Phylloribatula latiseta, Ermilov & Salavatulin, 2023

Ermilov, Sergey G. & Salavatulin, Vladimir M., 2023, Taxonomic contribution to the knowledge of the oribatid mite family Scheloribatidae (Acari, Oribatida), with description of three new species from Vietnam, Zootaxa 5336 (2), pp. 233-246 : 238-241

Phylloribatula latiseta sp. nov.

( Figures 3 , 4 )

Type material. Holotype (male) and nine paratypes (three males and six females): Vietnam, Dong Nai Province, Dong Nai Biosphere Reserve, Cat Tien National Park , 11°26′35.11′′N, 107°26′01.38′′E, about 130 m a.s.l., branches from one tree Dipterocarpus alatus at the height of 25 m (sample: PrD3), 01.XII.2022–5.XII.2022 (leg. V.M. Salavatulin and A.A. Kudrin).

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

Diagnosis. Body length: 210–240. Body covered by dense conical and bacillar components of cerotegument; surface microsculpturing tuberculate. Translamella interrupted medially, represented by two short, oblique lines. Rostral and lamellar setae long, setiform, barbed; interlamellar seta short, phylliform, dilated distally, barbed; bothridial seta with globular, barbed head. All notogastral setae short, narrowly phylliform, acuminate, barbed. Three pairs of sacculi. Epimeral formula: 3-1-2-2. Aggenital setae absent.

Description. Measurements. Body length: 210 (holotype), 210 (male paratypes), 232–240 (female paratypes); notogaster width: 120 (holotype), 120 (male paratypes), 135–142 (female paratypes).

Integument ( Figs 3A–C ; 4B, 4F ). Body light brown. Body covered by thick layer of cerotegument consisting dense conical and bacillar components. Surface microsculpturing tuberculate; subcapitular mentum partially striate.

Prodorsum ( Figs 3A, C ). Rostrum rounded. Lamella strong, about 1/2 length of prodorsum; translamella interrupted medially, represented by two short, oblique lines; sublamella, sublamellar porose area and prolamella absent; tutorium lineate. Rostral and lamellar setae (24–26) setiform, barbed; interlamellar seta (13–15) phylliform, dilated distally, barbed; exobothridial seta (7) setiform, thin, roughened; bothridial seta (22) with short stalk and globular, barbed head, entirely visible in dorsal aspect.

Notogaster ( Figs 3A, C ; 4A ). Dorsosejugal suture distinct, straight. All setae (19–22) narrowly phylliform, acuminate, barbed. Three pairs of sacculi drop-like. Opisthonotal gland opening and all lyrifissures well visible.

Gnathosoma (4B–D). Subcapitulum size: 52–60 × 37–41; subcapitular setae (a: 111; m: 13; h: 15) setiform, thin, roughened; both adoral setae (6) setiform, barbed. Palp length: 34–37; setation: 0-2-1-2-9(+ω); postpalpal seta (6) spiniform, slightly roughened. Chelicera length: 52–60; setae (cha: 17–19; chb: 13–15) setiform, barbed.

Epimeral and lateral podosomal regions ( Figs 3B, C ). Epimeral formula: 3-1-2-2; all setae (1b, 3b, 4a, 4c: 11; 1a, 1c, 2a, 3a: 7) setiform, thin, roughened. Humerosejugal porose area Am, discidium and circumpedal carina not observed.

Anogenital region ( Figs 3B, C ; 4A ). All genital setae (7) setiform, thin, slightly roughened; anal (7–9) and adanal (11–13) setae setiform, thin, slightly barbed; ad 3 thinner than ad 1 and ad 2; aggenital setae absent. Adanal lyrifissure close and parallel to anal plate.

Legs ( Figs 4E, F ). Empodial and both lateral claws strong; lateral claws with tubercle ventrodistally; all slightly barbed on dorsal side. Typical porose area on trochanters III, IV, femora I–IV. Femora III, IV with large ventrodistal ledge. Formulas of leg setation and solenidia: I (1-4-2-3-14) [1-2-2], II (1-4-2-3-13) [1-1-1], III (2-2-0-2-11) [0-1-0], IV (1-2-1-2-8) [0-1-0]; homology of setae and solenidia indicated in Table 2 . Solenidion ω 1 on tarsus I, ω on tarsus II, σ on genua I, II slightly thickened, rounded apically; φ 1 on tibia I, φ on tibiae II–IV subflagellate; other solenidia setiform. Famulus inserted anterior to ω 1.

Remarks. Phylloribatula latiseta sp. nov. differs from all representatives of the genus by the morphology of notogastral setae (narrowly phylliform versus broadly phylliform) and the absence of aggenital setae (versus presence).

Etymology. The specific epithet latiseta (“broad” in Latin) alludes to morphology of the notogastral setae in the new species.

Figures

FIGURE 3. Phylloribatula latiseta sp. nov., adult (gnathosoma and legs omitted): A—dorsal view; B—ventral view; C—right lateral view. Scale bar 50 μm.

FIGURE 4. Phylloribatula latiseta sp. nov., adult: A—posterior view; B—subcapitulum, ventral view; C—palp, left, paraxial view; D—chelicera, left, paraxial view; E—leg I, left, paraxial view; F—leg IV, left, antiaxial view. Scale bars 50 μm (A), 10 μm (B–D), 20 μm (E, F).