Flagellozetes (Cosmogalumna) pseudoareticulatus, Ermilov & Salavatulin, 2022

Ermilov, Sergey G. & Salavatulin, Vladimir M., 2022, New Species Of Flagellozetes (Cosmogalumna) (Acari, Oribatida, Galumnidae) From Vietnam, Acta Zoologica Academiae Scientiarum Hungaricae 68 (4), pp. 293-304 : 298-302

Flagellozetes (Cosmogalumna) pseudoareticulatus sp. n.

( Fig. 3 )

Diagnosis. Body length: 330–352. Anogenital region and centrodorsal part of notogaster with few neural ridges. Lamellar line not bifurcate mediobasally. Rostral and lamellar setae similar in length, setiform, slightly roughened. Dorsosejugal and postanal porose areas present. Four pairs of rounded porose areas. Median pore present. Lyrifissure im located close and anterior to A1. Epimeral setal formula: 1-0-1-2. Circumpedal carina short. Adanal lyrifissure located close and parallel to median part of anal plate. Leg tarsus I with 20 setae (v’ present).

Description of adult. Measurements. Small species. Body length: 352 (holotype: female), 330 (one paratype: male); notogaster width: 255 (holotype), 240 (paratype).

Integument ( Figs 3A, B ). Body color brown. Surface densely microfoveolate (visible only under high magnification in dissected specimens, 10 × 100). Laterobasal part of prodorsum slightly striate. Lateral side of body partially microgranulate. Anogenital region and centrodorsal part of notogaster with few neural ridges (without small dense cells); ridges in anogenital region located only between aggenital setae; ridges on notogaster occupy the narrow transverse area between and slightly anterior to porose areas A1-A1. Antiaxial side of leg femora I, II, IV and trochanters III, IV partially tuberculate.

1. Foveolate ornamentation (foveolae sparse, small but well visible) on body: A = absent; P = present.

2. Form of bothridial seta: C = clavate (broadly rounded distally); F = fusiform (narrowed distally).

3. One pair of longitudinal furrows on prodorsum: A = absent; P = present.

4. Lamellar line mediobasally: Bi = bifurcate; Si = simple (not bifurcate).

5. Teeth on sublamellar line: A = absent; P = present.

6. Relative length of rostral and lamellar setae: le / ro.

7. Localization of setal alveolus c on pteromorph: An = anterior to alary furrow; Po = posterior to alary furrow.

8. Number of notogastral porose areas.

9. Notogastral area with neural ridges: La = large, mostly entire surface; Me = medium-sized, broad quadrangular area between setal alveoli lm-lm and porose areas A1-A1 or slightly larger; Sm = small, narrowly transverse area between and slightly anterior to porose areas A1-A1.

10. Ornamentation of pteromorph: A = absent; Gr = heavily granulate; St = slightly or heavily striate (or with ridges).

11. Localization of notogastral lyrifissure im: Re = im between lm and A1 (or between lm and lp) and equally removed from them; Cl = im close and anterior to A1.

12. Median pore: A = absent; P = present.

13. Epimeral formula.

14. Length of circumpedal carina: L = long (reaching pedotectum I); M = medium length, directed to setal alveolus 3b but slightly not reaching it, or only reaching level of localization of acetabulum IV.

15. Ornamentation of genital plate: A = absent; St = striate.

16. Number of genital setae on anterior edge of genital plate.

17. Aggenital seta: A = absent; P = present; Re = ag equally removed from genital and anal apertures; Cl = ag closer to genital aperture; Not = not applicable (if ag absent).

18. Reticulate ornamentation in anogenital region: A = absent; P = present.

19. Anogenital area with neural ridges: La = large, mostly entire surface including adanal region; Me = medium-sized, only between genital and anal apertures; Sm = small, only between aggenital setae; Not = not applicable (if neural ridges absent).

20. Ornamentation of anal plate: A = absent; St = striate.

21. Localization of adanal lyrifissure: Re = removed from anal aperture; Cl = close to anal aperture, parallel; An = close to level of the anterior half of anal plate; Mi = close to level of the middle of anal plate; Not = not applicable (if iad removed from anal aperture).

22. Number of setae on leg tarsus I.

23. Body length.

Prodorsum ( Figs 3A, C ). Rostrum broadly rounded. Lamellar and sublamellar lines parallel, curving backwards; L -line slightly thickened, not bifurcate basally; S -line thin. Rostral and lamellar setae similar in length (28–30), setiform, slightly roughened; le inserted lateral to L -line. Interlamellar seta (2) setiform, thin, smooth. Bothridial seta (45–49) clavate, with long stalk and shorter head rounded distally, sparsely slightly roughened. Exobothridial seta absent. Dorsosejugal porose area (15–19 × 7) oval, transversely oriented, located posterolateral to in. Dorsophragma distinctly elongated longitudinally.

Notogaster ( Figs 3A, C, D ). Dorsosejugal suture complete, nearly straight medially. With 10 pairs of setal alveoli (microsetae not observed) and four pairs of rounded porose areas (Aa: 17–19; A1, A3: 11; A2: 7); Aa located close to pteromorphal hinge, anterior to setal alveolus la. Median pore present, located posterior to virtual line connected areas A2. Opisthonotal gland opening and all lyrifissures distinct: gla located lateral to A1; im close and anterior to A1; ip between p 1 and p 2; ips between p 2 and p 3; ih anterior to p 3.

Gnathosoma. Mostly similar to F. (C.) carinodentatus sp. n. except some sizes. Subcapitulum size: 86 × 79; a: 19; m, h: 11; adoral seta: 15; length of palp: 79; length of chelicera: 105; cha: 34; chb: 22.

Epimeral and lateral podosomal regions ( Figs 3B, C ). Epimeral setal formula: 1-0-1-2; all epimeral setae (3b: 19–22; 1a: 11; 4a, 4b: 7) setiform, thin, smooth. Circumpedal carina comparatively short, reaching of level of localization of acetabulum IV.

Anogenital region ( Figs 3B–D ). Genital (g 1: 15; g 2: 11; g 3 – g 6: 7), aggenital (7), anal (7), and adanal (7) setae setiform, thin, smooth. Anterior edge of genital plate with three setae. Aggenital seta equally removed from genital and anal apertures. Adanal lyrifissure located close and parallel to median part of anal plate. Adanal setae ad 1 and ad 2 posterior, ad 3 lateral to anal plate; distance ad 1 – ad 2 shorter than ad 2 – ad 3. Unpaired postanal porose area (18–22 × 7) oval.

Legs. Mostly similar to F. (C.) carinodentatus sp. n., but tarsus I with 20 setae (v’ present), and famulus inserted between solenidia ω

1 and ω

2.

Material examined. Holotype (female): Vietnam, Dong Nai Province, Dong Nai Biosphere Reserve, Cat Tien National Park , 11°25’40”N, 107°25’34”E, about 130 m a.s.l., bark from Ochrocarpos siamensis (height: 0.5 m) (sample: 3-1), 20.06.2021 – 04.07.2021 (V. M. Salavatulin and A. A. Kudrin).

One paratype (male): the same as for the holotype but tree of Haldina cardifolia (sample: 8-3) with coordinates 11°25’45”N, 107°25’38”E and other height (20 m).

Type deposition. The holotype and one paratype (preserved in 70% solution of ethanol with a drop of glycerol) are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia.

Etymology. The species name pseudoareticulatus refers to the similarity of the new species and Flagellozetes (Cosmogalumna) areticulatus ( Ermilov, Sandmann, Klarner, Widyastuti & Scheu, 2015) .

Remarks. In having neural ridges on the notogaster and in anogenital region, a median pore, four pairs of notogastral porose areas, short circumpedal carina, and the absence of stria on pteromorph, Flagellozetes (Cosmogalumna) pseudoareticulatus sp. n. is morphologically most similar to F. (C.) areticulatus ( Ermilov, Sandmann, Klarner, Widyastuti et Scheu, 2015) from the Oriental region. However, the new species differs from the latter by the comparatively long lamellar seta, ro = le (versus short, ro/le = 2.7), the localization of notogastral lyrifissure im (close and anterior to A1 versus between lm and lp, equally removed from them) and adanal seta ad 3 (lateral to iad versus anterolateral to iad), the position of aggenital seta (equally distanced from genital and anal apertures versus located closer to genital aperture), and by comparatively small area with neural ridges in anogenital region and on the notogaster (versus areas with ridges clearly larger).

Figures

Fig. 3. Flagellozetes (Cosmogalumna) pseudoareticulatus sp. n., 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 (part or left half not shown). Scale bar 50 μm