Andrena (Euandrena) yangi, Dubitzky, Andreas, 2006

Dubitzky, Andreas, 2006, New palearctic species of the bee genus Andrena (Insecta: Hymenoptera: Andrenidae), Zootaxa 1284, pp. 1-27 : 10-13

Andrena (Euandrena) yangi sp. n.

( Figs 2 B–D, 3D, I, 5A)

Female. BL: 7.9–9.1 mm (8.4 mm). FWL: 6.8–7.3 mm (7.0 mm).

Structure. Head nearly round, only 1.14 times broader than long in frontal view ( Fig. 2 B). Galea shiny to weakly dull, densely tesselate, without distinct punctation. Mandibles bidentate. PLR large, trapezoid, smooth and shiny, about twice as broad as long ( Fig. 2 B). Apical margin of PLR about half as wide as basal margin, straight to weakly emarginate in the middle. Clypeus about 1.5 times broader than long, with regular (1) large punctation on disc. Basal part of clypeus densely tesselate, dull becoming more and more smooth and shiny apically. POA tesselate, dull to weakly shiny with dense punctation (<1). SCA tesselate, dull with extremely dense, inconspicuous small punctation. Frons dull to weakly shiny with distinct longitudinal notches between dense punctation. Vertex finely tesselate, dull to weakly shiny except a smooth and shiny area behind upper margin of compound eyes. FOV ( Figs 2 C, D) especially upper part extremely broadened, nearly reaching LO along inner margin. Extension of FOV reaching from hind margin of LO to lower margin of antennal insertion. GA broad, slightly broader than compound eye in lateral view, tesselate, shiny with indistinct punctation. Scape distinctly longer than following three segments together, densely tesselate on ventral side. AS 3 about twice as long as broad, distinctly longer than AS 4 and AS 5 together. AS 4 and AS 5 broader than long, AS 6– AS 9 about as long as broad, AS 10 and 11 slightly longer than broad. AS 12 about twice as long as broad. Pronotum strongly tesselate, dull to weakly shiny, with inconspicuous weak punctation. Scutum strongly tesselate, dull (anterior part) to weakly shiny (posterior part) with distinct, large punctation (1). Anterior part of scutum with distinct smooth and shiny median line. Scutellum tesselate, dull to weakly shiny with indistinct dispersed punctation (1). Metanotum strongly tesselate to granulate, dull. PT granulate, dull to weakly shiny, with few weak wrinkles basally. DLP distinctly more shiny than PT, weakly granulate, with inconspicuous punctation (1). LP weakly tesselate, shiny with dispersed punctation. Mesepisterna tesselate, dull to weakly shiny, with indistinct punctation. Tegulae weakly tesselate, distinctly shiny. Claws of all legs distinctly bidentate. T tesselate, with indistinct flat punctation (1). Dorsolateral convexity of T weakly developed. Pygidial plate with distinctly elevated, apically pointed triangular area in the middle. S densely tesselate shiny to weakly dull. S2 with completely distinct punctation (1), S3–5 with impunctate basal zone on disc and distinct punctation (1) laterally. S6 triangular, with large punctation apically.

Integument colour. Proboscis dark brownish. Mandibles apically dark reddened. AS 5– AS 12 black dorsally, dark brownish on underside. Other parts of head, as well as thorax blackish. Tegulae brownish transparent. Veins of wings yellowish brown to dark brownish, stigma brownish. Front and mid leg black to blackish brown. Coxa to femur of hind leg black to blackish­brown, tibia and basitarsus bright yellowish­brown to orange. Distal tarsal segments brownish. Claws of all legs yellowish­brown basally, dark reddish apically. T1–5 black, except yellowish­brown transparent marginal zone. Elevated triangular area of pygidial plate reddish­brown, except blackish­brown tip. Marginal zone of pygidial plate apically blackish­brown, basally slightly reddish­brown. S blackish except yellowish­brown transparent marginal zone.

Pubescence. Labrum with medium­long yellowish­brown hairs. Clypeus along apical margin with medium­long to long yellowish­brown hairs, on disc nearly bare, area along lateral and basal margin with yellowish­grey pubescence of medium­long to long branched hairs. POA, SCA, dorsal side of scape, as well as main parts of vertex and GA with yellowish­grey, long hairs. Pubescence along inner margin of FOV, main parts of frons and area along upper and hind margin of compound eyes consisting of dark brownish to blackish­brown hairs. FOV reddish­brown, when seen from above. Thorax with bright yellowish­grey pubescence, especially long on scutellum and metanotum. PT bare, DLP with yellowish­grey hairs. Dorsal fringe of propodeal corbicula with long, branched yellowish­grey hairs. LP with few simple, yellowish­grey hairs. Pubescence of legs mainly yellowish­grey. Flocculus of trochanter of hind leg rather short, sparse. T1 with long, sparse pubescence of greyish hairs. T2–4 with greyish hairs, hairs longest and most dense on marginal zone, forming distinct apical hair fringes. Prepygidial (T5) and pygidial (T6) fimbria brownish. S2–6 with sparse yellowish­grey pubescence forming weak fringe along apical margin.

Male. BL: 6.8–9.0 mm (7.8 mm). FWL: 5.7–6.6 mm (6.2 mm).

Structure. As in female except for usual secondary sexual characteristics and as follows: Head oval, 1.2 times broader than long in frontal view. Mandibles long, falciform, distinctly bidentate. PLR large and shiny, 1.2 times broader than long. Apical margin of PLR with weak emargination in the middle. Clypeus more shiny than in female, especially in lower part. POA more shiny than in female. GA about 1.3 times as wide as compound eye seen in profile. Vertex slightly longer than in female, distance from hind margin of LO to hind margin of vertex distinctly wider than OD. Scape nearly as long as following three segments together. AS 3 nearly twice as long as broad, as long as AS 4 and AS 5 together. AS 4 slightly shorter than broad, AS 5 as long as broad. AS 6– AS 12 distinctly longer than broad, AS 13 about twice as long as broad. T less tesselate than in female, therefore more smooth and shiny, with minute punctation. S tesselate, shiny with large distinct punctation. S7 and 8 as shown in Figs 3 D and I. Male genitalia as in Fig. 5 A.

Integument colour. Mandibles apically reddened. Antenna completely black. Apical part of tibia and basitarsus of hind leg mostly bright yellowish­brown. All other parts of body black to blackish­brown.

Pubescence. Head with long greyish to yellowish­grey pubescence except row of brown to blackish­brown hairs around compound eye. Pubescence of thorax less colourful than in female, more greyish. Pubescence of T greyish, more sparse and shorter than in female, only fresh animals with indication of apical hairbands. S with sparse, short to medium­long greyish hairs forming weak apical fringes in the middle.

Diagnosis. By the following characters A. yangi is placed in subgenus Euandrena: Characteristic shape of male genitalia, S7 and S8; penis valve slender, without lateral lamella; gonocoxite without strongly developed dorsal lobe; dark­coloured clypeus in the males; propodeal corbicula of females without anterior hair fringe; LP of females with few simple hairs. Within Euandrena the new species is most similar to A. (Euandrena) takachioi Hirashima, 1964 from Japan, from which it can be distinguished by following characters (characters of A. takachioi given in parentheses): Female. FOV extremely broad, distance between LO and FOV 0.5 times OD (FOV distinctly narrower). Vertex strongly tesselate, dull to weakly shiny (weakly tesselate, distinctly shiny). Structure of DLP as fine or even finer than those of PT, without rugous punctation (structure of DLP distinctly stronger than PT, with strong rugous punctation). Propodeal triangle granulate, with short and distinct wrinkles basally (granulate, partly extremely fine rugously structured). T strongly tesselate with inconspicuous, weak punctation (weakly tesselate, more shiny, with distinct punctation). Hind tibia bright yellowish brown to orange (blackish brown). Frons and POA with distinct brown pubescence (pubescence yellowish­grey). Pubescence of scutum, scutellum and metanotum extremely pale, bright yellowish­grey to grey (pubescence distinctly yellowish). Male gonostylus long (short). From all other Taiwanese species of Andrena the new species is easily differentiated in both sexes by the yellowish­brown tibia and basitarsus of hind leg and by the rather long AS 3 in the male, which is nearly twice as long as broad.

Etymology. This species is named in honor of Prof. Dr. Jeng­Tze Yang for his valuable contributions to the insect taxonomy of Taiwan and his generous support during the author’s two collecting trips to Taiwan.

Type material. Holotype: Ψ, Taiwan ( ROC), Hualien Hsien, Tayuling, 2560 m, 12.–15.IX.1980, leg. K. S. Lin & C. H. Wang ( TARI). Paratypes: 1 ɗ, same data as holotype; 1 Ψ, Taiwan ( ROC), Nantou Hsien, Tsuifeng, 2300 m, VIII.1984, Malaise trap, leg. K. S. Lin & K. C. Chou ( TARI); 1 ɗ Taiwan ( ROC), Nantou Hsien, Tsuifeng, 2300 m, 27.VIII.1981, leg. L. Y. Chou & S. C. Lin ( TARI); 1 ɗ Taiwan ( ROC), Nantou Hsien, Tsuifeng, 2300 m, 1.–3.VIII.1981, leg. T. Lin & W. S. Tang ( TARI); 1 Ψ, Taiwan ( ROC), Nantou Hsien, Tsuifeng, 2300 m, IX.1984, Malaise trap, leg. K. S. Lin & K. C. Chou ( TARI); 1 Ψ, Taiwan ( ROC), Nantou Hsien, Tsuifeng, 2300 m, XI.1984, Malaise trap, leg. K. S. Lin & K. C. Chou ( TARI); 1 Ψ, Taiwan ( ROC), Nantou Hsien, Tsuifeng, 2300 m, IX.1985, Malaise trap, leg. K. S. Lin & K. C. Chou ( TARI); 1 ɗ Taiwan ( ROC), Nantou Hsien, Tsuifeng, 2300 m, 12.–14.IX.1984, leg. K. S. Lin & S. C. Lin ( TARI); 1 Ψ, Taiwan ( ROC), Nantou Hsien, Tungpu, 1200 m, IX.1985, Malaise trap, leg. K. S. Lin ( TARI); 1 ɗ, Taiwan ( ROC), Nantou Hsien, Meifeng, 2150 m, XI.1984, Malaise trap, leg. K. S. Lin & K. C. Chou ( TARI).

Figures

FIGURE 2. Head and head structures, part II. A: Profile of male of A. nantouensis sp. n.; B: Portrait of female of A. yangi sp. n.; C: Dorsal view of female head of A. yangi sp. n.; D: Left FOV of female of A. yangi sp. n. Dotted lines in Figs C and D indicate outline of FOV. Scale bars: 250 µm.

FIGURE 5. Male genitalia, part II, left dorsal, middle lateral and right ventral view. A: A. yangi sp. n.; B: A. nantouensis sp. n.; C: A. cheni sp. n. Scale bars: 250 µm.

FIGURE 3. S 7 (A – E, ventral side) and S 8 (F – K) of male. A: A. heinzi sp. n.; B: A. planti sp. n.; C: A. susanneae sp. n.; D: A. yangi sp. n.; E: A. cheni sp. n.; F: A. heinzi sp. n. (dorsal side); G: A. planti sp. n. (ventral side); H: A. susanneae sp. n. (left dorsal, right ventral side); I: A. yangi sp. n. (left dorsal, right ventral side); J: A. nantouensis sp. n. (left dorsal, right ventral side); K: A. cheni sp. n. (left dorsal, right ventral side). Scale bars: 250 µm.