Dolicheremaeus phatthayaensis, Tang & Zhang & Guo & Luo & Jiang & Pan, 2023

Tang, Jin, Zhang, Gongaote, Guo, Junqi, Luo, Lingxuan, Jiang, Jiamei & Pan, Hongbo, 2023, New Faunistic And Taxonomic Data On Oribatid Mites (Acari: Oribatida) Of Thailand, Acta Zoologica Academiae Scientiarum Hungaricae 69 (2), pp. 93-116 : 96-100

Dolicheremaeus phatthayaensis sp. n.

https://zoobank.org/0127E020-77E9-4 C c06-940 D d-46037202E9 C cB ( Figs 1 , 2 )

Material examined – Holotype (female) and eight paratypes (four males and four females): Thailand, Chonburi province, vicinities of Phatthaya city, 12°44’26.6”N, 100°50’29.0”E, litter in mixed forest near the beach, 31.I.2023 (leg. A. A. Khaustov).

Additional (non-type) material: 49 specimens; label as for the type material.

Type deposition – The holotype is deposited in the collection of the Senckenberg Museum of Natural History, Görlitz, Germany; eight paratypes and non-type material 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 phatthayaensis refers to the place of origin, vicinities of Phatthaya city.

Diagnosis – Body length: 600–750. Dorsal side of prodorsum and posterior part of notogaster and anogenital plate sparsely tuberculate; notogaster and anogenital region foveolate. Interlamellar seta long, rod-like, barbed; bothridial seta long, lanceolate, slightly roughened. Lateral prodorsal condyles present, each consisting of two tubercle-like parts; medial prodorsal condyles absent. Lateral notogastral condyles present, quadrangular, with depressed anteromedial part; medial notogastral condyles absent. All notogastral setae long (c, lm reaching insertions of lm, h 2, respectively), subflagellate, barbed. Epimeral and anogenital setae setiform, barbed; distance ad 3 – ad 3 longer than ad 2 – ad 2. Adanal lyrifissure located close and lateral to anal plate. Leg seta u on tarsi I setiform, on tarsi II – IV thorn-like.

Description of adult – Measurements. Body length: 690 (holotype), 600–750 (paratypes); notogaster width: 330 (holotype), 270–360 (paratypes). No clear differences between males and females in body size. Body length/width ratio: 2.0–2.2.

Integument. Body color light brown, but legs and genital plates dark brown. Body surface covered by densely microgranulate cerotegument; dorsal side of prodorsum (between costulae), posterior part of notogaster and anogenital plate, partially apodeme I and sternal apodeme with sparse tubercles (diameter up to 2); lateral part of prodorsum with dense tubercles (diameter up to 1); notogaster (except posterior part), subcapitular mentum, anogenital region (except posterior part) including anal plate, partially pedotectum I and costula, and lateral part of all epimeres with foveolae (diameter up to 7); lateral part of body (between bothridium and acetabula II, III) with dense tubercles (diameter up to 7).

Prodorsum. Rostrum broadly rounded. Costula long, protruding anteriorly to insertion of rostral seta. Tutorial carina absent. Rostral (71–75) and lamellar (101–105) setae setiform, barbed; interlamellar seta (120–135) rod-like, barbed; bothridial seta (their length out of bothridium: 105–112) with long stalk and short, lanceolate, slightly roughened head; exobothridial seta (30–34) setiform, slightly barbed. Each lateral prodorsal condyle double, represented by two tubercle-like parts; medial prodorsal condyles absent.

Notogaster. One pair of lateral notogastral condyles quadrangular, with depressed anteromedial part; medial notogastral condyles absent. All notogastral setae long (154–176; c, lm reaching insertions of lm, h 2, respectively), subflagellate, barbed. All lyrifissures and opisthonotal gland opening distinct.

Gnathosoma . Typical for Otocepheidae (e.g., ERMILOV & KHAUSTOV 2020, ERMILOV & STARÝ 2022). Subcapitulum size: 131–139 × 90–97; subcapitular setae (a: 26–30; m: 45–49; h: 56–60) setiform, a roughened, m and h barbed. Palp (length: 116–120) setation: 0–2–1–3– 8(+ω); postpalpal seta (9–11) spiniform, smooth. Chelicera length: 131–139; cheliceral setae (cha: 37–41; chb: 17–19) setiform, barbed.

Epimeral and lateral podosomal regions. Epimeral setal formula: 3–1–3–3; all setae (1a, 2a, 3a, 4b: 30–34; 1b, 3b, 3c: 64–75; 1c, 4a: 79–86; 4c: 52–56) setiform, barbed. Pedotectum I represented by large lamina.

Anogenital region. Aggenital lyrifissure located laterally to genital aperture. Genital (26–30), aggenital (49–56), anal (an 1: 56–64; an 2: 71–75), and adanal (ad 1: 82–90; ad 2, ad 3: 105– 112) setae setiform, barbed; distance ad 3 – ad 3 longer than ad 2 – ad 2; distance an 1 – an 1 shorter than an 2 – an 2. Adanal lyrifissure located close and lateral to anal plate.

Legs. Claw of each leg strong, slightly barbed on dorsal side. Dorsal side of all tarsi without teeth. Dorsoparaxial porose area on femora I– IV well visible, on trochanters III, IV left, antiaxial view; E = leg IV, left, antiaxial view. Scale bars: 100 μm (A), 50 μm (B–E)

not observed. Formulas of leg setation and solenidia: I (1–4–3–4–16) [1–2–2], II (1–4–3–3–15) [1–1–2], III (2–3–1–2–15) [1–1–0], IV (1–2–2–2–12) [0–1–0]; homology of setae and solenidia indicated in Table 1. Solenidion φ 1 on tibia I very long, subflagellate, other solenidia medium-sized, thickened, rounded distally. Seta u on tarsi I setiform, on tarsi II – IV thorn-like.

Remarks – Dolicheremaeus phatthayaensis sp. n. is morphologically most similar to D. perisi Pérez-Íñigo, 1969 from Equatorial Guinea and D. wangi Aoki et Hu, 1993 from Southeast China in having lanceolate bothridial seta and long, subflagellate notogastral setae, and in the absence of medial prodorsal and medial notogastral condyles. However, the new species differs from both species by the presence of double (versus single) each prodorsal lateral condyle and long (versus medium-sized) notogastral setae in anterior part of the notogaster, and the morphology of lateral notogastral condyle (quadrangular, with depressed anteromedial part versus tubercle-like).

Figures

Fig. 1. Dolicheremaeus phatthayaensis sp. n., adult (not shown: legs): A = dorsal view; B = ventral view; C = right lateral view. Scale bar: 100 μm

Fig. 2. Dolicheremaeus phatthayaensis sp. n., adult: A = posterior view; B = leg I, right, antiax- ial view; C = leg II (not shown: tarsus), right, antiaxial view; D = leg III (not shown: tarsus),