Chelostoma (Foveosmia) longifacies, Müller, Andreas, 2012

Müller, Andreas, 2012, New European bee species of the tribe Osmiini (Hymenoptera: Apoidea: Megachilidae), Zootaxa 3355, pp. 29-50 : 34-36

Chelostoma (Foveosmia) longifacies spec. nov.

Holotype: Greece, Rhodes: Elousa, 200m, 12.5.2005, ɗ (leg. A. Müller), [ ETHZ].

Paratypes: Greece, Lesvos: 1.8km S of Molyvos, 15m, 30.4.2004, 1 ɗ (leg. O. Messinger); Moria, 2.5.2005, 1 ɗ (leg. A. Grace); Messagros Conventional, 1 Ψ (leg. H. Dahm). Rhodes: Afanton, 10.5.1966, 1 Ψ (leg. K. Schön); Stegna, 0–20m, 4.5.2005, 1 Ψ (leg. A. Müller); Archangelos, 100m, 8.5.2005, 1 Ψ (leg. A. Müller); Afandou, 150m, 10.5.2005, 3 Ψ, 1 ɗ (leg. A. Müller); Elousa, 200m, 12.5.2005, 2 Ψ, 3 ɗ (leg. A. Müller). Samos: Kokkari, 2.5.1977, 1 ɗ (leg. H. Teunissen). Turkey, Antalya: Beldibi, 23.4.– 5.5.1988, 1 ɗ (leg. H. Wolf); Lycia, Patara, 13.4.1998, 1 ɗ (leg. W. Arens).

Diagnosis. C. longifacies belongs to the campanularum group of the subgenus Foveosmia ( Sedivy et al., 2008, as C. species 23; Müller, 2012). The female can be separated from the other European Foveosmia species by the long and slender head, which is more than 1.15x as long as broad ( Fig. 7 ). The male is also reliably characterized by the slender head, which is more than 1.05x as long as broad, as well as by the dense, short and uninterrupted hair comb at the apical margin of sternum 5, which covers the whole sternal width ( Fig. 8 ). The male of C. campanularum (KIRBY) has a similar hair comb, which, however, is distinctly less wide and does not reach the sides of sternum 5. In addition, the basal zone of the propodeum of the male of C. longifacies is about as long as the metanotum, while it is distinctly longer in C. campanularum .

Description. Female: Body length 4–5mm. Head: Mandible with three teeth, basal tooth only weakly developed. Labrum slightly extending beyond the closed mandibles and faintly diverging towards the apex, its apical part bulged and apically truncated. Second segment of the labial palpus about 5x as long as the first segment. Clypeus slightly convex, its apical margin truncated and with minute teeth. Punctation of the clypeus dense with interspaces of the diameter of one half to one puncture. Punctation of the frons less dense with interspaces varying between the diameter of one half and two punctures. Head more than 1.15x as long as broad ( Fig. 7 ). Thorax: Punctation of scutum and scutellum moderately scattered with interspaces varying between the diameter of one half and three punctures. Basal zone of the propodeum about 1.25x as long as the metanotum, with coarse longitudinal carinae and limited from the declivous part of the propodeum by a distinct ridge. Metasoma: Apical margin of terga 1–3 ciliated laterally with whitish hairs, but lacking conspicuous hair bands. Punctation of terga dense with interspaces of usually less than the diameter of one puncture.

Male: Body length 4–5mm. Head: Second segment of the labial palpus about 5x as long as the first segment. Punctation of clypeus very dense with interspaces rarely exceeding the diameter of half a puncture. Punctation of frons distinctly less dense with interspaces varying between the diameter of one half and two punctures. Head more than 1.05x as long as broad. Thorax: Punctation of scutum and scutellum moderately scattered with interspaces varying between the diameter of one half and three punctures. Basal zone of the propodeum of about the same length as the metanotum, otherwise as in the female. Metasoma: Apical margin of terga 1–3 ciliated laterally with whitish hairs, but lacking conspicuous hairs bands. Terga densely punctate with interspaces of the diameter of one half to one puncture. Tergum 7 with a basal pit and two lateral teeth, which are about 2.5x as long as broad, parallel-sided and separated from each other by an incision that is slightly broader than the maximal diameter of the lateral teeth. Sternum 2 with a weak median elevation of oval shape. Sterna 3–4 with transversal swellings. Apical margin of sternum 4 with a membraneous appendage, which is slightly emarginated medially and about as long as tarsal segment 3 of the hind leg. Apical margin of sternum 5 with a dense, short and uninterrupted hair comb, which covers the whole sternal width and reaches the sternal sides ( Fig. 8 ).

Distribution. Known so far from several islands of the Aegean sea and from southwestern Turkey.

Host plants. Oligolectic on Campanula and possibly related genera of the Campanulaceae ( Sedivy et al., 2008, as C. species 23).

Etymology. longifacies = with a long face.

Figures

FIGURE 1 – 8. 1: Chelostoma comosum spec. nov., metanotum and propodeum of Ψ. 2: Chelostoma comosum spec. nov., median elevation on sternum 2 of ɗ. 3: Chelostoma siciliae spec. nov., clypeus of Ψ. 4: Chelostoma siciliae spec. nov., metanotum and propodeum of Ψ. 5: Chelostoma incognitum spec. nov., apical part of labrum of Ψ. 6: Chelostoma incognitum spec. nov., terga 6 – 7 of ɗ. 7: Chelostoma longifacies spec. nov., head of Ψ. 8: Chelostoma longifacies spec. nov., apical hair comb on sternum 5 of ɗ.