Iguatonia barboproxima, Jiang & Yi & Xu & Jin, 2025

Iguatonia barboproxima sp. nov.

Figs 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 8 View Figure 8

Diagnosis (larva).

ASE and PL located in posterior half of scutum; ASE and PSE with fine barbs on distal halves; two pairs hypostomalae barbed; ISD 30–42.

Description.

Idiosoma almost oval, with 32 (fD = 32–34 in paratypes) barbed setae, a pair of setae located between scutum and eyes at level with PSE bases (Fig. 5 A View Figure 5 ). Scutum about trapezoid outline with rounded angles, wider than long, anterior margin concave, lateral margins arcuate obviously, posterior margin convex in median and with small concave between bases of PSE (Figs 6 A View Figure 6 , 7 View Figure 7 ). Scutum with three pairs of normal setae (AL, ML and PL) and two pairs of sensilla (ASE and PSE). AL, ML and PL completely barbed, AL slightly shorter than PL, and ML longer than both, PW> MW> AW (Table 3 View Table 3 ). ASE and PSE with setules in distal half, ASE bases posterior to PL bases, PL placed in posterior half of scutum, PSE near posterior border of scutum and longer than ASE (Fig. 6 A View Figure 6 , 7 View Figure 7 ).

Venter. All ventral setae, including coxalae, barbed and with pointed ends (Fig. 5 B View Figure 5 ). Dorsum of coxa I with a peg-like supracoxal seta (elc I) (Fig. 5 C View Figure 5 ). Three pairs of intercoxal setae (1 a, 2 a and 3 a), 1 a posterior to level of posterior edge of coxae I, 2 a between coxae II, and 3 a at a line with anterior edges of coxae III. 2 a and 3 a subequal and both slightly longer than 1 a (Table 3 View Table 3 ). Five pairs of coxalae (1 b, 2 b 1, 2 b 2, 3 b 1 and 3 b 2), 1 b longest, 2 b 1, 3 b 1, and 2 b 2 subequal and all slightly longer than 3 b 2 (Table 3 View Table 3 ). 12 setae behind coxae III (fV = 12 in paratypes).

Gnathosoma (Fig. 6 B View Figure 6 ) with a pair of nude galealae (cs), two barbed anterior hypostomalae (as) and two posterior hypostomalae with barbs on proximal half, bs slightly longer than cs, and both longer than as (Table 3 View Table 3 ). Hypostomal lip fimbriated. Cheliceral bases punctate on the dorsal surface (Fig. 6 C View Figure 6 ). Palpfemur and palpgenu, each with one barbed, pointed dorsal seta. Palptibia with one nude ventral seta, one barbed ventral seta, and one barbed dorsal seta, odontus bifid. Palptarsus with seven setae, three barbed, two nude, one solenidion and one eupathidium. fPp = 0 - B-B- 2 BN 2 -3 B 2 Nωζ. Palpal supracoxal seta (elcp) peg-like.

Legs (Figs 5 B View Figure 5 , 8 View Figure 8 ) with seven segments (femora divided). IP = 2381–2468 (Holotype and three paratypes) (Table 3 View Table 3 ). Anterior and posterior claws hook-like, subequal in length, and anterior claw with few ciliations. Claw-like empodium falciform, longer and slenderer than lateral claws. Normal setae on legs barbed and pointed. Leg setal formula: Leg I: Cx — 1 n; Tr — 1 n; Bfe — 4 n; Tfe — 5 n; Ge — 1 σ, 1 κ, 12 n; Ti — 2 φ, 1 κ, 1 Cp, 18 n; Ta — 1 ω, 1 ε, 2 ζ, 1 Cp, 29 n. leg II: Cx — 2 n; Tr — 1 n; Bfe — 4 n; Tfe — 5 n; Ge — 1 κ, 12 n; Ti — 2 φ, 19 n; Ta — 1 ω, 1 ζ, 30 n. leg III: Cx — 2 n; Tr — 1 n; Bfe — 2 n; Tfe — 5 n; Ge — 12 n; Ti — 1 φ, 19 n; Ta — 1 ζ, 30 n.

Etymology.

The specific epithet of the new species refers to the posterior hypostomalae, which exhibit fine barbs on their proximal half.

Material examined.

Holotype China • a larva ( 2023–1767-CQ-wx ); Chongqing Municipality, Wuxi County, Shuangyang Town ; 31°31'29"N, 109°50'12"E; 1151 m; 30 Jun. 2022; Yan Jiang leg.; from an unidentified nymph of Cicadellidae ( Hemiptera ) GoogleMaps . Paratypes China • two larvae ( 2024–1767-CQ-wx , 2025–1767-CQ-wx ), the same data as the holotype GoogleMaps . China • one larva ( 2026–1768-CQ-wx ); Chongqing Municipality, Wuxi County, Shuangyang Town ; 31°29'28"N, 109°49'44"E; 1132 m; 30 Jun. 2022; Xiao-Li Xu leg.; from an unidentified nymph of Cicadellidae ( Hemiptera ) GoogleMaps .

The holotype and paratypes are deposited in the Institute of Entomology, Guizhou University, Guiyang, China ( GUGC).

Remarks.

To date, two species of Iguatonia have been documented based on larvae, one from Brazil and another one from China ( Haitlinger 2004; Noei et al. 2024; Xu et al. 2020).

Iguatonia barboproxima sp. nov. differs from I. barbillae by the shape of scutum (about trapezoid vs quadrilateral), PL location (in posterior half of scutum vs in anterior half of scutum), ASE location (closer to PL than PSE vs far from PL and near PSE), longer ISD (30–42 vs 10), Ti I (163–167 vs 76–78), and Ti III (246–254 vs 116–126) and differs from I. xinfengi by the shape of scutum (about trapezoid vs sub-rounded), shape of hypostomalae (barbed vs nude), positions of ASE (far from PL and closer to PL than PSE vs almost at the same line with PL), longer ISD (30–42 vs 20–21), Ti I (163–167 vs 114–117), and Ti III (246–254 vs 194–197).