Enicospilus aequiscleritalis, 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 : 19-21

Enicospilus aequiscleritalis sp. nov.

urn:lsid:zoobank.org:act:F19AB739-65D9-4AF1-93AA-00421899EF8F

Fig. 6

Diagnosis

Interocellar area black; clypeus convex, ventral margin acute; mandible short, twisted 80°–85°, outer surface without a diagonal setose groove; fore wing fenestra with proximal, central and distal sclerites, central sclerite elongate, of nearly similar size and shape to proximal sclerite; mesopleuron puncto-striate to finely striate; metapleuron coriaceous to finely striate.

Differential diagnosis

The new species can be distinguished from E. xanthocephalus Cameron, 1905 by the acute ventral margin of the clypeus, the proximal sclerite joining the proximal margin of fenestra, the larger central sclerite, and the presence of a distal sclerite joining the proximal sclerite.

Etymology

The Latin adjective ʻ aequus ʼ means ʻthe sameʼ. Combined with the sclerite, the specific epithet ʻ aequiscleritalis ʼ referred to the similar size and shape of the proximal and central sclerites.

Material examined

Holotype

VIETNAM • ♀; Hoa Binh Province, Yen Thuy, Lac Thinh ; 15–30 Aug. 2002; Khuat D.L leg.; Malaise trap; IEBR.

Paratypes

VIETNAM • 1 ♀; same collection data as holotype; 1–10 Apr. 2002; IEBR • 1 ♀; same collection data as holotype; 1–10 Sep. 2002; IEBR • 1 ♀; same collection data as holotype; 1–10 Oct. 2002; IEBR • 1 ♀; Hoa Binh Province, Yen Thuy, Da Phuc ; 10–20 Nov. 2003; Khuat D.L. leg.; Malaise trap; IEBR • 1 ♀; same collection data as for preceding; 20–30 Nov. 2003; IEBR • 1 ♀; Hanoi, Chuong My, Thuy Xuan Tien ; 20.8833° N, 105.5765° E; 30 Apr. 2019; Nguyen D.H. leg.; Malaise trap; IEBR .

Description

Female (holotype)

MEASUREMENTS. Body length 11.3 mm, fore wing length 9.8 mm.

HEAD with FI = 0.6, GOI = 3.0 ( Fig. 6d ). Lower face 0.7× as wide as high, moderately shiny ( Fig. 6b ). Clypeus 1.4 × as wide as high, convex in profile, shiny, ventral margin acute ( Fig. 6b ). Malar space 0.3× as long as basal mandibular width ( Fig. 6b ). Mandible twisted by ca 85°, short, strongly narrowed apically, outer surface without diagonal setose groove ( Fig. 6b ). Upper tooth of mandible about 1.2 × as long as lower tooth ( Fig. 6b ). Frons and vertex shiny, gena shiny with fine setae ( Fig. 6c ). Posterior ocellus close to eye ( Fig. 6c ). Occipital carina complete, ventral end meeting hypostomal carina at about 0.7× basal mandible width from base of mandible. Antenna with 43 flagellomeres; F1 1.7× as long as F2; F20 2.2 × as long as wide.

MESOSOMA. Moderately shiny ( Fig. 6e ). Pronotum finely striate medially ( Fig. 6e ). Mesoscutum 1.5 × as long as maximum width, evenly rounded in profile. Notaulus absent. Scutellum moderately convex, shiny with small punctures anteriorly, posteriorly with several rugae, lateral longitudinal carinae present along entire length of scutellum. Epicnemium matt, densely punctate ( Fig. 6e ). Epicnemial carina moderately strong, present on ventral half of mesopleuron, dorsal end weakly bent towards anterior margin of mesopleuron ( Fig. 6e ). Mesopleuron finely striate ventrally, dorsally finely punctate ( Fig. 6e ). Submetapleural carina broadened anteriorly ( Fig. 6e ). Metapleuron finely striate dorsally ( Fig. 6e ). Propodeum evenly rounded in profile; anterior transverse carina complete; anterior area shiny, with several rugae; spiracular area smooth; posterior area with concentric fine striae; propodeal spiracle elliptical and joining pleural carina by ridge ( Fig. 6e ).

WINGS ( Fig. 6f ). Fore wing with AI = 1.5, CI = 0.33, DI = 0.43, ICI = 0.31, SDI = 0.97, SI = 0.26, SRI = 0.30; vein 1m-cu&M strongly arcuate; vein 2r&RS weakly sinuous; vein RS strongly curved; fenestra and sclerites of discosubmarginal cell as in Fig. 6f ; proximal sclerite elongate, strongly pigmented, confluent with weak distal sclerite; central sclerite elongate, positioned at posterodistal area of fenestra; proximal corner of marginal cell evenly setose; posterodistal corner of second discal cell ca 85° and of subbasal cell ca 90°; vein 1cu-a interstitial to M&RS. Hind wing with NI = 2.1; vein RS straight; vein RA with 5 uniform hamuli on right wing and with 6 uniform hamuli on left wing.

LEGS. Hind leg with coxa in profile 1.6× as long as high; basitarsus 1.9× as long as second tarsomere; fourth tarsomere 2.2× as long as wide; tarsal claw with proximal pecten longer than distal ones.

METASOMA. With DMI = 1.3, PI = 2.7, THI = 3.6; thyridium oval; ovipositor sheath not longer than posterior height of metasoma.

COLOUR ( Fig. 6a ). Reddish brown except for apex of mandible and interocellar area black, and metasoma from T5 onwards brown. Wings hyaline; sclerites pigmented and amber; veins dark brown, pterostigma reddish brown.

Variation in female Antenna with 43–45 flagellomeres. Fore wing length 7.7–11.0 mm, AI = 1.55–2.38, CI= 0.26–0.33, DI = 0.42–0.46, ICI = 0.26–0.34, SDI = 1.02–1.09, SI = 0.23–0.26, SRI = 0.32–0.33. Hind wing with NI = 1.70–2.50. Mesosoma with mesoscutum entirely reddish brown sometimes with blackish marking in front of scuto-scutellar groove. Metasoma from T5 onwards brown to black.

Male

Unknown.

Distribution

Currently known from Hoa Binh Province in the northwest and Hanoi City in the Red River Delta of Vietnam.

Figures

Fig. 6. Enicospilus aequiscleritalis 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 = 0.5 mm.