Phanerotomella exilicornis He, Achterberg, He, Tang & Chen, 2025, sp. nov.

Phanerotomella exilicornis sp. nov. urn:lsid:zoobank.org:act: 9155EF2B-0F92-4AF0-A5FD-B2262B9D17C9 Figs 31–32 Diagnosis Scapus and pedicellus in lateral view ivory and distinctly contrasting with dark brown flagellum (Fig. 32D); mesopleuron reticulate and without smooth and shiny area posteriorly (Fig. 32J); lamella of third metasomal tergite not protruding medio-apically (Fig. 32L); clypeus in lateral view less protruding (Fig. 32C); temple distinctly rugulose and matt (Fig. 32C). Etymology Named after its slender antenna; ‘ exilis ’ is Latin for ‘slender’. Type material Holotype CHINA – Hainan • ♀; Shuimanxiang, Wuzhi Mt.; 16–18 May 2007; J. Zeng leg.; ZJUH No. 200807665. Paratypes (2 ♀♀) CHINA – Hainan • 1 ♀; Shuiman, Wuzhi Mt.; 16 May 2007; J. Zeng leg.; ZJUH No. 200705124 • 1 ♀; Yinggeling; 24–25 May 2007; J.X. Liu leg.; ZJUH No. 200702676. Description Female MEASUREMENTS. Length of body 3.0 mm, fore wing 2.6 mm. COLOURATION. Black; head reddish brown and darkened around occipital carina, but face yellowish brown and clypeus yellow; antenna dark brown except for white scapus and pedicellus; mandible yellowish and with reddish teeth; metasoma ventrally white or ivory; fore and middle legs brown except coxa, trochanter and base of tibia white, tarsus pale yellow; hind leg dark brown except base of coxa, trochanter and base of tibia white, tarsus pale yellow; pterostigma and parastigma brown, wing veins pale brown. HEAD (Fig. 32A–C). Width 1.4 × median length in anterior view (Fig. 32B) and part of head above eye in lateral view 0.3 × height of eye (Fig. 32C); antenna with 35+ segments, not widened and only shortened medially, gradually narrowing apically, subapical segments non-moniliform and slightly longer than wide, third, fourth, tenth and fifteenth segments 4.0, 3.7, 1.8 and 1.5× as long as wide in lateral view, respectively (Fig. 32D); area of stemmaticum transversely striate; OOL: OD: POL=35: 11: 8; eye 1.6× as long as temple in dorsal view (Fig. 32A); frons transversely rugulose and with median carina; vertex reticulate-rugose with short setae; temple rugulose and matt; face rugulose and with distinct median ridge, dorsally connected to median carina; clypeus smooth and shiny except for finely punctation, truncate medio-ventrally; eye width in lateral view 1.5× maximum width of temple (Fig. 32C), eye height in anterior view 0.8× minimum width of face (Fig. 32B); malar space rugulose and 1.2× as long as basal width of mandible; mandible rather slender, lower tooth of mandible 0.4× as long as apical tooth (Fig. 32F); face width equal to height of face and clypeus together. MESOSOMA (Fig. 32I–J). Length 1.2× its width in lateral view (Fig. 32J); side of pronotum mainly superficially and finely punctate except anteriorly rugulose; mesoscutum regularly and densely reticulate; notauli absent; scutellar sulcus with six short crenulae (Fig. 32I); scutellum reticulate; mesopleuron densely and regularly reticulate and without smooth and shiny area posteriorly, precoxal sulcus absent; propodeum reticulate, without median carina, with irregular transverse carina connected to four weak and blunt lateral tubercles. WINGS (Fig. 32G–H). Fore wing 2.7× as long as its maximum width (Fig. 32G); second submarginal cell weakly petiolate; vein m-cu weakly postfurcal; vein r, SR1 and 1-SR+M straight; length of 1-R1 1.2 × pterostigma; vein r issued far beyond middle of pterostigma, 1.3× vein r-m; r: 2-SR: SR1 =17: 39: 67; vein 1-CU1 0.4× as long as vein 2-CU1. Hind wing: M+CU: 1-M: 1r-m =28: 40: 12 (Fig. 32H). LEGS (Fig. 32E). Hind femur 3.7× as long as wide; longest spur of hind tibia 0.6 × as long as its basitarsus; hind leg smooth and shiny except fine and superficial punctation; middle tibia without ivory blister. METASOMA (Fig. 32K–L). Oval in dorsal view (Fig. 32K), carapace 1.7× as long as wide and as long as mesosoma; first to third tergites densely reticulate-rugose; third tergite 0.8× as long as second tergite, medial length of third tergite 0.5× its maximum width; lamella of third tergite not protruding medio-apically and with pair of small and blunt tubercles latero-apically (Fig. 32L). VARIATION. Vein m-cu of fore wing weakly antefurcal or interstitial. Male Unknown. Host Unknown. Distribution China (Hainan). Remarks Phanerotomella exilicornis sp. nov. is similar to P. albiscapa (Ashmead, 1905) because of the slender antenna of the female, all flagellum segments are longer than wide and the subapical segments non-moniliform, the posterior ocelli are large and round, and the temple in dorsal view narrows posteriorly. However, P. exilicornis can easily be distinguished from P. albiscapa by the scapus and pedicellus in lateral view being ivory and distinctly contrasting with the dark brown flagellum (antenna brown in the latter), the mesopleuron without a smooth and shiny area posteriorly (with a smooth area in the latter), the lamella of the third metasomal tergite not protruding medio-apically (protruding medio-apically in the latter), and the temple distinctly rugulose and matt (superficially rugulose and shiny in the latter).