Aristobatina metamelasma Marshall 2014, sp. n.

Aristobatina metamelasma sp. n. Figs 1–6 Etymology: From the Greek words meta (near) and melasma (black spot), referring to the distinctive discal macula on the wing of this and the closely related A. melasma. Description: Length (head to wing tip): 13–15 mm. Colour: Head orange anteriorly, reddish brown posteriorly, swollen part of frontal vitta dark reddish brown; thorax dark reddish brown; abdomen shiny blue­black; fore femur orange in basal ⅔, brown distally; mid and hind femur uniformly orange except for a small dark area at apex; mid tarsus dark brown or black; basal ½ of tarsomere 1 of hind leg pale, tarsus otherwise dark brown to black; abdominal pleurae grey on pinned types. Head: Scape bare except for marginal ring of short setae; pedicel short and setose, with some longer ventral apical setae; frontal vitta with strongly convex elongate oval area surrounding ocelli and extending half the distance from anterior ocellus to anterior margin of frons; 2 pairs of fronto-orbital setae, 1 large and above level of ocelli, 1 smaller below; postocellar, outer and inner vertical setae well­developed. Thorax: Cervical sclerite flat, dull, microtrichose; proepisternum with a few long marginal ventral setae on posterior ½; katepisternum with double row of thin black setae, anterior row with only 5 setae, barely overlapping with lower end of posterior row; scutellum with 1 pair of marginal setae only, 1 small to minute seta between postalar and dorsocentral setae. Wing: CuA 2 virtually at right angle to and in line with bm­cu, wing membrane with a distinctly infuscated tip and a small, circular discal macula extending from just anterior to R 4+5 to M; tegula, basicosta and stem vein brown, similar to adjacent wing base, stem vein dorsally microsetulose at base; wing base with 3 long costagial setae, inner one very long and inclinate. Female abdomen: Paired spermathecae elongate egg­shaped, 1.9× as long as wide, with a constriction in basal ⅓, surface otherwise smooth, spermathecal duct densely covered with knob­like processes beyond the division of the common duct into 2 straight branches (Fig. 1). Single spermatheca on a much shorter and smaller duct, body densely covered with processes much like the paired spermathecal ducts. Male abdomen: Pleuron with large dome­like differentiated area on segment 4 (occupying approximately ventral ¾ of pleuron 4); hypandrium with a very short anterior plate and strong posterodorsal arms connecting to phallic plate, dorsolateral margin of posterodorsal arm with a prominent lobe (Fig. 5). Basiphallus elongate and tapered posteriorly, extending well beyond base of distiphallus; postgonites equal, small and finely spinulose ventrally; distiphallus with tubular basal part bifurcating before transition into strongly dextrally recurved membranous distal part, apex with a finely spinulose glans (Fig. 6); ejaculatory apodeme slightly larger than epandrium; genital fork (sternite 5) with gap Y­shaped at base (Fig. 4), inner surfaces of arms densely spinose and with a right-angled bend in the middle. Holotype ♂ and 3♀ paratypes: TANZANIA: Uluguru Mountains: “Tanganyika, Ulguru Mts, 1500–1800m ” (CNCI). Comments: This species is closely related to A. melasma, from which it differs in spermathecal shape and sculpturing and in the pigmentation of the hind tarsus.

Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.