Ismarus similis Kim, Notton & Lee, 2018

Kim, Chang-Jun, Notton, David G., Ødegaard, Frode & Lee, Jong-Wook, 2018, Review of the Palaearctic species of Ismaridae Thomson, 1858 (Hymenoptera: Diaprioidea), European Journal of Taxonomy 417, pp. 1-38 : 28-30

Ismarus similis Kim, Notton & Lee sp. nov.

urn:lsid:zoobank.org:act:D6A239E6-659A-44B5-9C36-757819D3A276

Fig. 6

Diagnosis

In the form of the mesopleuron with its continuous zone of sculpture, Ismarus similis sp. nov. is similar to I. flavicornis . The main difference between these two species (females only) is the mesopleural sculpture, antennal colour and length of median longitudinal furrow on T2: mesopleuron with longitudinal wrinkles, antenna uniformly bright yellowish and T2 with median furrow extending to ¾ of segment in I. flavicornis ; mesopleuron with deep punctures or irregular short wrinkles, antenna not uniformly yellowish and T2 with median furrow not exceeding basal half of segment in I. similis sp. nov.

Etymology

The specific epithet similis is derived from the Latin adjective, meaning similar.

Type material (5 ♀♀)

Holotype

UNITED KINGDOM: ♀, Beds, Flitwick Moor, on Lonicera , 26 Jun. 1984, V.H. Chambers leg. ( NHMUK010265337 ).

Paratypes

UNITED KINGDOM: 2 ♀♀, Beds, Mauldon Wood (reared ex dryinid larva from Iassus sp. on Quercus , host coll., 27 Jul. 1979, wasp em., 6 Jun. 1980), V.H. Chamber leg. (NHMUK010265338, NHMUK010265339); 1♀, Surrey, Barnes Common, 14 Jun. 2009, J.S. Noyes leg. (NHMUK010265340); 1 ♀, Norfolk, Sutton Fen, on Quercus , 18 Jul. 1978, V.H. Chambers leg. (NHMUK010265341).

Description

Female (holotype)

HEAD. Head in dorsal view much wider than long (12: 7), slightly wider than width of mesosoma (12: 10); POL: 6; LOL: 3; OOL: 5 ( Fig. 6B ); ocelli large, LOL as long as diameter of lateral ocellus; vertex behind ocelli nearly flat in lateral view; eye large and without setae; inner orbits, frons and temple with few sparse setae; above antennal sockets, face and cheek with numerous long setae; antenna shorter than body length (4: 5); scape and pedicel with scattered setae; A3–A15 with dense and short setae; antennal segments in following proportions (length: width): 22: 5.5; 10: 4; 17: 3; 17: 4; 14: 4.5; 12: 5; 12: 5.5; 11: 5.5; 11: 5.5; 11:5.5; 11:5.5; 11: 5.5; 11: 5.5; 11: 5.5; 14: 5.5 ( Fig. 6A ).

MESOSOMA. Pronotum in dorsal view punctate with whitish long setae along the posterior margin; pronotal shoulders angled; lateral pronotum predominantly punctate to punctate-rugose except smooth and concave in the middle; mesoscutum smooth and convex; notauli present, with 3 small pits anteriorly ( Fig. 6C ); humeral sulcus finely visible, as long as length of tegula; scutellum smooth and slightly convex, posterior rim rounded ( Fig. 6C ); anterior scutellar pit large and deep, shorter than remaining scutellar disc, median keel present, strongly crenulate at bottom ( Fig. 6C ); mesopleuron with a continuous deep punctures to irregular short wrinkles extending from its anteroventral corner up to meso-metapleural suture ( Fig. 6D ); metapleuron rugose and covered with dense long setae.

WINGS. Fore wing with costal, subcostal, basal, marginal, postmarginal, radial and stigmal veins tubular; medial vein pigmented; radial cell closed, as long as marginal vein and 3.0 × its height ( Fig. 6A ).

LEGS. Fore and mid legs slender; hind tibiae gradually swollen.

METASOMA. Petiole short and expanded (2: 3), strong costae dorsally ( Fig. 6E ); tergites completely smooth, with scattered setigerous punctures; base of second tergite with several short costae basally and long and deep median furrow, extending 0.45 × length of second tergite ( Fig. 6E ); sutures between tergites complete and deeply impressed.

COLOUR. Body black; antennae brown except A1̅A4 yellowish brown; legs yellowish brown; legs yellow except basal part of fore and mid coxae dark brown, hind coxae black; tegulae yellow; wings hyaline, covered with brown setae.

MEASUREMENTS. Head length 0.44 mm, width 0.86 mm; mesosoma length 0.82 mm, width 0.76 mm; metasoma length 1.14 mm; fore wing length 2.00 mm; total body length 2.47 mm.

Variation

Body length 2.47̅ 3.45 mm; antenna brown except A1̅A4 or A1̅A8 yellowish brown; median furrow extending 0.40̅0.50 × length of second tergite in both sexes.

Host

Two specimens in NHMUK labelled as reared ex dryinid larva from Iassus sp. ( Hemiptera : Cicadellidae : Iassinae ) on Quercus sp. An account of the biology is provided by Chambers (1981: as I. halidayi ). Probably this species was attacking Anteon infectum (Haliday, 1837) which Chambers reared from the same Iassus .

Distribution

United Kingdom.

Figures

Fig. 6. Ismarus similis Kim, Notton & Lee sp. nov., holotype, ♀. A. Habitus in lateral view. B. Head in dorsalview.C.Mesosomaindorsalview.D.Head,mesosomainlateralview.E.Petiole,T1indorsalview.