﻿Two new species of the Phaoniaboleticola-group (Diptera, Muscidae, Phaoniinae) from China

﻿Abstract Two new species of Phaonia are described: Phaoniaagitata Zhou & Wei, sp. nov. and Phaonianujiangensis Zhou & Wei, sp. nov., which were collected from Guizhou and Yunnan provinces of southwestern China and are assigned to the boleticola-group. A key to the species of this group is provided. The type specimens are deposited in the Wei Lianmeng Model Worker Innovation Studio, Anshun, Guizhou, China (WLMWISAGC).


Introduction
The genus Phaonia Robineau-Desvoidy, 1830 with the important synapomorphy -1 strong pd (calcar) present at apical 1/4 of hind tibia -is one of the largest genera of Muscidae, mainly distributed in Palaearctic and Oriental regions (Sorokina 2015).So far, some 806 species are known from the world and nearly half of them are described from China (Xue et al. 2014).The first author to identify groups in Phaonia was W. Hennig who established 18 groups of species in his Palaearctic monograph, including the boleticola species-group with four species (Hennig 1963).To date, 39 species groups are known worldwide, which are based only on external characters (Ma et al. 2002;Xue et al. 2008).However, there is at present a lack of reliable phylogenetic evidence, and so there may be a need to erect additional species groups.In the boleticola species-group, 10 species have been recorded worldwide, all distributed in the Palearctic region except for hainanensis which occurs in the Oriental region, and seven species have been reported from China (Xue et al. 2008).During the identification of specimens collected from Guizhou, Sichuan and Yunnan provinces in Southwest China, two species of the boleticola-group from Guizhou and Yunnan were identified as new to science.
This paper is a result of the study of specimens deposited in the Wei Lianmeng Model Worker Innovation Studio, Anshun, Guizhou, China (WLMWISAGC) and is part of on-going studies on the genus Phaonia from Guizhou, Sichuan and Yunnan provinces of southwestern China.A key to all seven species of the P. boleticola species-group from China is provided.
Diagnosis.Members of the P. boleticola species-group have the following combination of characters: frons narrow, arista plumose, presutural acr 0, pra undeveloped, prosternum bare, scutellum and abdomen dark, mid tibia with a row of p or pv only, hind tibia without apical pv.Except as noted above, the authors find the male terminalia of the P. boleticola species-group to have the following characters: viewed posteriorly, cerci usually vest-like, fused proximally on upper 1/2 to 3/5, or even nearly completely fused.
Remarks.Both P. xuei Wang & Xu, 1998 and P. fani Ma & Wang, 1992 (only females known) are different from other members of the P. boleticola species-group in the following features: abdomen not entirely black, tg 1+2 and most of tg 3 pale yellow; tg 4 and 5 each with hind marginal band yellow; male cercus of P. xuei rounded, which is very different from that of other species of the P. boleticola species-group.Therefore, these two species probably do not belong to the P. boleticola species-group or the definition of the P. boleticola species-group needs to be studied further and modified.
Head with eye bare, anterior inner facets distinctly enlarged.Frons somewhat wider than the space between outer margin of two posterior ocelli.Frontal vitta black, devoid of pruinosity, about as wide as facial ridge.Fronto-orbital plate dark, densely silver-grey pollinose.Frontal setae 5 pairs, mixed with individual setulae, uppermost one as weak as setulae, the distance from this to anterior ocellus about 1.5 times the space between outer margin of two posterior ocelli.Lunule darkish tawny-yellowish, silver-grey pollinose.Antenna brownish-yellow, postpedicel brownish apically, scape and pedicel brown; postpedicel about 2.3 times as long as pedicel or about 3.3 times as long as wide.Arista brownish-yellow, thickened basally, with long plumosity, the longest rays about as long as width of postpedicel.Face and facial ridge mainly black, more or less yellowish, brown-grey pollinose.Lower facial margin not protruding in profile.Genal groove dark red dark, almost without pruinosity.Gena black, brown-grey pollinose, about 0.18 times of eye height or equal to 1.5 times width of postpedicel, its anterior margin with a row of upcurved setae.Palpus rod-like, black, longer than haustellum.Prementum stout, brown, thinly grey pollinose.Labellum developed, dark red.Occiput black, grey pollinose, with dark setae.
Wing with veins brown to dark brown.Tegula and basicosta black.Costal spine undeveloped, clearly shorter than cross-vein r-m.C setulose ventrally, but 5 th section bare.Radial node bare dorsally and ventrally.Cross-veins r-m and m-m without much clouding and the latter curved.Distal part of R 4+5 curved up and M straight and both of them gradually diverging towards apex.Calypters yellow, lower one narrow, tongue-shaped, with distal margin round, inner margin separated from scutellar margin.Haltere reddish-yellow.
Legs.Fore tibia with a median p. Mid femur with a row of short and dense a on basal half, a row of setula-like av and pv, without ad; apically with 2 ad and 3 pd.Mid tibia with 2 p. Hind femur with a row of developed ad, 6 av at apex and a row of setulae-like pv; apically with 2 ad, 1-2 pd and 1 p.Hind tibia with 3 av, proximal one developed, 1 strong pd (calcar) present at apical 1/4, without apical pv.
Female.Unknown.Measurements.Male.Body length 6.9-7.0 mm.Etymology.The Latin agitatus means "agitated", which refers to the excitement that the authors experienced when involved in fieldwork activity.
Remarks.The new species resembles P. hainanensis Xue et al. and these two species belong to the P. boleticola-group because they share the following characters: legs partly yellow, dc 2+3, meron bare, abdomen with a black median vitta and without a shining patch.It can be separated from the latter by the following combination of features: frons somewhat narrower than 2.5 times anterior ocellus, antenna brownish-yellow; male terminalia: in posterior view, cercus is wider, with distal outer angle dully rounded; in profile, surstylus short, with apex widened; st5 with apical angle of lateral lobe never expanded outwards when viewed ventrally.In P. hainanensis, the antenna is yellow; the cercus is narrower, with the distal outer angle acute; surstylus elongated, with apex narrow; st5 with apical outer angle strongly expanded outwards.
This new species is also similar to P. nujiangensis sp.nov.but can be separated from the latter as follows: Frons somewhat wider than the space between outer margins of posterior ocelli; katepimeron setulose; both anterior and posterior spiracles brown; legs dark brown, tibiae yellow-brown; mid tibia with 2 p, hind tibia with 3 av.Male terminalia: Cercus as long as wide.Surstylus spherical, swollen apically, shorter in profile.St5 (Fig. 3) oval, apical angle of lateral lobe curved inwards.Aedeagus with acrophallus triangular, membranous (Fig. 4).
Diagnosis.Eye bare, frons black, somewhat narrower than the space between outer margin of two posterior ocelli; antenna brownish-yellow, gena black-red, grey pollinose, about 0.1 times eye height or narrower than width of postpedicel; dc 2+3, both anterior and posterior spiracles pale yellow, katepimeron bare; legs yellow, fore femur brownish-black, mid and hind femora each with apex somewhat darkened dorsally; tarsus black, somewhat brownish, mid tibia with 3 p, hind tibia with 2av.Male terminalia: Viewed posteriorly: Cerci nearly completely fused in approximated portion.Apex of surstylus square-shaped and swollen.Viewed laterally: Cercus nearly hooked, the hind margin flexed at a right-angle.Surstylus strap-like, base strongly and apex slightly widened, apex bluntly rounded and hind margin curved posteriorly.St5 almost jar-shaped, apical angle of lateral lobe narrow, not curved inwards.Aedeagus with a small oval membranous area apically; acrophallus tail-shaped, membranous.Ejaculatory apodeme long, narrowly triangular.
Head.Eye bare, anterior inner facets distinctly enlarged.Frons black, somewhat narrower than the space between outer margin of two posterior ocelli.Frontal vitta devoid of pruinosity, completely disappeared at narrowest point.Fronto-orbital plate densely silver-grey pollinose.Frontal setae 6 pairs, upper two as weak as setulae, distributed on more than anterior half.Lunule darkish red-brown, silver-grey pollinose.Antenna brownish-yellow, postpedicel dark brownish apically, scape and pedicel darkish red-brown; postpedicel about 2.4 times as long as pedicel and also about 2.4 times long as wide.Arista darkish brown, thickened basally, long plumose, the longest rays as long as width of postpedicel.Facial ridge and median area black, silver-grey pollinose, the former less than half as wide as antennal width.Face bright black, thinly grey pollinose; facial ridge black but bright black along upper margin along a narrow strip, which is also thinly grey pollinose.Lower facial margin not protruding in profile.Gena black-red, grey pollinose, about 0.1 times eye height or narrower than postpedicel width, its anterior margin with a row of upcurved setae.Palpus rod-like, brownish-black, longer than haustellum.Prementum stout, dark brown, thinly grey pollinose.Labellum developed, dark yellow.Occiput black, grey pollinose, with dark setae.
Wing brownish-yellow, veins yellow to dark brown.Tegula blackish-brown, basicosta brown.Costal spine developed, obviously longer than cross-vein r-m.C setulose ventrally on 1 st to 3 rd sections and basal half of 4 th sections.Radial node bare dorsally and ventrally.Cross-veins r-m and m-ms lightly clouded and the latter curved.Distal part of R 4+5 and M straight, both somewhat diverging towards apex but parallel at apex.Calypters yellow, the lower one narrow, tongue-shaped, with distal margin round and inner margin separated from scutellar margin.Haltere yellow.
Legs yellow, fore femur brownish-black, mid and hind femora somewhat darkish dorsally at apex; tarsus black, somewhat brownish.Fore tibia with a median developed p.Mid femur with a row of short and dense a on basal half, with 3 spine-like av, very short, without pv; apically with 2 ad and 3 pd.Mid tibia with 3 p, developed.Hind femur with a row of developed ad, 2 av at apex, proximal one developed, apically with 2 d, 1 pd.Hind tibia with 2 av, proximal one developed, 1 strong pd (calcar) present at apical 1/4, without apical pv.
Abdomen elongate conical, reddish-brown, thinly grey-brown pollinose.Tg3-5 with a dark median vitta, that on Tg5 very narrow and blurred at edges.Tg5 dark redbrown apically.St1 bare.Male terminalia: Viewed posteriorly (Fig. 6): Cerci vest-like, nearly completely fused in approximated portion and obviously invaginated at apex, apical outer angle bluntly rounded; inner angle with an apical seta.Apex of surstylus square-shaped and swollen.Viewed laterally (Fig. 7): Cercus nearly hooked, the hind margin flexed at a right-angle.Surstylus strap-like, moderately elongated, base strongly and apex slightly widened, apex bluntly rounded and hind margin curved posteriorly.St5 (Fig. 8) almost jar-shaped, apical angle of lateral lobe narrow, not curved inwards.Hypandrium (Fig. 10) meniscate, with deep median incision posteriorly.Genital tergite (Fig. 9): Pregonite slender, flexed from the middle, basal half curved cone-like, apical half strap-shaped, rounded apically.A pair of asymmetric postgonites, rather developed; the left one apparently smaller than the right one, base trapezoid and end curved, with 3 ventral setae medially; the right one wide strap-shaped, straight, rounded apically, with 4 ventral setae near the middle and 2 median setae.Distiphallus elongated, the base strap-shaped, well sclerotized, with a small oval membranous area apically.Acrophallus tail-shaped, membranous.Aedeagal apodeme slender, sclerotized apex expanded like a fan and wrapped round with a membranous plate.Epiphallus developed, rod-shaped, with apex expanded like a fan.Ejaculatory apodeme (as in Fig. 9) long, narrowly triangular.
Remarks.The new species resembles P. hainanensis Xue et al., but this species differs from the new species by the yellow antenna; cerci narrower, with distal outer angle acute; surstylus elongated, with apex narrow; St5 with apical angle of lateral lobe not curved inwards.Furthermore, the new species is similar to P. agitata sp.nov.but can be separated from the latter by the following characters: frons somewhat narrower than the space between outer margin of two posterior ocelli; katepimeron bare; both anterior and posterior spiracles pale yellow; legs yellow, fore femur brownish-black; and male terminalia has different morphological characteristics from that of P. hainanensis.