Amphibulus arushaensis, Schwarz, 2025

Schwarz, Martin, 2025, The Afrotropical species of the genus Amphibulus (Hymenoptera, Ichneumonidae, Phygadeuontinae), Linzer biologische Beiträge 57 (1), pp. 359-366 : 363-364

Amphibulus arushaensis nov.sp.

T y p e m a t e r i a l Holotype (J): " Tanzania, prov. Arusha [,] 45 km E of Arusha, 930 m 03°23'22"S 37°00'01"E [,] J. Halada, 2.4.2018 ", " Holotypus ", " Holotypus Amphibulus J arushaensis SCHWARZ des. Mart. Schwarz '25", "OLML-0001-0610" (OLML). Paratypes (2JJ): same data as holotype, except OLML-0001-0611 and OLML-0001-0612 (OLML).

D e s c r i p t i o n (J) ( Fig. 10 ): Antenna with 31 segments, segments 12/13-15/16

with linear tyloids widened medially or beyond the middle ( Fig. 14 ); third segment

(without annellus) 1.8-1.9 times as long as wide and 1.0-1.1 times as long as fourth segment.

Head, mesosoma, first segment of metasoma laterally and legs with rather long setae.

Face and clypeus with a smooth background, punctation moderate or coarse, partly with rugosity ( Fig. 11 ); central convexity of face weak. Clypeus wide, 0.3-0.4 times as high as wide, ventral margin smooth, in profile hardly convex, above ventral margin without a distinct transverse furrow, median part of ventral margin upturned, without teeth. Mandible with upper tooth distinctly longer than lower tooth ( Fig. 13 ). Malar space with a weak furrow, 0.3 times as long as basal width of mandible. Temple lustrous with fine or moderate and scattered punctation. Frons lustrous, with coarse to fine punctation; punctures somewhat scattered to dense, in the last case partly confluent. Shortest distance between eye and hind ocellus (OOL) 0.7-0.8 times as long as the distance between hind ocelli (POL). Head in dorsal view behind the eyes weakly narrowed and convex ( Fig. 12 ).

Upper part of pronotum laterally with fine or very fine and scattered punctation. Mesoscutum with a smooth background, lateral lobe with very fine and scattered punctures; median lobe with fine or very fine and scattered punctures, but punctation somewhat denser than in lateral lobe; centre of the mesoscutum densely and coarsely punctured; notaulus indicated. Posterior margin of mesoscutum with a transverse break. Scuto-scutellar groove without median longitudinal carina, smooth. Scutellum weakly convex, laterally without carina; scutellum on a smooth background with few moderate or fine punctures. Mesopleuron except speculum with coarse, moderate or fine punctation on a smooth background; speculum mainly smooth, but dorsally with very fine punctation; subtegular ridge sharp; sternaulus distinct until about midlength of mesopleuron. Epicnemial carina ventrally not widened, dorsally reaching lateral part of pronotum at about its midheight; transverse carina of the mesosternum distinctly elevated and not bilobed medially. Mesosternum medially with a moderately impressed longitudinal furrow with rather robust transverse ridges. Metapleuron with moderate to very fine punctures.

Propodeum of moderate length and with all carinae distinct, but anterior transverse carina sometimes partly absent or indistinct, thus area basalis and area superomedia may be confluent; posterior transverse carina somewhat more robust than the other carinae, without apophysis; area superomedia 1.1-1.3 times as long as wide, with costula anterior of its middle; dorsal part of propodeum lustrous and with very fine punctures, mainly anteriorly. Spiracle oval.

Femora mainly ventrally with long setae; hind femur 4.0 times as long as wide. Fore and mid tibiae with rather indistinct spines dorsally and anteriorly; tibiae without or with only a few long setae.

Fore wing with sides of areolet strongly convergent upwards; 2m-cu joining areolet somewhat before or behind its middle; ramulus absent; 1cu-a interstitial or weakly postfurcal. Hind wing with nervellus distinctly inclivous; hind abscissa of CU distinct.

First segment of metasoma without latero-median carina. Postpetiole with scattered very fine punctures on a smooth background, present mainly laterally and anteriorly. Second and third tergites with very fine and scattered punctation on a smooth background, punctation more scattered than in A. africanus LUHMAN.

Coloration: black. Mandible basally, narrow distal margin of metasomal tergites 5-7 or 6-7 white. Fulvous are scape, sometimes pedicel partly, mandible anterior of teeth, palpi (sometimes whitish), sometimes tegula, most of legs, postpetiole, metasomal tergites 2-4. Hind tarsus blackish except proximally. Fore coxa entirely or partly, sometimes mid coxa entirely or partly, fore trochanter entirely or partly, sometimes mid trochanter partly, fore and mid trochantelli partly and sometimes hind trochantellus partly whitish. Pterostigma yellowish.

Body length: 6.3-8.6 mm.

E t y m o l o g y: Named after the type locality Arusha.

Figures

Figs 10-14: Amphibulus arushaensis nov.sp., holotype, J. (10) Habitus laterally; (11) head in facial view; (12) head dorsally; (13) mandibles; (14) antennal segments with tyloids.