Anogenital region ( Figs 4B–D ). Genital, aggenital, anal, and adanal setae (37–45) setiform, smooth. Anterior edge of genital plate with two setae. Aggenital seta located posterolaterally to genital aperture. Adanal lyrifissure located close and parallel to the posterior part of anal plate. Adanal setae ad 1 and ad 2 posteriorly, ad 3 laterally to anal plate; distance ad 1 – ad 2 slightly shorter than ad 2 – ad 3. Postanal porose area (150–176 × 7–13) narrowly elongate oval.

Legs. Generally, similar to P. (P.) cienfuegosensis sp. nov., but tibia IV without dorsal tooth, and solenidion on tibia IV inserted in anterior part of the segment.

Remarks. Galumna (Galumna) gigantea sp. nov. is similar to G. (G.) paracapensis Ermilov, 2020 from Ethiopia (see in Ermilov & Rybalov 2020) in main morphological traits: body very large (more than 1000); rostrum rounded; bothridial seta setiform; dorsosejugal suture present; notogastral porose area Aa boomerang-like; postanal porose area elongate oval. However, the new species differs from the latter by the presence of well-developed (versus vestigial) interlamellar seta, slightly divergent distally (versus parallel) lamellar and sublamellar lines, three pairs (versus four pairs) of notogastral porose areas (A2 absent versus A2 present), the absence (versus presence) of median pore, the shape of notogastral porose area A1 (narrowly arch-like) and A3 (narrowly elongate oval) (versus A1 and A3 oval), the localization of lyrifissure im close to porose area A1 (versus equally distanced from Aa and A1).

Records of Galumnidae from Cuba 1

Allogalumna brevisetosa ( Bayartogtokh & Weigmann, 2005) : 3 ex. Distribution : Mongolia, southeastern China. New record of the species in the Neotropical region .

Allogalumna cubana Balogh & Mahunka, 1979: 9 ex. Distribution : Neotropical region.

Pergalumna obvia ( Berlese, 1914) : 21 ex. Distribution : Semicosmopolitan. New record of the species in Cuba .

Figures

FIGURE 4. Galumna (Galumna) gigantea sp. nov., adult: A—dorsal view; B—ventral view (gnathosoma, pteromorphs and legs omitted); C—right lateral view (gnathosoma, legs and pteromorph omitted); D—posterior view (part of left half omitted). Scale bar 200 μm.