Pergalumna rooensis, Ermilov, 2023

Ermilov, Sergey G., 2023, Some Galumnidae (Acari, Oribatida) from Mexico, Persian Journal of Acarology 12 (3), pp. 377-384 : 378-382

Pergalumna rooensis sp. nov. ( Figs. 1–12 )

http://zoobank.org/ urn:lsid:zoobank.org:act:AEA2C361-9B6C-4BBA-B310-4DD2663B8296

Type material

Holotype (male) and eight paratypes (four males and four females): Mexico, 20° 33' N, 87° 13' W, Quintana Roo, Municipio de Solidaridad, vicinities of Playa del Carmen, leaf litter under trees and bushes in secondary semi-evergreen tropical forest (data and collector unknown; collection of the Tyumen State University Museum of Zoology , Tyumen, Russia).

Type deposition

The holotype is deposited in the collection of the Senckenberg Museum of Natural History, Görlitz, Germany; eight 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.

Diagnosis

Body length: 465–555. Rostrum rounded. Rostral seta long, setiform, barbed; lamellar and interlamellar setae minute, setiform, smooth; bothridial seta long, clavate or fusiform, barbed. Dorsosejugal suture and porose area present. Three pairs of rounded notogastral porose areas; Aa located near to pteromorphal hinge. Median pore absent. Lyrifissure im located close and anteromedially or anteriorly to A1. Circumpedal carina medium-sized. Epimeral and anogenital setae comparatively short or minute, roughened or smooth. Postanal porose area elongate oval. Solenidion on tibia IV inserted in anterior part of the segment.

Description

Measurements – Body length: 495 (holotype), 465–490 (male paratypes), 540–555 (female paratypes); notogaster width: 375 (holotype), 330–375 (male paratypes), 390–405 (female paratypes).

Integument – Body color brown. Body surface microgranulate sculpturing (visible under high magnification, ×1000). Rostrum, laterobasal part of prodorsum and anterior and lateral parts of pteromorph slightly striate; lateral part of epimere I with longitudinally elongate microtuberculate area; antiaxial side of leg femora I–IV and trochanters III, IV partially tuberculate. Lateral part of body partially with microgranulate cerotegument.

Prodorsum – Rostrum rounded. Lamellar and sublamellar lines thin, parallel, curving backwards mediodistally. Rostral seta (41–45) setiform, barbed; lamellar and interlamellar setae (4) setiform, smooth; le located very close to L; bothridial seta (75–86) with long stalk and shorter clavate or fusiform, barbed head. Dorsosejugal porose area oval (13–15 × 7–11), located posterolaterally to insertion of in. Dorsophragma comparatively long, oblique.

Notogaster – Dorsosejugal suture present. All notogastral setae represented by setal alveoli. Three pairs of rounded porose areas developed (Aa: 26–34; A1, A3: 15–22); Aa located near to pteromorphal hinge, anteriorly to la. Median pore absent. Opisthonotal gland opening and all lyrifissures distinct: gla located laterally to A1; im located close and anteromedially or anteriorly to A1; ih anteromedially to p 3; ip between p 1 and p 2; ips posterolaterally to p 3.

Gnathosoma – Size of subcapitulum: 116–124 × 101–109; subcapitular (a: 19; m, h: 13) and adoral (7–9) setae setiform, barbed. Length of chelicera: 154–161; setae (cha: 45–49; chb: 30–32) setiform, barbed. Length of palp: 97–105; postpalpal seta (7) spiniform, smooth.

Epimeral and lateral podosomal regions – Anterior margin of ventral plate smooth. Epimeral setal formula: 1–0–1–3. Setae 1b, 3b (13–15) and 4c (15–17) setiform, roughened; 4a, 4b (4) setiform, smooth. Circumpedal carina medium-sized, directed to insertion of 3b but distinctly not reaching it.

Anogenital region – Genital setae g 1 (11) and g 2 (5–7) setiform, roughened, others (g 3 – g 6: 4) setiform, smooth; aggenital, anal and adanal setae (4) setiform, smooth. Anterior edge of genital plate with two setae but g 3 inserted close to it. Aggenital seta located between genital and anal apertures, closer to the former. Adanal lyrifissure located close and parallel to the middle of anal plate. Adanal setae ad 1 and ad 2 posteriorly, ad 3 laterally to anal plate; distance ad 1 – ad 2 shorter than ad 2 – ad 3. Postanal porose area elongate oval (30–41 × 17–19).

Legs – Median claw distinctly thicker than lateral claws, all slightly barbed on dorsal side. Porose area on all femora and on trochanters III, IV well visible; proximoventral porose area on tarsi and distoventral porose area on tibiae present but poorly 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 on tarsi I inserted between solenidia ω 1 and ω 2. Solenidion on tibia IV inserted in anterior part of the segment.

Comparison

Pergalumna rooensis sp. nov. is most similar to P. makarovae Ermilov, Sidorchuk & Rybalov, 2010 from Ethiopia in main morphological traits: rostrum rounded; bothridial seta with developed head; dorsosejugal suture present; three pairs of rounded notogastral porose areas, with Aa located near to pteromorphal hinge; interlamellar seta minute or absent. However, the new species differs from the latter by the larger body size (length: 465–555 versus 336–348), minute (versus medium-sized) lamellar seta, narrowly elongate head (versus rounded) of the bothridial seta, and the localization of notogastral lyrifissures im (close and anteromedial or anterior to porose area A1 versus between setal alveoli lm and lp) and ia (atypically distant from pteromorphal hinge versus typically close).

Etymology

The species name rooensis refers to the place of origin, the Free and Sovereign State of Quintana Roo.

Figures

Figures 1–2. Pergalumna rooensis sp. nov. (adult; legs not shown) – 1. Dorsal view; 2. Ventral view (gnathosoma, legs and right pteromorph not shown).

Figures 3–8. Pergalumna rooensis sp. nov. (adult) – 3. Right lateral view (gnathosoma, legs and right pteromorph not shown); 4. Posterior view; 5. Anterior view or prodorsum. 6. Subcapitulum, ventral view; 7. Palp, right, antiaxial view; 8. Chelicera, right, antiaxial view.

Figures 9–12. Pergalumna rooensis sp. nov. (adult) – 9. Leg I, right, antiaxial view; 10. Leg II, without tarsus, right, antiaxial view; 11. Leg III, without tarsus, left, antiaxial view; 12. Leg IV, left, antiaxial view.