Rhytidaphora thailandica Reshchikov & Quicke, 2022

Reshchikov, Alexey, Quicke, Donald L. J. & Butcher, Buntika A., 2022, A remarkable new genus and species of Euryproctini (Hymenoptera: Ichneumonidae, Ctenopelmatinae) from Thailand, European Journal of Taxonomy 834 (1), pp. 102-116 : 107-110

Rhytidaphora thailandica Reshchikov & Quicke gen. et sp. nov.

urn:lsid:zoobank.org:act:EC8F8A55-E204-45C5-8750-7D26E24078E1

Figs 1–2

Etymology

The specific name refers to the species distribution.

Type material

Holotype THAILAND • ♀; Nan Province, Doi Phu Kha National Park ; 19°12.3′ N, 101°04′ E; 6 Sep. 2019; Malaise trap 5; W. Atsawasiramanee leg.; DNA voucher code CCDB06324-E02; GenBank accession code OK623371 ; CUMZ.

Paratype THAILAND • 1 ♀; Lampang Province, Chae Son National Park , nature trail; 18°50.172′ N, 99°28.38′ E; 507 m a.s.l.; 14–21 Oct. 2007; Malaise trap; B. Kwannui and A. Sukpeng leg., T5315 ; QSBG .

Description

Female (holotype)

MEASUREMENTS. Body length 6.0 mm, fore wing length 6.0 mm, antenna length 7.5 mm.

BODY. Matt and sparsely setose.

HEAD. Antenna slender, as long as fore wing and with 37 flagellomeres. Scape 1.4 times as long as broad. First flagellomere with prominent basal annellus, 1.6 × as long as 2 nd and 1.9 × as long as 3 rd. Head narrowed behind eyes. Clypeus 0.4 times as high as wide, separated from face by distinct groove. Anterior tentorial pit rather large ( Fig. 1B ). Malar space 0.5 times basal mandible width. Inner margins of eyes ( Fig. 1B ) almost parallel, scarcely concave near antennal sockets. Lateral ocellus separated from eye margin by 1.2 times its widest diameter. Face matt with dense setiferous punctures ( Fig. 1B ), with short yellow setosity. Frons with weak curved groove behind antennal sockets; with deep, moderately dense setiferous punctures. Occipital carina broadly incomplete dorsally, joining hypostomal carina shortly before base of mandible. Gena matt, with sparse punctures ( Fig. 2E ).

MESOSOMA. Mesoscutum shining, finely and densely punctate ( Fig. 2C ). Pronotum with crenulate groove only anteriorly, weakly shiny and with fine, moderately dense puncturation. Mesopleuron weakly shiny, setose and without punctures ( Fig. 2E ). Scuto-scutellar groove deep with steep posterior margin, triangular and gradually merging with mesoscutum anteriorly. Scutellum strongly convex, matt, without punctures. Juxtacoxal carina absent. Area superomedia and area apicalis fused, hexagonal ( Fig. 1C ). Spiracles almost round. Wings slightly hyaline ( Fig. 2A ). Fore wing with 1cu-a interstitial. Areolet absent, veins 2m-cu and 2rs-m interstitial. Pterostigma receiving vein Rs+2r at its basal 0.35. 2m-cu with a single, wide bulla anteriorly. Hind wing with cu-a receiving Cu1 well below middle ( Fig. 2A ). Propodeum smooth with strong lamelliform carination. Area basalis short and wide. Posterior transverse carina absent ( Fig. 1C ). Claws pectinate ( Fig. 2B ), fore claw with four teeth, mid- and hind claw with three teeth. Hind femur 4.2 times as long (including trochantellus) as maximally broad. Hind tibia 6.2 times as long as apically broad. First tarsomere of hind leg 8 times as long as broad and 2.5 times as long as second tarsomere.

METASOMA. Without obvious punctures but densely finely setose ( Fig. 2D, F ). T1 as long as broad, with strong dorsal longitudinal carina continuing in dorsal carinae of T2 ( Fig. 2F ). Ventro-lateral carinae complete ( Fig. 2D ). Glymma absent ( Fig. 2D ). S1 rather short, 0.3 times as long as T1. T2 and T3 immovably fused, second suture deep and crenulate ( Fig. 2D, F ). T1‒5 with distinct basal and subapical transverse impressions distinctly striate ( Fig. 2F ). Ovipositor sheath very short, sheaths 0.13 times as long as hind tibia. Ovipositor straight, with a long, shallow, subapical dorsal notch ( Fig. 2D ).

COLORATION. Yellow, except for the following which are marked with black: antenna (dorsally), teeth of mandible, dorsal part of head, pterostigma, hind coxa dorsoapically, hind femur and tibia apically, hind tarsus (except first tarsomere basally), lateral parts of mesoscutum entirely and its anterior medial part, pair of spots on T3 and T4 ( Figs 1–2 ).

Male

Unknown.

Distribution

Thailand.

Molecular analysis

As in the only previous study in which Ctenopelmatinae were relatively well represented ( Quicke et al. 2009), the molecular analysis did not recover any large ctenopelmatine tribes as monophyletic ( Fig. 3 ). The placement of Scolomus within Ctenopelmatinae , even though this genus has been transferred to Metopiinae ( Gauld & Wahl 2006), is consistent with the idea that Metopiinae may be derived from within the Ctenopelmatinae ( Quicke et al. 2009). The Euryproctini as currently constituted were recovered spread across the tree in five separate clades but with low support. Nevertheless, nine of the included euryproctine genera formed a monophyletic grouping ( Fig. 3 , top) including Rhytidaphora gen. nov., and is therefore consistent with the placement of the new genus based on our morphological assessment.

Figures

Fig. 1. Rhytidaphora thailandica Reshchikov & Quicke gen. et sp. nov., holotype, ♀ (CUMZ). A. Habitus, in lateral view. B. Face C. Propodeum.

Fig. 2. Rhytidaphora thailandica Reshchikov & Quicke gen. et sp. nov., holotype, ♀ (CUMZ). A. Wings. B. Tarsal claw.C. Head and mesosoma dorsally.D. Metasoma laterally.E. Head and mesosoma laterally. F. Metasoma dorsally. G. Fore tibia laterally. H. Fore tibia distally.

Fig. 3. Maximum likelihood tree based on a 658 base pair segment near the 5′, terminus of the CO1 gene. This tree includes the new genus plus at least one representative of each genus of Ctenopelmatinae Förster, 1869 with a DNA barcode, plus two tryphonines as outgroups.