Cyrtolabulus parvulus Selis, 2024

Selis, Marco, 2024, Revision of the genus Cyrtolabulus van der Vecht in Madagascar (Hymenoptera: Vespidae: Eumeninae), Zootaxa 5406 (1), pp. 66-86 : 74-76

Cyrtolabulus parvulus Selis , sp. nov. ( Figs. 5–6 )

Diagnosis. Recognized by the following combination of characters: gena evenly convex, pronotal carina sharp and pointing forward on humeri, propodeum largely red and with an horizontal face roundly passing into vertical face, submarginal carina produced in a long and narrow spine, S2 as long as T 2 in lateral view, apical lamella of T2 pigmented and preceded by a thickening of the tergite, T3 apically simple and with coarser punctures medially, F11 of male apically rounded and not reaching F8, female clypeus red with yellow basal margin, sparsely and finely punctate.

Material examined. HOLOTYPE: ♂, labeled “MADAGASKAR: TULÉAR / Tuléar-Morombe / PK 32 (S.I.B.) / 21.-23.V.97, MADL // Cyrtolabulus / bekilyensis (G.S.) ♂ / J.Gusenleitner,det.2005 // NHMW // Cyrtolabulus parvulus / HOLOTYPE ♂ / Det. Marco Selis ” ( NHMW) . PARATYPES. MADAGASCAR: Toliara, Sarodrano , 26.V.1998, leg. M. Madl, 1♀ ( NHMW) ; Tuléar , 32km N Tulear (S.I.B.), 24.X.1996, leg. M. Madl, 1♀ ( NHMW) ; same data as holotype, 1♀ ( NHMW) .

Description. Male holotype. Body length 4.5 mm; fore wing length 3.2 mm.

Head 1.3× as wide as long in frontal view. Clypeus 1.2× as wide as long in frontal view, apical margin shallowly emarginate and narrower than interantennal space, 0.27× as wide as width of clypeus, apical angles obtuse; clypeus in lateral view evenly convex. Interantennal space rounded, very weakly tuberculate above. Distance from posterior ocellus to occipital margin 1.6× as long as the distance from posterior ocellus to inner eye margin; vertex in lateral view flattened and markedly sloping, posterior margin placed below level of upper eye margin. Gena 0.7× as wide as eye at bottom of ocular sinus; occipital carina complete, strong and shortly lamellate on gena, lower on vertex, duplicated in median third of vertex. F1 1.3× as long as wide and as long as F2; F2 distinctly longer than wide; F3–F4 subquadrate; F5–F8 wider than long; F9 subquadrate; F11 elongate and finger-shaped, sides evenly tapering to rounded apex, reaching basal fourth of F9. Mandible short and robust, first two teeth triangular and pointed, third tooth subquadrate. Mesosoma in dorsal view 1.5× as long as wide. Pronotum in dorsal view almost parallel-sided; pronotal carina almost entirely absent, visible and sharp on humeri only; humeri sharp and slightly acute in dorsal view, weakly projecting forward; dorsal and anterior faces of pronotum smoothly passing into each other. Mesoscutum very weakly convex in lateral view, with very shallow hints of notauli along posterior margin. Scutellum barely convex, much wider than long; axillary fossa small but circular. Metanotum sharply angled in lateral view, with a short but distinct anterior face in dorsal view; transverse carina sharp and strong, shallowly sinuate in the middle. Tegula with strongly convex outer margin, maximum width near middle, posterior lobe obtuse with apex equaling parategula and posterior margin partly exceeding it; parategula weakly curved in dorsal view, depressed on the inner side. Mesepisternum with a short but strong vertical carina originating from lower apex of epimeron; epicnemial carina barely visible. Propodeum sharply angled in lateral view, with an horizontal face about as long as scutellum; dorsal faces flattened and strongly sloping toward valvulae, forming an horizontal face behind metanotum, horizontal face slightly depressed in the middle and posteriorly margined by two irregularly conical protuberances; lateral face weakly depressed, strongly margined above; posterior face as a broad and shallow depression, with a deeper pit above propodeal orifice; all carinae present but dull, separating all the faces; submarginal carina produced in a depressed subtriangular lobe above valvula. T 1 in dorsal view 1.95× as long as apically wide, sides strongly diverging in basal fifth, then almost parallel sided to apex; apical margin strongly swollen and preceded by a deep preapical furrow; T 1 in lateral view abruptly expanded at extreme base, then of even height except for deep preapical furrow. S1 triangular, basal stalk shorter than expanded part. T2 about as wide as long in dorsal view, sides strongly convex basally then parallel to the apex; in lateral view strongly convex basally then flattened; apical margin with a costulate lamella, separated from rest of tergite by a high step. S2 less convex than T2, apical margin lamellate like T2 but lamella medially longer. T3 apically lamellate, lamella not costulate and preceded by a shallower step than on T2.

Clypeus weakly shiny, with large and irregular shallow punctures. Head and mesosoma densely and deeply punctate, interspaces shiny and convex, shorter than one puncture diameter, punctures larger on pronotum and mesoscutum. Anterior face of pronotum entirely densely and deeply punctate, punctures similar to ones on dorsal face but smaller. Metanotum densely and coarsely punctate, except for smooth ventral half of posterior face. Mesepisternum with flattened interspaces more variable in size; epicnemium shagreened with scattered deep punctures; metaepisternum micropunctate, with few scattered shallow punctures. Tegula shiny, with very fine and sparse rugosities and few scattered punctures on anterior half. Dorsal face of propodeum with flat-bottomed polygonal cells, separated by narrow flattened interspaces; posterior depression mostly smooth and shiny, with sparse micropunctures; lateral face densely and finely striate, with some deep punctures along dorsal margin. T1 with coarse punctures, smaller and deeper basally, becoming larger and shallower posteriorly; interspaces smooth and shiny with very sparse micropunctures; basal sloping area and apical part impunctate. T2 densely and deeply punctate, interspaces densely micropunctate and variable from half to two puncture diameters; apical lamella basally margined by a series of elongate deep punctures. T3 with preapical group of coarse and dense punctures. T4–T7 shagreened and partly finely punctate. S1 smooth and shiny, with scattered deep punctures. S2–S7 sculpted similar to respective tergites but punctures sparser; interspaces on S2 strongly shiny and not micropunctate. Whole body with short pale pubescence, denser and silvery on clypeus, lower half of frons, gena and sides of mesosoma; erect short setae on head, pronotum, mesepisternum, T1 and S1–S6.

Genitalia in Fig. 6B .

Black; following parts red: mandible, most of antenna, margins of pronotum, posterior third of scutellum, tegula, posterior face of metanotum, most of dorsal face of propodeum and dorsal margin of lateral face, legs, most of T1, margins of T2; following parts pale yellow: clypeus, large basal marking on mandible, anterior margin of pronotum except median fifth, paired spots on posterior third of scutellum, posterior lobe of tegula, apical projection of submarginal carina, narrow apical margin on T1–T2 and S2, outer face of fore and mid tibia. Wings hyaline, very weakly infuscate along anterior margin.

Female. Body length 4.8–5.5 mm; fore wing length 3.2–3.6 mm.

Differing from male as follows: clypeus 1.15× as wide as long and more convex in lateral view, apical margin weakly reflexed and 0.25× as wide as clypeus, shallowly emarginate, surface very finely micropunctate with sparse fine punctures; flagellomeres proportionally shorter; T1 stouter and 1.75× as long as apically wide, more convex dorsally; clypeus red with yellow basal margin, pale yellow markings more developed on mesosoma.

Distribution. Madagascar: Toliara ( Gusenleitner 2005) ( Fig. 12 ).

Etymology. The specific name is in reference to the small size of the species.

Notes. The typical series was misidentified by Gusenleitner (2005) as C. bekilyensis .

Figures

FIGURE 5. Cyrtolabulus parvulus sp. nov. A–B, habitus. C, head of male. D, head of female.

FIGURE 6. Cyrtolabulus parvulus sp. nov. A, tegula. B, male genitalia (aedeagus in ventral and lateral view, paramere with detail of digitus).

FIGURE 12. Distribution maps of Malagasy Cyrtolabulus.