Chlerogella silvula Engel, 2010

Engel, Michael, 2010, Revision of the Bee Genus Chlerogella (Hymenoptera, Halictidae), Part II: South American Species and Generic Diagnosis, ZooKeys 47 (47), pp. 1-100 : 54-57

Chlerogella silvula Engel , sp. n.

urn:lsid:zoobank.org:act:5912B372-09EA-48B7-9D05-A6FA2FE1AF7E

Figs 84–86, 90–91, Map 3

Holotype. ♁, ECUADOR: Napo, Muyuna , 500 m, 5 km W. of Tena, 23.iv.1981 [23 April 1981], M. Cooper ( COOP).

Paratype. ECUADOR: ♁, Napo, Muyuna, 500 m, 5 km W. of Tena, 20.iv.1981 [20 April 1981], M. Cooper ( COOP).

Diagnosis. This species is very close to C. octogesima (Brooks and Engel) differing from that species by the more diffuse setae on SIII and SIV (developed into more dense fringes in C. octogesima ), by the distinctly and greatly elongate diffuse apicolateral setae on SV (such elongate setae absent in C. octogesima ), by the ventral fringe of setae on the ventral gonostylar process being elongate and not greatly thickened (Fig. 91) (decreasing in length to very short apically on ventral gonostylar process in C. octogesima , these same setae are distinctly thickened and curved, almost hooked, at their apices), and by the presence of greatly elongate setae dorsoapically on the penis valves (not present in C. octogesima ).

Description. Male: Total body length 6.47–6.54 mm; forewing length 4.53– 4.60 mm. Head length 1.74–1.80 mm, width 1.25–1.28 mm. Clypeus beginning slightly above lower tangent of compound eyes. Malar space 11.6–13.9% compound eye length (malar length 0.13–0.16 mm; compound eye length 1.12–1.15 mm) (Figs 85–86). Upper interorbital distance 0.63–0.64 mm; lower interorbital distance 0.30–0.34 mm. First flagellomere about as long as pedicel, about as long as wide; second flagellomere 2.8 times length of first flagellomere; ventral surfaces of second through eleventh flagellomeres densely covered in placoid sensilla, placoid fields not disrupted. Upper portion of pronotum medially depressed, not elongate, medially less than 0.25 times ocellar diameter in length; ventral portion of preëpisternal sulcus not broad, similar to scrobal sulcus and upper portion of preëpisternal sulcus; intertegular distance 0.83–0.94 mm; mesoscutellum weakly convex, not bigibbous. Basal vein distad cu-a by three times vein width; 1rs-m distad 1m-cu by four times vein width; 2rs-m distad 2m-cu by five times vein width, 2rs-m straight; first submarginal cell longer than combined lengths of second and third submarginal cells; second submarginal cell not narrowed anteriorly, anterior border of second submarginal cell along Rs slightly shorter than that of third submarginal cell; posterior border of third submarginal cell slightly more than two times longer than anterior border. Distal hamuli arranged 2-1-2. Inner metatibial spur minutely ciliate. Apical margin of SIII entire; apical margin of SIV entire, without furrow in apical half

Figures 84–86. Holotype male of Chlerogella silvula sp. n. 84 Lateral habitus 85 Facial aspect 86 Lateral aspect of head.

of disc; apical margin of SV entire; apical margin of SVI emarginate; terminalia as depicted in figures 90 and 91.

Clypeus and supraclypeal area faintly imbricate with weak punctures separated by 0.5–1.5 times a puncture width; face with small, contiguous punctures, more widely spaced in malar space; punctures of face blending to smooth integument in ocellocular area and vertex, with punctures separated by 1–2.5 times a puncture width; gena smooth with small punctures separated by 1–3 times a puncture width; postgena imbricate and impunctate. Pronotum smooth with scattered minute punctures; mesoscutum smooth with small punctures separated by 1–2.5 times a puncture width; mesoscutellum smooth with small punctures separated by 1–2 times a puncture width; metanotum smooth with minute punctures separated by 1–3 times a puncture width.

Figures 87–9Ι. Male terminalia for some Ecuadorian Chlerogella species. 87 Chlerogella cooperella sp. n., hidden and fused sterna VII and VIII 88 Detail of volsella for C. cooperella sp. n. 89 C. cooperella sp. n., genital capsule (left is dorsal aspect, right is ventral aspect) 70 C. silvula sp. n., hidden and fused sterna VII and VIII 7Ι C. silvula sp. n., genital capsule (left is dorsal aspect, right is ventral aspect). All scale bars = 1 mm.

Preëpisternum smooth with small punctures separated by 2–5 times a puncture width; mesepisternum smooth with small punctures separated by 2–6 times a puncture width; metepisternum smooth. Propodeum strongly imbricate. Metasoma weakly imbricate.

Mandible yellow except reddish at apex; labrum yellow; clypeal apex yellow, remainder of clypeus and head brilliant metallic green, with copper highlights, coloration more bluish on vertex. Antenna brown except scape largely yellow. Mesosoma brilliant metallic green, with copper highlights (Fig. 84), coloration more blue on mesosomal dorsum; pronotal lobe amber; tegula amber. Wing membranes lightly infumate; veins brown. Legs amber. Metasoma dark brown except SI–III amber, TI–III largely amber except brown on apical margin TI, apical third TII, and apical half TIII, tergal margins translucent brown.

Pubescence white. Typical gender pilosity except postgena with elongate, sinuate setae, such setae with short apical branches and more dense anteriorly; inner surfaces of trochanters, mesofemur, and metacoxa with elongate, apically-plumose setae, similar setae on inner surfaces of metatibia except simple and somewhat sinuate. Apical margin of SIII–V laterally with diffuse patches of long setae, those on SV particularly elongate.

Female: Unknown.

Etymology. The specific epithet is a diminutive of the Latin term silva, meaning “forest”.