Idris curtus Johnson & Chen

Johnson, Norman F., Chen, Huayan & Huber, Bernhard A., 2018, New species of Idris Foerster (Hymenoptera, Platygastroidea) from southeast Asia, parasitoids of the eggs of pholcid spiders (Araneae, Pholcidae), ZooKeys 811, pp. 65-80 : 65

Idris curtus Johnson & Chen sp. n. Figures 4, 8, 12

Description.

Body length: 0.83-0.89 mm. Head color: brown. Mesosoma color: brown. Metasoma color: brown

Head shape in frontal view: ovoid, distinctly wider than high. Head width/mesosomal width: 1.20-1.27. Sculpture of upper frons, vertex: finely coriaceous reticulate. Position of lateral ocellus: contiguous with inner orbit of compound eye. Central keel of frons: present. Length of central keel of frons: extending dorsally half distance to median ocellus. Speculum: present. Striae on lower frons: with short striae flanking speculum. Setation of compound eyes: eyes distinctly setose.

Size of A3: distinctly smaller than A2. Shape of A3: length greater than width.

Length/width mesoscutum: 0.65-0.79. Sculpture of mesoscutum: finely reticulate, setal bases pustulate. Notauli: absent. Sculpture of mesoscutellum: finely reticulate, setal bases pustulate. Sculpture of metascutellum: smooth. Propodeal armature: lateral propodeal area produced dorsomedially into small tooth.

Wing development: fully developed, macropterous. Fore wing patterning: fore wing hyaline throughout. Marginal fringe of fore wing: present, short. Length of bristles on submarginal vein: short, barely reaching beyond costal margin of wing. Basal vein: well-defined, straight, lightly pigmented. Length of stigmal vein: elongate, extending nearly to middle of fore wing. Length of postmarginal vein: extremely short, subequal in length to marginal vein.

Metasoma length/body length: 0.52-0.57. Sculpture of T1: longitudinally costate. Sculpture of T2: longitudinally costate in medial third, finely reticulate along lateral margin, elsewhere smooth. Length T3/length T2: 1.87-2.33. Sculpture of T4-T5: finely reticulate basally, smooth apically. Setation of T3: lateral thirds of tergite moderately setose through, median third nearly glabrous, with sparse apical transverse band of setae.

Diagnosis.

Very similar to I. badius , distinguished by the distinctly shorter third antennomere (compared with A2). As with I. badius , this species runs to I. nautalis Kozlov & Lê in the keys of Kozlov and Lê (1987) and Lê (2000). It differs in the absence of longitudinal striae on T3. Distinguished from other species of Idris by its COI sequence.

Host.

Calapnita nunezae Huber (ZFMK, Phi271), Panjange camiguin Huber (ZFMK, PSt1564 = Ar 15064), Tissahamia bukittimah (Huber) (ZFMK, Mal 256) (Fig. 16), Uthina luzonica Simon (ZFMK, Mal228 = Ar 19637 and Mal226) ( Araneae : Pholcidae ).

Etymology.

The name curtus , Latin for short, refers to relative length of the first flagellomere of the female antenna. It is intended to be used as an adjective.

Material examined.

Holotypefemale: SINGAPORE: 50 m a.s.l., 1°21.6'N 103°46.7'E, Dairy Farm Nature Park, 15.ii.2015, B. A. Huber & J. Koh, reared ex egg of Tissahamia bukittimah (Huber), OSUC270831. Paratypes: SINGAPORE: 6 females, 2 males, with same data as holotype, OSUC270832, 270833, 420829-420831, 420833, 627623, 627624. 1 female, 2 males with same data as holotype except reared ex egg of Uthina luzonica Simon, OSUC420836, 6217633, 627634. PHILIPPINES: Visayas, Bohol, Bilar, Barangay Riverside, 440 m a.s.l., 9.7052N, 124.1253E, 15.vi.2015, M.R.B. Dacar; reared ex egg of Panjange camiguin Huber, 1 female, 1 male, OSUC420834, 627632. Other material: SINGAPORE: 50 m a.s.l., 1°21.6'N 103°46.7'E, Dairy Farm Nature Park, 15.ii.2015, reared, B. A. Huber & J. Koh, ex egg of Tissahamia bukittimah (Huber), female, OSUC420832 (broken specimen); ex egg of Uthina luzonica Simon, male, OSUC420835 (broken). The remaining material is based on DNA sequences from pupae. SINGAPORE: Upper Selatar Reservoir Park (1°21.3'N, 103°48.4'E), 20 m a.s.l., 15.ii.2015 (B.A. Huber, D. Court). Host: Uthina luzonica Simon. PHILIPPINES: Mindanao, Mt. Matutum, Kawit Forest, 'site 1', (6.338N, 125.104E), 950 m a.s.l., along brook, on leaves, 13.ii.2014, B. A. Huber, ex egg of Calapnita nunezae Huber.