Enicospilus circuliscleritalis, 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 : 39-41

Enicospilus circuliscleritalis sp. nov.

urn:lsid:zoobank.org:act:D21A2F3C-3395-4F62-8DE4-6B61F62453EB

Fig. 17

Diagnosis

Interocellar area black; clypeus convex, ventral margin blunt; mandible twisted ca 20°, outer surface without a diagonal setose groove; fore wing marginal cell darkened proximally, fenestra with proximal and distal sclerites present, proximal sclerite moderately large, strongly pigmented, nearly round, separated from vein 2r&RS by less than its maximum width, SDI = 0.7; hind tarsal claws with distal pecten projecting beyond apical tooth.

Differential diagnosis

The new species can be distinguished from E. bakerielli Gauld & Mitchell, 1981 by its black interocellar area (usually testaceous in E. bakerielli but variable), and mandible outer surface without a diagonal setose groove or tuft of long setae. The fore wing of E. circuliscleritalis sp. nov. lacks darkened patches between the proximal and distal sclerites, differing from Vietnamese specimens identified as E. bakerielli (see above, under E. bakerielli ). The new species can be recognized from E. trui sp. nov. by its larger proximal sclerite and the distance from the proximal sclerite to vein 2r&RS less than its maximum diameter, as mentioned in the key.

Etymology

The specific epithet ‘ circuliscleritalis ʼ means ‘circle-shaped scleriteʼ, referring to the nearly round shape of the proximal sclerite.

Material examined

Holotype

VIETNAM • ♂; Cao Bang Province, Trung Khanh, Tra Linh ; 22°45′29.89″ N, 106°17′47.10″ E; 640 m a.s.l.; 17 Oct. 2018; Pham V.P. leg.; light trap; IEBR.

Description

Male (holotype)

MEASUREMENTS. Body length 14.6 mm and fore wing length 9.3 mm.

HEAD with FI = 0.5, GOI = 4.2 ( Fig. 17d ). Lower face 0.7× as wide as high, moderately shiny, densely and finely punctate ( Fig. 17b ). Clypeus 1.4 × as wide as high, convex in profile, finely punctate, except ventral 0.2 smooth, impunctate, ventral margin blunt ( Fig. 17b ). Malar space 0.2 × as long as basal mandibular width ( Fig. 17b ). Mandible twisted by ca 20°, moderately long, evenly narrowed, outer surface without diagonal setose groove ( Fig. 17b ). Upper tooth of mandible about 1.4× as long as lower tooth ( Fig. 17b ). Frons coriaceous, vertex shiny, with sparse setae ( Fig. 17c ). Gena moderately shiny, with dense fine setae ( Fig. 17d ). Posterior ocellus close to eye ( Fig. 17c ). Occipital carina complete, ventral end meeting hypostomal carina at about 0.7 × basal mandible width from base of mandible. Antenna with 52 flagellomeres; F1 1.72 × as long as F2; F20 2.5× as long as wide.

MESOSOMA. Moderately shiny ( Fig. 17e ). Pronotum finely striate ( Fig. 17e ). Mesoscutum 1.4× as long as maximum width, evenly rounded in profile. Notaulus absent. Scutellum moderately convex, punctate anteriorly, with rugae posteriorly, lateral longitudinal carinae present along entire length of scutellum. Epicnemium densely punctate ( Fig. 17e ). Epicnemial carina moderately strong, present on ventral half of mesopleuron, dorsal end bent towards anterior margin of mesopleuron ( Fig. 17e ). Mesopleuron densely punctate dorsally, ventrally puncto-striate ( Fig. 17e ). Submetapleural carina slightly broadened anteriorly ( Fig. 17e ). Metapleuron matt, densely rugose ( Fig. 17e ). Propodeum evenly rounded in profile; anterior transverse carina complete; anterior area punctate; spiracular area smooth; posterior area rugose; propodeal spiracle elliptical and not joined to pleural carina by ridge ( Fig. 17e ).

WINGS ( Fig. 17f ). Fore wing with AI = 1.0, CI = 0.25, DI = 0.47, ICI = 0.21, SDI = 0.7, SI = 0.19, SRI = 0.49; vein 1m-cu&M evenly arcuate; proximal 0.7 of vein 2r&RS strongly sinuate and thickened, abruptly narrowed and straight distally; vein RS strongly curved; fenestra and sclerites of discosubmarginal cell as in Fig. 17f ; proximal sclerite extremely strong, nearly round in shape; distal sclerite strongly pigmented, not connecting to proximal sclerite; proximal corner of marginal cell evenly setose; posterodistal corner of second discal cell ca 90° and of subbasal cell ca 60°; vein 1cu-a antefurcal to M&RS by 0.3 × length of 1cu-a. Hind wing with NI = 3.1; vein RS relatively straight; vein RA with 5 uniform hamuli.

LEGS. Hind leg with coxa in profile 1.6× as long as high; basitarsus 1.9× as long as second tarsomere; fourth tarsomere 2.6× as long as wide; tarsal claws with distal pecten projecting beyond apical tooth.

METASOMA. With DMI = 1.2, PI = 3.1, THI = 5.0; thyridium oval; S4–8 with dense tuft of long setae on posterior margins.

COLOUR ( Fig. 17a ). Reddish brown with many black markings as follows: apex of mandible, median line of face extending ventrally to entire clypeus and dorsally to frons, interocellar area, ventral half of gena and occiput, mesosoma (except prothorax), metasoma from T4 onwards (except a yellow spot on T4 dorsally). Wings hyaline with darkened area at proximal corner of marginal cell, sclerites dark brown, veins reddish brown to dark brown, pterostigma black.

Female

Unknown.

Distribution

Currently known only from the holotype collected in Cao Bang Province, Northeast Vietnam.

Figures

Fig. 17. Enicospilus circuliscleritalis 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.