Vinaphilus unicus Tran, Tran & Bonato 2019

Vinaphilus unicus Tran, Tran & Bonato, 2019 Materials Type status: Other material. Occurrence: catalogNumber: 20240224006 D; recordedBy: Chao Jiang; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: 401BAAD2-3997-5E0A-8604-6343A05E6A56; Taxon: scientificName: Vinaphilus unicus; Location: country: China; stateProvince: Hainan; locality: Jianfengling National Forest Park; verbatimElevation: 1150 m; verbatimCoordinates: 18.7148°N, 108.8761°E; Event: eventDate: 24. ii. 2024; Record Level: language: en; institutionCode: CMMI Type status: Other material. Occurrence: catalogNumber: 20240224007 D; recordedBy: Chao Jiang; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: CE7CE95D-CA6B-5151-97A7-7F8E03421CEF; Taxon: scientificName: Vinaphilus unicus; Location: country: China; stateProvince: Hainan; locality: Jianfengling National Forest Park; verbatimElevation: 1150 m; verbatimCoordinates: 18.7148°N, 108.8761°E; Event: eventDate: 24. ii. 2024; Record Level: language: en; institutionCode: CMMI Description General features. (Fig. 1 A – D) Body length of males 39–51 mm, with 85–87 leg-bearing segments. Specimen 20240224006 D measures 39 mm and has 87 leg-bearing segments; specimen 20240224007 D measures 51 mm and has 85 leg-bearing segments. Body nearly the same width anteriorly and posteriorly, becoming gradually narrower only at last 5–7 segments. Colour (in 75 % ethanol) yellowish; forcipules darker. Cephalic capsule (Fig. 3 A) subrectangular, length approximately 1.2 times width; anterior margin slightly convergent and rounded; lateral margins straight, nearly parallel to each other; posterior margin nearly straight, lacking distinct concavities or projections; all four corners smoothly rounded, without sharp angles. Longer setae scattered on anterolateral portions of cephalic plate. Clypeus and labrum (Fig. 2 D and F; Fig. 3 B and C) Clypeus ca. 1.8 times as wide as long, with lateral margins; no obvious clypeal areas; at least 57 setae, all in the anterior half of the clypeus, most of them in a subtriangular intermediate broad area, ca. 12 setae in each of 2 anterolateral smaller areas and a few other apparently broken setae close to the mid-point of the anterior margin of the clypeus. Pleurites uniformly areolate. Labral margin slightly concave, with 8 median denticles and 11–13 lateral projections on each side; the denticles darker, shorter and more closely spaced than the lateral projections; the denticles are darker, shorter and closer to each other than the lateral projections. Antennae (Fig. 3 D) composed of 14 articles. Basal articles 1–5 with sparse long setae. From ca. 6 article onwards, setae much shorter and denser. Intermediate articles about as long as wide. Ultimate article distinctly elongate, ca. 1.5 times as long as wide, ca. 1.3 times as long as the penultimate article. Mandible (Fig. 2 A and B; Fig. 3 E) A single pectinate lamella, with 20–30 elongate teeth. Each tooth about 4.5 times as long as wide. First maxillae (Fig. 2 C; Fig. 3 F) Coxosternite entire, with setae close to the anterior margin; a pair of lappets, covered with scales, a pair of lappets, each covered with scales and ca. 2 times as long as the telopodital lappet. Coxal projection subtriangular, longer than wide, with setae on the ventral side. Telopodite longer than wide, of 2 articles, with setae on the ventral side; a lappet emerging from the basal article and covered with scales, ca. 0.9 × as long as the basal article. Second maxillae (Fig. 2 C; Fig. 3 F) Coxosternite entire, with anterior margin deeply angulated, metameric pores on the central part of each half and about 7 setae near each of the posterior corners. Telopodite of 3 articles, slightly narrowing towards the tip; a number of setae on each article, most of them on the meso-ventral side; pretarsus slightly bent, narrowing and slightly spoon-shaped at the tip, bearing two marginal rows of fine filaments; associated sensilla could not be reliably resolved in the available preparations. Forcipular segment (Fig. 3 G) Tergite subtrapezoidal, ca. 2.8 times as wide as long, with lateral margins strongly converging anteriorly, approximately as wide as the cephalic plate and similar in length and width to the following tergite. The exposed part of the coxosternite is ca. 1.3 times as wide as long; its anterior margin with a shallow medial concavity and without denticles; complete coxopleural sutures, entirely ventral, sinuous and diverging anteriorly; chitin-lines incomplete, only visible in the posterior part of the coxosternite. Trochanteroprefemur ca. 1.4 times as wide as long. No denticles along the forcipule. Tarsungulum with both external and internal margins uniformly curved, except for a moderate mesal basal bulge; internal margin finely serrate. Poison calyx present. Leg-bearing segment (Fig. 3 H and I) Metatergite 1 about as wide as the subsequent one, without pretergite. No paratergites. Legs of the first pair slightly smaller than the following ones; claws simple, uniformly bent, with 2 accessory spines. Ventral glandular pores densely grouped into 3 separate fields on each metasternite, from the second to the prepenultimate leg-bearing segments: 2 paired fields in the anterior part of the metasternite, near the lateral margins. These fields are subcircular and closer to the anterior corners in the most anterior segments, whereas they are slightly elongated longitudinally and closer to mid-length in the remaining trunk; 1 subcircular medial field approximately in the centre of the metasternite in the anterior part of the body, gradually becoming closer to the posterior margin in the most posterior segments. Only the medial field present on the first and the penultimate leg-bearing segment. Ultimate leg-bearing segment (Fig. 3 J and K) Pleuropretergite entire, without sulci. Metatergite subtrapezoidal, wider than long, with lateral margins convex and converging posteriorly. Approximately 22 coxal pores observed on the ventral side of each coxopleuron, most clustered and concealed by the metasternite. Additional pores present dorsally, partly concealed by the metatergite, with some remaining exposed. Metasternite subtrapezoidal, wider than long, anteriorly ca. 1.8 times as wide as posteriorly, with lateral margins slightly convex and converging posteriorly; covered with setae of varying lengths, more densely distributed near the posterior margin. Ultimate telopodite composed of 6 articles, including 2 tarsal articles, ca. 13 times as long as wide and ca. 2 times as long and ca. 2 times as wide as the penultimate telopodite. Tarsus 2 ca. 1.2 times as long as wide and ca. 1.7 times as long as tarsus 1. Setae uniformly dense on most of the ventral and dorsal surfaces of the telopodite, less than 70 μm long. Pretarsus absent, replaced by a small terminal spine. Postpedal segments (Fig. 2 E; Fig. 3 J and K) Male gonopods paired, bi-articulate, situated on either side of the penis and extending posteriorly. Basal article broad; distal article narrower, with a rounded apex. Both articles densely setose, with long setae extending beyond their margins. Penis conical, situated medially between the gonopods. Anal organs not observed. Diagnosis Body length 39–51 mm in males and 65–90 mm in females; number of leg-bearing segments 85–87 in males and 109 in both known females. Head and forcipular segment relatively short; cephalic plate without a transverse suture. Forcipular coxosternite with incomplete chitin-lines. Ventral pore-fields comprising two anterior sublateral fields and one posterior median field on metasternites of leg-bearing segments 2 to the prepenultimate; only the median field present on the first and penultimate leg-bearing segments. Metasternite of the ultimate leg-bearing segment subtrapezoidal and wider than long. Most coxal pores concealed by the metasternite of the ultimate leg-bearing segment. Telopodites of the ultimate legs each bearing a small terminal spine (modified from Tran et al. (2019)). Distribution Vinh Phuc Province, northern Vietnam; China, Hainan Province (Fig. 4).