Erromenus tereshkini Kasparyan, 2020

Kasparyan, D. R., 2020, Two new species of the genus Erromenus Holmgren, 1857 (Hymenoptera: Ichneumonidae: Tryphoninae) from the Siberia and Russian Far East, Far Eastern Entomologist 419, pp. 1-8 : 4-7

Erromenus tereshkini Kasparyan , sp. n.

http://zoobank.org/NomenclaturalActs/ 5FC7041B-977F-4D65-B196-611AAA2CB97D

Figs 5–8

MATERIAL EXAMINED. Holotype – ♀, Russia: Zabaikalskiy Territory ,

“Chita Province, Bylyra W of Kyra, steppe slopes and grove, 20. VI 1975, Kasparyan” [“ЧитинскаЯ обл., Былыра W пос. Кыра, степные склоны и колки, 20. VI

1975, КаспарЯн” (about 300 km SW of Chita)] [ ZIN].

DIAGNOSIS. FEMALE. Erromenus tereshkini sp. n. differs from other species with a black body of the zonarius subgroup by rufous apical metasomal segments

6–8 and by rufous fore and mid legs beyond their trochanters; its oral carina raised in a distinct short lobe. It also differs from closely related E. atrator sp. n. but differs in having the basal area and areola longer, and the areola narrowed posteriorly

( Fig. 7 ). In the last character the new species closer to E. zonarius (Gravenhorst) ,

but differs in form of oral carina, colouration of metasoma and in less high upper margin of antennal socket. MALE unknown.

frontal view; 7 – propodeum, dorsal view; 8 – apex of metasoma, lateral view.

DESCRIPTION. FEMALE (holotype). Body length about 7.5 mm. Fore wing

5.8 mm, flagellum 4.6 mm long, 26 flagellomeres. Temples just beyond the eyes slightly convex, in posterior 0.5 roundly narrowed to occipital carina. Upper margin of antennal socket raised as a flange about 0.3 times as high as the scape is wide;

frons in the lower half impressed above the antennal sockets. Face moderately convex, 2.1 times as wide as long, with rather coarse dense punctures centrally,

with fine punctures at lateral sides. Clypeus polished with small sparse punctures at basal 0.33 (up to transversal convexity), its lower edge in median 0.4 obtuse with some short and weak vertical rugae. Clypeal foveae large, deep with fine pubescence,

impressed laterally to malar space; clypeus between foveae separated from face by a strong groove. Malar space short, 0.3 times as long as the basal width of mandible.

Minimal length of the temple 0.5 times as long as the transverse diameter of eye.

Occipital carina sharp to the hypostomal carina. Oral carina raised in moderately high short lobe, 2 times as long as high, and 0.4 times as long as the basal width of mandible.

Pronotum with strong vertical epomia; its lateral portion beyond epomia evenly coarsely punctate. Mesopleuron smooth, in lower half and along anterior margin with rather large moderately dense punctures; its upper corner before subtegular ridge scabrous with rugosity. Mesoscutum on median lobe with rather fine punctures separated in average by 1–2 their diameter; its hind half to prescutellar groove covered with coarse and dense punctures. Mesonotal flange at its posterior margin

0.4 times as wide as tegula. The lateral carina of scutellum extending about 0.5 its length. Scutellum with moderately large sparse punctures, at extreme apex densely punctate.

Propodeum with weak shallow punctures only on first and partly on second lateral areas; merged basal area and areola smooth, 1.0 times as long as maximum width at costulae ( Fig. 7 ). Apical area of the propodeum large, hexagonal, with the strong rugosity and with obscured by rugosity an irregular median vertical carina.

The pleural areas and all three apical areas coarsely rugose.

Fore wing with an oblique areolet; nervulus strongly postfurcal and inclivous;

postnervulus intercepted on lower 0.33. Nervellus in hind wing broken at its lower

0.25. Fore tarsal claws of female densely pectinate to apex, with about 6 teeth;

longest spur in middle tibia 0.85 times as long as its first tarsomere; hind femur 2.7

times as long as wide.

Metasomal terga 1 and 2 respectively 1.0 and 0.55 times as long as wide on posterior margin; tergite 1 with distinctly projecting basolateral corners; its dorsal longitudinal carinae expand to its posterior 0.2. Tergite 2 subpolished, partly with weak traces of smoothened granulation, covered with moderately size rather dense punctures separated in average by 1–2 their diameter; anterior corners of tergite 2

mat, scabrous and cut off by superficial grooves extending from basal third of anterior margin of tergite about to the spiracles; gastrocoeli present at extreme base of the tergite. Tergites 6 and 7 retracted under the previous tergite; their visible hind margin apically with tuft or brush of the setae ( Fig. 8 ). Ovipositor sheath upcurved,

wide, its setiferous part about 0.7 as long a hypopygium; apex of ovipositor sheath almost pointed, its tip with small emargination. Ventral valve of ovipositor projecting beyond tip of dorsal valve about 0.3 times as long as length of setiferous part of sheath.

Body almost entirely black, except for lower 0.7 of clypeus, fore and middle femur and tibiae and tarsi which are rufous yellow; hind femur, tibia and tarsus brownish black, femur partly with reddish brown tinge, tibia with small basal yellow spot, tibial spurs whitish yellow; apical half of tergite 5 and metasomal segments 6–

8 entirely rufous ( Fig. 5, 8 ).

ETYMOLOGY. The species is named in the memory of my friend, Belarusian ichneumonologist Aleksandr Mikhailovich Tereshkin (1953–2020).

Both new species are closely related to the Holarctic species Erromenus zonarius

(Gravenhorst, 1820) and belong to marginatus species group. The species of this group are united by the following features. Areolet present. Clypeal foveae large.

Front tarsal claw of female pectinate almost to apex, of male weakly pectinate at base. Tergite 2 with a pair of shallow oblique basolateral grooves. Tergite 7 of female with median apical brush or tuft of long setae. Ovipositor sheath broad,

beyond apical 0.3 gradually tapered to apex which usually with a shallow oblique emargination (concavity).

The marginatus species group includes two Holarctic ( zonarius Gravenhost, 1820

and punctulatus Holmgren, 1857 ), three Nearctic and five Palaearctic species ( junior

Thunberg, 1822, brunnicans Gravenhorst, 1829 , alpinator Aubert, 1969 , and two new species – atratus sp. n., tereshkini sp. n.). In this group, the author (Kasparyan,

1973) considered two Palaearctic species – analis Brischke, 1871 and bibulus Kasparyan, 1973 , which later have been united with several Nearctic species respectively into the analis and caelator species groups (Townes et al., 1992).

The two new species and E. zonarius are evolutionarily close and can be distin-

guished into a new separate subgroup zonarius . They are united by the characters given in key below.

Figures

Figs. 5–8. Erromenus tereshkini sp. n., ♀, holotype: 5 – habitus, lateral view; 6 – head,