Lathrolestes oelandinus, Reshchikov, Alexey, 2015

Reshchikov, Alexey, 2015, Review of North European species of the genus Lathrolestes (Hymenoptera, Ichneumonidae) with description of one new species from Öland (Sweden), Zootaxa 4033 (1), pp. 1-47 : 13-15

Lathrolestes oelandinus sp. nov.

Figs. 24 , 36, 37, 43–48.

Material: Holotype: 1♀, SWEDEN, Öland, Mörbylånga kommun, Gamla Skogsby (Kalkstad), "diversitetsängen", Meadow with bushes, N56°37.002´E16°30.457´(=TrapID 22), 01.vi–15.vi.2005 (=coll. event ID 1313), leg. SMTP, NHRS-SMTP14340001, NHRS; Paratypes: 4♀, 4♂, the same as in holotype, NHRSSMTP 14340002-9, NHRS; 4 ♂, SWEDEN, Öland, Mörbylånga kommun, Gamla Skogsby (Kalkstad), "diversitetsängen", Meadow with bushes, N56°37.002´E16°30.457´(=TrapID 22), 20.v–01.vi.2005 (=coll. event ID 1312), leg. SMTP, NHRS-SMTP143400010-13, NHRS; 1♀, 1♂, SWEDEN, Öland, Mörbylånga kommun, Gamla Skogsby (Kalkstad), "diversitetsängen", Meadow with bushes, N56°37.002´E16°30.457´(=TrapID 22), 20.v–28.vi.2006 (=coll. event ID 1725), leg. SMTP, NHRS-SMTP13120001-2, NHRS; 15 ♂, the same collecting event, NHRS-SMTP13120003-16, SMTP.

Diagnosis. This species differs from other species of the genus by the following character states: 1) occipital carina complete, 2) head slightly narrowed behind eyes ( Fig. 47 ), 3) propodeum without carinae, 4) ovipositor longer than metasoma, curved, upper valve with nodus and without subapical dorsal notch at apex; lower valve with distinct teeth at apex ( Figs. 36 , 43 ), 5) female with yellow-reddish orbits on sides from frons, maculae around clypeal fossae and temple, and reddish-brown hind margins of metasomal tergites ( Fig. 43 ).

Description. Female ( Fig. 43 ). Body length 3.5 mm. Antenna with 24 flagellomeres. Scape 1.75 × as long as broad.

Head narrowed behind eyes, matt. Maximum length of temple equal transverse eye diameter; minimum length of temple 0.7 × transverse eye diameter. Face as broad as 0.8 × eye height, rather convex, bulging ( Fig. 45 ). Clypeus distinctly separated from face, at apex projecting anteriorly; apical margin of clypeus thick. Clypeal fovea small. Malar space 0.6 × basal mandible width. Occipital carina medially complete. Lower mandible tooth longer than upper.

Mesosoma matt, without punctures. Notaulus shallowly impressed at base. Mesopleuron impunctate, granulated. Claws pectinate ( Fig. 24 ). R intercepting pterostigma just before its middle. Areolet not petiolate. 2mcu with single bulla. Nervulus slightly postfurcal. Hind wing with cu-a intercepted by Cu1 below middle. Propodeal carinae absent.

Metasoma slightly shining, impunctate ( Fig. 48 ). First metasomal tergite 1.1 × as long as broad apically, rather convex, without longitudinal dorsal carinae and medial impression ( Fig. 48 ). Second metasomal tergite transverse, trapezoidal. Following tergites also transverse. Ovipositor longer than metasoma, slightly curved upwards with nodus and preapical ventral teeth ( Figs. 36 , 45 ).

Colour ( Figs. 43 , 45, 48 ). Face (except maculae under antennal sockets and around clypeal fovea), front (except orbits), temple partly and occiput completely, pronotum (except upper hind edge), mesoscutum, mesoscutellum, mesopleurae (except upper fore edge), propodeum, first metasomal tergite, hind coxae entirely and middle coxae basally black. Antennal flagellum (except basal flagellomeres ventrally), clypeus, tips of mandibles, malar space, pterostigma, basal part of metasomal tergites 2–7 dark brown. Apical part of clypeus and metasomal tergites 2–7, tarsi reddish-brown. Scape, pedicellus, basal flagellomeres ventrally, maculae under antennal sockets and around clypeal fovea, orbits on sides from frons, upper anterior and lower anterior parts of temple, legs (except basal part of middle coxae and entire hind coxae) reddish-yellow. Tegulae and closed edges of pronotum and mesopleuron whitish.

Male. Essentially as in female except as follows: first metasomal tergites 1.7 × as long as broad. Parameres broad medially ( Fig. 37 ).

Colour (Figs. Figs. 44 , 46, 47 ). Face, temple, mandible except its tips, scape, pedicellum, flagellomeres ventrally, propleuron, hind part of pronotum close to tegulae and fore coxae, bands on mesoscutum in front of tegulae, top of scutellum, fore edge of mesopleuron, trochanters, fore coxa completely and middle and hind coxae apically yellow. Femora, tibiae, sternites and hind margins of metasomal tergites 2–7 laterally, parameres yellowreddish. Tarsi reddish-brown. Occiput, pronotum, mesoscutum, mesopleuron, propodeum and first metasomal tergite black. Flagellomeres dorsally, middle and hind coxae, metasomal tergites dark brown.

Comments. Ovipositor structure similar to ovipositor of L. ensator , elongated and curved upwards ( Fig. 35 ), an adaptation to hunt for larvae inside fruits. Lathrolestes oelandinus sp. nov. was collected in Gamla Skogsby, Öland on a meadow with shrub vegetation. It is likely this species is a parasitoid of carpophagous sawflies with small body size. The type locality has a lot of remains of human settlement from the past centuries ( Rasch & Ring, 2009). I recognized different species of Rosaceae when I visited the place for collecting.

Distribution. Sweden.

Etymology. The species epithet refers to Öland.

Figures

FIGURES 18–27. Claws. 18, L. bipunctatus; 19, L. clypeatus; 20, L.buccinator; 21, L. ensator; 22, L. luteolator; 23, L. nornae; 24, L. oelandinus; 25, L. erythrocephalus; 26, L. orbitalis; 27, L. kozlovi.

FIGURES 45 – 48. Lathrolestes oelandinus sp. nov. 45, female face; 46, male face; 47, male head dorsally; 48, female metasoma dorsally.

FIGURES 30 – 36. Types of ovipositor of Lathrolestes. 30, L. luteolator, with shallow notch before apex, stout at base; 31, L. clypeatus, with shallow notch before apex, curved upwards; 32, L. bipunctatus, stout in basal half, with gradually narrowing apical half, without shallow notch before apex; 33, L. luteolus, thin, gradually narrowing towards apex; 34, L. orbitalis, swollen dorsally, without notch; 35, L. ensator; 36, L. oelandinus sp. nov., elongate, curved upwards, without notch, with nodus and apical teeth.

FIGURES 43 – 44. Habitus views of Lathrolestes oelandinus sp. nov.; 43, female; 44, male.

FIGURES 37 – 42. Types of male genitalia of Lathrolestes. 37, L. oelandinus sp. nov.; 38, L. buccinator; 39, L. caudatus; 40, L. citreus; 41, L. verticalis; 42, L. tripunctor.