Foenobethylus yunkaishanensis Chen & Luo, 2022

Li, Yang, Wang, Zheng, Chen, Hua-Yan & Luo, Shi-Xiao, 2022, Integrated taxonomy unveils three new species of Foenobethylus (Hymenoptera, Bethylidae) from China, Journal of Hymenoptera Research 89, pp. 89-108 : 89

Foenobethylus yunkaishanensis Chen & Luo sp. nov.

Figures 6 , 7

Diagnosis.

Male. Head rectangular and elongate (Fig. 6B ). Clypeus with median lobe truncate, median carina incomplete, not reaching anterior clypeal margin, but high and straight in lateral profile. Eye glabrous (Fig. 6B ). Distance between posterior margin of compound eye and occipital carina longer than length of compound eye in dorsal view. Notaulus converging posteriorly, almost complete except the apex (Fig. 6C ). Metatrochanter without spine (Fig. 7G ). Metafemur with acute spine in ventral midline, proximal one 0.35 × as long as metafemoral width, touching apical margin of metatrochanter, distal one 0.14 × metafemoral width, located on basal two fifth of metafemur (Fig. 7G ). Posterior hypopygeal margin strongly incurved, lateral lobe with conical protuberance (Fig. 7E ). Basivolsella large, 0.6 × as long as gonostipe, basal half distinctly wider than apical half, basal margin incurved (Fig. 7C, D ).

Description.

Male holotype. Body length 3.14 mm. Forewing length 2.08 mm. Colors. Head, mesosoma, metasoma, base of scape, all flagellomeres, apical half of mesotibia and metatibia, all trochanter, and claws dark castaneous; apex of scape, pedicel, palpi, protibia, basal half of mesotibia and metatibia, and tarsi castaneous; wings subhyaline.

Head. Head (Figs 6B , 7A ) rectangular and elongate, 1.2 × as long as wide. Mandible with five apical sharpened teeth, posterior tooth largest, middle three teeth smaller, anterior tooth smallest. Clypeus with median lobe truncate, median carina incomplete, not reaching anterior clypeal margin, but high and straight in lateral profile. Eye glabrous, almost touching mandible base at anterior corner. Malar space reduced. Frons very weakly coriaceous, almost polished, punctures very sparse and small. WH 0.86 × LH. WF 0.61 × WH. WF 1.19 × HE. OOL 1.20 × WOT. Frontal angle of ocellar triangle obtuse. Anterior ocellus far posterior to supra-ocular line. Temple divergent anterad, corner rounded. Vertex badly outcurved. First four antennomeres in ratio of about 21:8:8:7 (Fig. 6E ). All flagellomeres distinctly longer than wide, pubescence erect, about 0.67 × as long as flagellomeral width. Maxillary palpus with five palpomeres (Fig. 7A ). Labial palpus with two palpomeres (Fig. 7A ). Occipital carina complete. Medioccipito-genal carina complete. Hypostomal carina thick, almost straight, not angled medially.

Mesosoma (Figs 6C, D , 7B ). Mostly polished and weakly coriaceous. Pronotal flange short, exposing propleuron dorsally. Dorsal pronotal area short, without anterior carina strongly progressively narrowing anterad, lateral surface concave. Notaulus converging posteriorly, almost complete except the apex, deep, distinct, and progressively more evident posteriorly. Parapsidal signum sinuous, absent anteriorly. Mesoscutellum shorter than anteromesoscutum. Mesoscutum-mesoscutellar sulcus deep, arched, sides wider than middle. Metanotum conspicuous, metascutellum wide and short, metanotal trough trabeculate, metanotal fovea outlined. Metapectal-propodeal disc polished, metapostnotal median carina incomplete, absent posteriorly, lateral and transverse posterior carinae complete; propodeal spiracle circular, located on lateral surface of propodeum, ventral to lateral carina. Propodeal declivity transverse sculptured, and without median carina. Mesopleuron with mesopleural pit large and well defined. Pleurosternum small, triangular, with vertex directed posterad. Prepectus with epicnemial medial projection complete, posterior prepectal flange thick. Wings (Fig. 6F ). Forewing with three closed cells (Costal, Radial and First Cubital); pterostigma about 0.3 × as wide as long, anterior board outcurved; 2r-rs&Rs sector vein long; Rs&M reaching Sc+R far from pterostigma. Hind wing with one straight hamulus, and four distal hamuli equally distant, and strongly curved. Legs. Profemur swollen, 2.6 × as long as wide, apical half of ventral margin serrulate. Metatrochanter (Fig. 7G ) without spine. Metafemur (Fig. 7G ) with acute spine in ventral midline, proximal one 0.35 × as long as metafemoral width, touching apical margin of metatrochanter, distal one 0.14 × metafemoral width, located on basal two fifth of metafemur.

Metasoma. Much longer than mesosoma. Seventh sternite (Fig. 7F ) with posterior margin incurved at middle third. Hypopygium (Fig. 7E ) with spiculum much longer than median length of hypopygium, and 1.2 × longer than anteromedial apodeme, latter distinctly curved mesad apically; posterior margin strongly incurved, lateral lobe with conical protuberance. Genitalia (Fig. 7C, D ). Harpe shorter than gonostipe; aedeagus wide, 1.93 × as long as wide, apex aedeagus posterior to posterior margin of gonostipe, 0.65 × as long as gonostipe; basivolsella large, 0.6 × as long as gonostipe, basal half distinctly wider than apical half, basal margin incurved.

Variation.

Body size maller and color lighter.

Etymology.

The specific epithet refers to the locality (Mt. Yunkaishan) where the type specimens were collected.

Material examined.

Holotype, male, China: Guangdong Yunkaishan National Nature Reserve , 1480 m, 22°17'40.72"N, 111°12'37.97"E, 29.v-4.vii.2020, MT, Long-long Chen, SCAU 3048315 (deposited in SCBG) . Paratypes: 2 males. 1 male, China: Guangdong Yunkaishan National Nature Reserve , 22°16'22.67"N, 111°11'38.7"E, 30.vi-23.vii.2020, MT, Long-long Chen, SCAU 3042639 (SCBG) ; 1 male, China: Guangdong Yunkaishan National Nature Reserve , 22°17'40"N, 111°12'37.97"E, 1480 m, 9.v-4.vii.2020, MT, Long-long Chen, SCAU 3042658 (SCBG) .

Distribution.

Oriental region, China, Guangdong Province.

Remarks.

This new species is very similar to F. bidentatus Várkonyi & Polaszek [Brunei, Thailand], but can be separated from the latter by the following characters: distance between posterior margin of compound eye and occipital carina longer length of compound eye in dorsal view (as long as in F. bidentatus ); seventh sternum with distal margin strongly emarginated (narrowly emarginated in F. bidentatus ); posterior margin of hypopygium strongly incurved (broadly and almost evenly emarginate in F. bidentatus ).

Figures

Figure 6. Foenobethylus yunkaishanensis Chen & Luo, sp. nov., male, holotype (SCAU 3048315) A lateral habitus B head, dorsal view C mesosoma, dorsal view D mesosoma, lateral view E antenna F wings.

Figure 7. Foenobethylus yunkaishanensis Chen & Luo, sp. nov., male A, B, G holotype (SCAU 3048315), C-F paratype (SCAU 3042639) A head, ventral view B mesosoma, ventral view C genitalia, dorsal view D genitalia, ventral view E subgenital plate F 7 th sternite G metaleg, lateral view.