Enicospilus tuani, Pham & Pham & Matsumoto & Shimizu & Broad, 2023

Pham, Nhi Thi, Pham, Phu Van, Matsumoto, Rikio, Shimizu, So & Broad, Gavin R., 2023, A review of the genus Enicospilus Stephens (Ichneumonidae: Ophioninae) from Vietnam, with descriptions of ten new species, European Journal of Taxonomy 873 (1), pp. 1-151 : 136-138

Enicospilus tuani sp. nov.

urn:lsid:zoobank.org:act:5D3480D5-2721-47A5-943C-1EA2025B9ECF

Fig. 79

Diagnosis

Interocellar area yellowish brown; clypeus weakly convex, ventral margin acute; mandible short, twisted ca 50°, outer surface without a diagonal setose groove, upper tooth about 1.5 × longer than the lower tooth; fore wing darkened anteriorly, fenestra with proximal, central and distal sclerites present, central sclerite oval, its maximum diameter less than its distance from vein 2r&RS; mesoscutum posteriorly black.

Differential diagnosis

The new species resembles E. acutus Shimizu, 2020 in general colour pattern. It can be recognized from the latter by the less twisted mandible (50° vs 80–85°), longer antenna (63 flagellomeres vs 53–55), smaller AI (0.61 vs 0.98–1.11), greater ICI (0.77 vs 0.46–0.53) and with more hamuli on hind wing vein RA (9 hamuli vs 5–7).

Etymology

Named after Mr Nguyen Van Tuan who collected the holotype specimen.

Material examined

Holotype

VIETNAM • ♀; Gia Lai Province, Kon Chu Rang NP ; 27 May 2019; Nguyen V.T. leg.; light trap; IEBR.

Paratype

VIETNAM • 1 ♀; Quang Nam Province, Tay Giang , TrʼHy ; 10 Jul. 2019; Phan Q.T. leg.; light trap; IEBR.

Description

Female (holotype)

MEASUREMENTS. Body length 25.5 mm, fore wing length 19.6 mm.

HEAD with FI = 0.7, GOI = 2.9 ( Fig. 79d ). Lower face 0.7 × as wide as high, shiny ( Fig. 79b ). Clypeus 1.6× as wide as high, weakly convex in profile, coriaceous, ventral margin acute ( Fig. 79b ). Malar space 0.2× as long as basal mandibular width ( Fig. 79b ). Mandible twisted by ca 50°, moderately long, evenly narrowed, outer surface without diagonal setose groove ( Fig. 79b ). Upper tooth of mandible about 1.5× as long as lower tooth ( Fig. 79b ). Frons and vertex smooth, vertex with sparse setae, gena shiny, with fine setae ( Fig. 79c–d ). Posterior ocellus close to eye ( Fig. 79c ). Occipital carina complete, ventral end meeting hypostomal carina at about 0.9× basal mandible width from base of mandible. Antenna with 63 flagellomeres; F1 1.8× as long as F2; F20 2.4 × as long as wide.

MESOSOMA. Moderately shiny with setae ( Fig. 79e ). Pronotum wrinkled ( Fig. 79e ). Mesoscutum 1.4× as long as maximum width, evenly rounded in profile. Notauli absent. Scutellum strongly convex, punctate anteriorly, with transverse striae medially, posteriorly wrinkled, lateral longitudinal carinae present along entire length of scutellum. Epicnemium matt, densely punctate ( Fig. 79e ). Epicnemial carina moderately strong, dorsal end bent towards and almost reching anterior margin of mesopleuron ( Fig. 79e ). Mesopleuron striate ( Fig. 79e ). Submetapleural carina broadened anteriorly ( Fig. 79e ). Metapleuron strigose ( Fig. 79e ). Propodeum evenly rounded in profile; anterior transverse carina complete; anterior area longitudinally striate; spiracular area smooth; posterior area concentrically striate; propodeal spiracle elliptical and joining pleural carina by ridge ( Fig. 79e ).

WINGS ( Fig. 79f ). Fore wing with AI = 0.61, CI = 0.31, DI = 0.30, ICI = 0.77, SDI = 1.35, SI = 0.14, SRI = 0.19; vein 1m-cu&M sinuate; vein 2r&RS slightly sinuate; vein RS curved; fenestra and sclerites of discosubmarginal cell as in Fig. 79f ; proximal sclerite triangular, not confluent with distal sclerite, strongly pigmented; central sclerite oval, pigmented, positioned in center of fenestra; distal sclerite pigmented; proximal corner of marginal cell evenly setose; posterodistal corner of second discal cell ca 95° and that of subbasal cell ca 90°; vein 1cu-a antefurcal to M&RS by 0.3× length of 1cu-a. Hind wing with NI = 3.8; vein RS slightly curved; vein RA with 9 uniform hamuli.

LEGS. Hind leg with coxa in profile 1.6× as long as high; basitarsus 2.0× as long as second tarsomere; fourth tarsomere 1.8× as long as wide; tarsal claw simply pectinate.

METASOMA. With DMI = 1.4, PI = 2.7, THI = 4.5; thyridium oval; ovipositor sheath not longer than posterior height of metasoma.

COLOUR ( Fig. 79a ). Reddish brown except for apex of mandible, posterior half of mesoscutum, tegula and metasoma from T3 onwards black. Wing darkened anteriorly; sclerites pigmented and amber; veins brown to black, pterostigma black.

Variation in female

Fore wing AI = 0.56, CI = 0.33, ICI = 0.79, SDI = 1.31, SRI = 0.21; hind wing NI = 3.5; face with small black spot mediodorsally.

Male

Unknown.

Distribution

Currently known only from Quang Nam and Gia Lai provinces in South Central and Central Highlands of Vietnam.

Figures

Fig. 79. Enicospilus tuani sp. nov., holotype, ♀ (IEBR). a. Habitus. b. Head, frontal view. c. Head, dorsal view. d. Head, lateral view. e. Mesosoma, lateral view. f. Central part of fore wing. Scale bars = 1.0 mm.