Trigonuropoda (Latipilitrigon) foliata, Tang & Zhang & Guo & Luo & Jiang & Pan, 2023

Tang, Jin, Zhang, Gongaote, Guo, Junqi, Luo, Lingxuan, Jiang, Jiamei & Pan, Hongbo, 2023, A New Species Of Trigonuropoda (Mesostigmata: Uropodina) From Vietnam, Acta Zoologica Academiae Scientiarum Hungaricae 69 (2), pp. 117-126 : 120-123

publication ID	https://zoobank.org/585B5C4F-4C16-4F0B-ACE8-EBF7BACDA7C8
persistent identifier	https://treatment.plazi.org/id/0382B93B-FFEC-FF81-FE8C-8A1FDB710E39
treatment provided by	Felipe
scientific name	Trigonuropoda (Latipilitrigon) foliata
status	sp. nov.

Treatment

Trigonuropoda (Latipilitrigon) foliata sp. n.

http://zoobank.org/ 5A684CB3-6FBC-4290-A988-9A4D202FAF7E ( Figs 1–10 View Figs 1–2 View Figs 3–5 View Figs 6–9 View Fig )

Material examined – Holotype: female, Southern Vietnam, Lam Dong Province, Bidoup Nui Ba National Park , mixed pine-dominated forest (12°10’– 12°11’N 108°40’– 108°41’E), soil, leaf-litter, altitude 1533 m, 6th December, 2013, coll. A. E. Anichkin and S. G. Ermilov. Paratypes. Two females and two males, same data as holotype GoogleMaps .

Description of female (n = 3) – Dorsal idiosoma ( Fig. 1 View Figs 1–2 ). Length of idiosoma 285–290 µm, width 230–234 µm (holotype 290 x 231). The dorsal side is oval-shaped and highly convex. The dorsal shield sculptured is foveate with sparse oval pores on the whole surface except a smooth lateral region. Dorsal setae lanceolate (leaf-form), ± 40 pairs, arranged in longitudinal rows (cosmotrichia-type). Marginal shield united anteriorly with a dorso-central region, with a dozen pairs of setae. In the posterior part of the dorsal shield a strongly sclerotized roller (bulge) with four setae of a different type.

Ventral idiosoma ( Fig. 3 View Figs 3–5 ). Tritosternal base narrow (12 µm), lacinia three-branched and pilose (median c. 20 µm and laterals 10 µm), lateral branches narrow and shorter than bifurcate median branch. Intercoxal region smooth, with three pairs of sternal setae (as microsetae), setae st1 – 3–4 µm long, st2 – 4–5 µm, st3 – 4–5 µm and st4 – 7–8 µm. Genital shield (epigynium) 83–87 µm long, 51–53 µm width (holotype 85 × 53 µm), with rounded anterior margin and flat posterior margin, extending mid-level coxa IV. Surface foveate with small alveolar pits, covered with small, deep oval pits; diameter of pits larger on posterior half than anterior. Below the genital shield, there is a distinct foveolate structure with two types of setae – three pairs of simple (27–36 µm) and eight pairs of lanceolate setae (10–12 µm). Peri-anal setae also lanceolate, but distinctly shorter (5 µm). Pedofossae of legs I–IV present, rounded. Peritremes long, prestigmatal part with a bend near stigma and with a long angle of ~90°, poststigmatal part straight.

Gnathosoma. Epistome narrow, lateral margins bearing small denticles ( Fig. 4 View Figs 3–5 ). Corniculi horn-like and weakly sclerotized, internal malae with pilose margins. Hypostomal setae h1 flage-shape (27–30 µm), h2 short thickened and serrate (5 µm), h3 simple (16–19 µm), palpcoxal setae pc flattened and serrated (14 µm). Deutosternal groove smooth, lateral margins with a few denticles between insertion of h2 and h3 ( Fig. 5 View Figs 3–5 ). Fixed digit of a chelicera is long (24–27 µm – from base of nodus to the apex) with 5–6 small median teeth located on a base. Movable digit is shorter (19–22 µm – from base to apex), with a tiny median tooth and without a conspicuous arthrodial process ( Fig. 2 View Figs 1–2 ).

Legs ( Figs 6–9 View Figs 6–9 ). Tarsi I–IV each with a pair of weak claws and pulvillus. Lengths of legs: leg I: 153–166 µm, leg II: 120–127 µm, leg III: 127–135 µm, leg IV: 134–144 µm.

Description of male (n = 2) ( Fig. 10 View Fig ) – Length of idiosoma 282–290 µm, width 222–235 µm. Sculpture and chaetotaxy of the dorsal shield as in female.

Ventral idiosoma. Intercoxal region foveate, covered with alveolar pits. Five pairs of sternal setae present, setae st1–st4 (µm) situated on the anterior region of a genital opening, setae st5 situated at the level of the posterior margin of a genital opening. Genital opening smooth and rounded in outline (25–30 µm) located at the height of IV coxae. Below are three pairs of simple setae 30–35 µm) and nine pairs of lanceolate setae (8–10 µm). Peri-anal setae slightly smaller 5 µm).

Legs. Tarsi I–IV each with a pair of weak claws and pulvillus. Lengths of legs: leg I: 172–189 µm, leg II: 145–152 µm, leg III: 128–135 µm, leg IV: 148–155 µm.

Etymology – The name “foliata ” refers to the leaf-like setae.

Remarks – Trigonuropoda (Latipilitrigon) foliata sp. n. is somewhat similar to species such as T. (L.) latipilis Hirschmann, 1975, T. (L.) magnaporula Hirschmann, 1975, T. (L.) nonpolyphenus Hirschmann, 1975 and T.(L.) tuberculata Hirschmann, 1975. The dorsal shield of all these species is foveate, and the hypostome or chelicera is also similar. The main difference, however, lies in the type of setae, because in T. (L.) foliata the dorsal setae and most of the ventral setae are lanceolate, leaf-shaped, while in other species the setae are simple or serrate.

The most similar species to T. (L.) foliata is T. (L.) magnaporula. They have similar setae st1–st3, ornamentation of the genital shield, and a similar shape of the bulge on the posterior part of the dorsal shield. They differ not only in the type of setae, but also in many other features. The shape of the idiosoma is different, because T. (L.) foliata is regularly oval, while in T. (L.) magnaporula it is evidently narrowed in the anterior part. The shape of the peritreme is different in both species, e.g. in T. (L.) foliata the post-stigmal section is relatively short, while in T. (L.) magnaporula it is significantly longer.