Eucremastus rufoantennalis, Gadallah, Neveen S., Soliman, Ahmed M. & Al Dhafer, Hathal M., 2017

Gadallah, Neveen S., Soliman, Ahmed M. & Al Dhafer, Hathal M., 2017, First record of the genus Eucremastus Szépligeti, 1905 (Hymenoptera: Ichneumonidae: Cremastinae) from the Arabian Peninsula, with the description of three new species, Zootaxa 4216 (4), pp. 339-354 : 349-351

Eucremastus rufoantennalis sp. nov. Gadallah & Soliman

( Figs 8 A–E, 9A–D, 10A–C)

Material examined. Holotype ♀: Saudi Arabia, Al-Quwayiyah, Rawdhat Al-Harmalyiah [24°17'50"N, 45°08'49"E] (786m), light trap, 17.iv.2015 (leg. Al Dhafer et al.) [ EFC] . Paratype 1♀: Saudi Arabia, Al-Zulfi , Rawdhat Al-Sabalh [26°23'17"N, 44°58'38"E] 670m, light trap, 25.x.2015 (leg. Al Dhafer et al.) [ KSMA] .

Description. FEMALE (holotype). Body length 9.0 mm, fore wing length 5.0 mm, ovipositor length 4.0 mm.

Head. Antenna with 29 flagellomeres, F1 about 4.6 × as long as wide ( Fig. 8 D). Gena short, constricted behind eyes ( Fig. 8 D). Occipital carina very thin, greatly interrupted medially. Occiput with dense, irregularly distributed punctures. Head densely shallowly punctate, punctures separated by distances more than a puncture diameter, larger and denser on face ( Fig. 8 B); clypeus with fewer large punctures. Ocelli rather small; MOD 1.3 × OOD; IOD 2.0 × OOD ( Fig. 8 B, D). Inner eye margins nearly parallel-sided ( Fig. 8 B). Clypeus slightly convex in profile, with fine suberect hairs, ventral margin slightly rounded ( Fig. 8 B). Malar space about 0.3 × basal width of mandible. Mandible with inner tooth slightly longer than outer one ( Fig. 8 C).

Mesosoma. Densely punctate, fewer and widely spaced in middle of mesoscutum and base of scutellum ( Fig. 8 E). Notauli distinct, not reaching anterior margin of mesoscutum ( Fig. 8 E), axilla densely punctate. Mesopleuron striato-punctate ( Fig. 9 A). Propodeum distinctly transversely wrinkled, especially medially ( Fig. 8 E). Legs slender, middle tibiae, each with one spur. Claws small and thin, each with three inner teeth.

Wings. Fore wing densely covered with minute setae apically, less dense on disco-submarginal and 2nd discal as well as marginal cells (hardly seen) ( Fig. 9 B). Vein Rs slightly concave to nearly straight ventrally; pterostigma narrowly triangular, 3.8 × as long as broad; vein R1 shorter than pterostigma (0.7 ×) ( Fig. 9 B). Hind wing ( Fig. 9 C) with eight hamuli.

Metasoma. T1 about 1.17 × T2 ( Fig. 10 A). Lateral sides of T1 almost touching each other ventrally, obscuring most of S1 (except anteriorly and posteriorly). Posterior margin of T1 and almost all T2 are finely longitudinally striated ( Fig. 10 A); T2 with two distinct lateral longitudinal grooves along its whole length ( Fig. 10 A, B). The following tergites punctate especially laterally. Ovipositor very slightly downwardly curved apically ( Fig. 10 C), with a subapical notch; ovipositor sheath very thin, densely clothed with fine erect sensory setae along its whole length, ending with a specule ( Fig. 10 C).

Colour. Generally whitish with the following parts slightly yellowish ( Fig. 8 A): T1 subapically ( Fig. 10 A), anterior band on T4 and T5, almost all T5 ( Fig. 10 B). Anterior margin of T2 and T3 brownish, giving off a shiny hue along the middle area of T2 ( Fig. 10 A). Antennal flagellum and mandibular teeth dark brown ( Fig. 8 C, D). Ovipositor dark reddish-brown, with yellowish tip, ovipositor sheath entirely black ( Fig. 10 C). Wing hyaline with dark brown wing veins (except 1A membranous), pterostigma pale brown ( Fig. 9 B).

MALE. Unknown.

Remarks. The holotype female is of type 0 of Mazón & Bordera (2015), however the paratype female belongs to type 1 with both middle tibiae having two unequal spurs ( Fig. 9 D).

Etymology. The species name is derived from the Latin (adj.) “ rufus ” related to the reddish-brown antenna.

Figures

FIGURE 8 (A ̄ E) E. rufoantennalis sp. nov. (paratype ♀): A. lateral habitus; B. frontal view of head; C. mandibles; D. dorsal view of head and basal segments of antennae; E. dorsal view of mesosoma.

FIGURE 9 (A ̄ D) E. rufoantennalis sp. nov. (paratype ♀): A. lateral view of head and mesosoma; B. fore wing; C. hind wing; D. mid tibial spurs.

FIGURE 10 (A ̄ C) E. rufoantennalis sp. nov. (paratype ♀): A. dorsal view of propodeum, metasomal T 1 & T 2; B. lateral view of metasoma; C. apex of metasoma and ovipositor.