Chelostoma ( Chelostoma ) ornithogali Müller, 2025

Chelostoma ( Chelostoma) ornithogali Müller , sp. nov.

Holotype. TURKEY: Konya: Bozkır, dry forest near Üçpınar , 1200 m, 4.6.1993, ♀ (leg. S. Risch). Deposited in the Entomological Collection of ETH Zurich.

Paratypes. TURKEY: Adana: Pozantı , 10.– 15.5.1955, 1♀ (leg. Seidenstücker) ; Antalya: Taurus Mountains, near Suleymaniye , 1200 m, 25.5.1990, 1♀ (leg. S. Risch) ; Hakkari: 25 km SW Hakkari , 1200 m, 31.5.1980, 1♀ (leg. K. Warncke) ; 5 km N Oramar (= Dağlıca ), 11.6.1981, 1♀ (leg. M. Kraus) ; Konya: Taurus Mountains , W Seydişehir, 1200m, 25.5.1990, 1♂ (leg. S. Risch) ; Mersin: Taurus, Abanoz ( Rte Anamur to Kazancı ), 1100–1200m,?, 1♂ (leg. H. Teunissen) . Deposited in the Entomological Collection of ETH Zurich .

Diagnosis. C. ornithogali is similar to the other representatives of the C. mocsaryi species group. The females differ from the other species of the C. mocsaryi group by the following combination of characters: i) vertex rather long with distance between outer margins of posterior ocelli being about as long as distance between anterior margin of lateral ocellus and occipital margin ( Fig. 68 View FIGURES 66–73 ), and ii) inner margin of mandible without tooth between base and second outermost tooth, rendering mandible two-toothed ( Fig. 69 View FIGURES 66–73 ). The males of C. ornithogali can be distinguished from the other species of the C. mocsaryi group by the following combination of characters: i) hypostomal area with two tooth-like projections adjacent to hypostomal carina ( Fig. 70 View FIGURES 66–73 ), ii) polished impunctate zone of genal area along lower margin of compound eye much narrower than width of antennal flagellum in its apical half, iii) upper teeth of tergum 7 narrow and parallel-sided, not hiding lower teeth when seen from above ( Fig. 71 View FIGURES 66–73 ), iv) median projection of sternum 2 rather wide and anteriorly not prolonged into almost vertically projecting lamella, its anterior margin sharp and slightly overhanging anterior surface, and angle between anterior and ventral surface much less than 90 degrees in lateral view ( Fig. 72, 73 View FIGURES 66–73 ), v) patches of black thorns on sternum 3 rectangular and separated from each other by a distance shorter than to maximally as long as maximum width of the thorn patch ( Fig. 73 View FIGURES 66–73 ), and vi) apical part of gonoforceps laterally not flattened, its apex roof-shaped when seen from behind.

Description. FEMALE ( Fig. 66 View FIGURES 66–73 ): Body length 8–9 mm. Head: Head 1.05–1.1× as long as wide. Distance between posterior margin of lateral ocellus and occipital margin 2.1–2.3× as long as ocellar diameter and distance between outer margins of posterior ocelli about as long as distance between anterior margin of lateral ocellus and occipital margin ( Fig. 68 View FIGURES 66–73 ). Clypeus slightly convex with median and apical half diverging by about 150 degrees in lateral view; its punctation very dense with interspaces not exceeding the diameter of half a puncture except medially where the interspaces may rarely reach the diameter of one puncture. Apical margin of clypeus medially straight and denticulate and laterally slightly protruding. Labrum about 2.75× as long as apically wide, basally flat and apically truncate to very shallowly emarginate. Mandible two-toothed, its inner margin without tooth between base and second outermost tooth ( Fig. 69 View FIGURES 66–73 ). Proboscis short ( Fig. 66 View FIGURES 66–73 ), not reaching till base of fore coxa when folded; second segment of labial palpus 2.6–2.8× as long as first segment and about 0.5× as long as compound eye. Mesosoma : Posterior and lateral surface of propodeum largely polished. Basal area of propodeum medially about as long as to slightly shorter than metanotum, more or less strongly impressed over entire width, crossed by rather coarse longitudinal carinae and bordered posteriorly by a raised and polished transverse ridge. Metasoma: Terga 2–3 not or only weakly constricted at base. Marginal zones of terga 1–4 with short and dense white hair bands ( Fig. 66 View FIGURES 66–73 ), which are not interrupted in fresh specimens. Scopa white, its hairs not plumose ( Fig. 66 View FIGURES 66–73 ).

MALE ( Fig. 67 View FIGURES 66–73 ): Body length 7–8 mm. Head: Head about as long as wide. Genal area along lower margin of compound eye with polished to slightly shagreened impunctate zone, which is much narrower than width of antennal flagellum in its apical half. Distance between posterior margin of lateral ocellus and occipital margin 1.4– 1.5× as long as ocellar diameter. Hypostomal area with two tooth-like projections arising laterally to hypostomal carina ( Fig. 70 View FIGURES 66–73 ). Proboscis short ( Fig. 67 View FIGURES 66–73 ), not reaching till base of coxa of fore leg when folded; second segment of labial palpus about 3× as long as first segment and about 0.5× as long as compound eye. Antennal segments 3 and 13 distinctly longer than wide, segments 4–12 about as long as wide to slightly longer or shorter; anterior side and to large extent also posterior side of segments (4)5–12(13) yellowish-red. Mesosoma : Posterior and lateral surface of propodeum largely polished. Basal area of propodeum medially as long as to slightly shorter than metanotum, impressed over entire width, crossed by rather coarse longitudinal carinae and bordered posteriorly by a raised and polished ridge. Tibial spur of fore leg apically truncate to almost imperceivably emarginate. Metasoma: Marginal zones of terga 1–5 with rather short and dense white hair bands ( Fig. 67 View FIGURES 66–73 ), which are widely interrupted on terga 1–3. Terga 2–3 basally not or only weakly constricted. Tergum 7 basally with roundish pit and apically with two teeth, which are narrow, parallel-sided and slightly diverging, apically truncate to weakly rounded, 1.5-1.75× as long as basally wide, and separated from each other by a semicircular incision, which is about 3× as wide as tooth width ( Fig. 71 View FIGURES 66–73 ). Ventral base of apical teeth of tergum 7 with large backwardly and inwardly directed tooth-like projection, the tip of which is visible when viewed from above ( Fig. 71 View FIGURES 66–73 ). Apical margin of sternum 1 medially very shallowly emarginate. Median projection of sternum 2 in ventral view broadly triangular to half-elliptical in shape with rounded anterior margin, medially slightly impressed, more or less densely punctate and largely polished and laterally surrounded by narrow impunctate and polished to weakly shagreened zone ( Fig. 73 View FIGURES 66–73 ); in lateral view, anterior margin of median projection sharp and slightly overhanging anterior surface, and angle between anterior and ventral surface much less than 90 degrees ( Fig. 72 View FIGURES 66–73 ). Sternum 3 with well-developed and long whitish pilosity and medioapically with two rather large and rectangular patches of short black thorns, which are separated from each other by a distance shorter than to maximally as long as maximum width of the thorn patch ( Fig. 73 View FIGURES 66–73 ); apical margin of sternum 3 medially slightly emarginate and with short membraneous appendage that is medially divided into two lobes. Sternum 4 densely covered with whitish pilosity, which surpasses apical margin and is apically curled downwards. Apical margin of sternum 5 with a single row of long and thin yellowish-white bristles. Sternum 6 roughly quadrangular in shape, its apical half polished, almost hairless, sparsely punctate and medially impressed. Apical part of gonoforceps laterally not flattened, its apex roof-shaped when seen from behind.

Distribution. Southern central to easternmost Turkey ( Fig. 74 View FIGURE 74 ).

Pollen hosts. Four pollen loads from four different localities exclusively consisted of an identical type of monocotyledonous pollen that could not be distinguished from pollen of Ornithogalum ( Asparagaceae ) at a magnification of 400×, suggesting that C. ornithogali is oligolectic on Ornithogalum .

Nesting biology. Unknown.

Etymology. The species epithet refers to the probable pollen specialization on Ornithogalum .