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Tetraloniella fastigiata LaBerge, 2001
Life   Insecta   Hymenoptera   Apoidea   Apidae   Tetraloniella


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Identification
Extracted from: Wallace E. LaBerge. 2001. Revision of the bees of the genus Tetraloniella in the New World (Hymenoptera: Apidae). Illinois Natural History Survey Bulletin 36(3):67–162.

This is a small pale species related to T. donata Cresson but both sexes have the dull thoracic dorsum with much smaller, close-set punctures and have the galeae opaque above, dulled by dense fine tessellation, with lateral surfaces more or less shiny. The female of fastigiata is much paler than that of donata and has no dark brown hairs on vertex or thoracic dorsum. The male of fastigiata has the clypeus, labrum, and base of mandibles pale cream-colored to white, unlike the black-faced donata male.

FEMALE. Measurements and Ratios.- N = 20; length, 8–10 mm; width, 3–4 mm; wing length, M = 2.19±0.065 mm; hooks in hamulus, M = 10.7±0.193; flagellar segment 1/2, M = 1.94±0.035.

Integumental Color.- Black except as follows: mandible rufescent medially, often with gold macula near apex; flagellar segments 3–ll orange to red below, segments 1 and 2 dark reddish brown; tegulae testaceous; wing membanes hyaline, veins reddish brown to red; terga piceous, apical areas with extremely narrow rims translucent; sterna 2–5 with apical areas with narrow hyaline margins, rufescent basally, basal areas rufescent to piceous; distitarsi rufescent; tibial spurs testaceous.

Structure.- Clypeus sculptured as in donata but often with short apicomedial elevated line or small boss. Supraclypeal area with crowded punctures about as large as on clypeus or slightly smaller. Face above antennal fossae with crowded punctures slightly smaller than clypeal punctures, surface moderately shiny. Vertex with lateral flattened area with minute, deep punctures separated by about half a puncture width, moderately shiny. Genal area punctured as in vertex lateral area, moderately shiny. Galea above opaque, with dense, fine tessellation on entire length, lateral surfaces shiny to moderately shiny; maxillary palpal segments 5, ratio about as 1.0:0.8:0.8:0.5:0.4. Flagellar segment 2 distinctly shorter than broad, segments 3–9 mostly about as broad as long. Mesoscutum with anterior half or more with small, round, dense, shallow punctures separated by mere ridges, posteromedial area slightly more sparsely punctate, surfaces dulled by fine shagreening. Scutellum similar but punctures generally smaller. Propodeum with dorsal area punctures relatively small, round, dense except in narrow median area, surface dull, shagreened; posterior surface with upper triangle punctate laterally, leaving a small median impunctate area. Mesepisternum with small, round, crowded punctures similar to mesoscutal punctures, surface moderately shiny, bottoms of punctures shinier than mesoscutal punctures. Pterostigma slightly shorter than prestigma. Metasomal terga 1–5 sculptured as in donata. Pygidial plate Vshaped with rather pointed apex. Sterna 2–6 sculptured as in donata.

Vestiture.- Pale ochraceous except as follows: vertex and dorsum of thorax usually dark ochraceous, never dark brown as in donata, metasomal terga similar to donata but tergum 2 with posterior margin of apical fascia not brace-shaped, evenly curved from side to side; terga 3 and 4 with interband zones with abundant pale pubescence, although dark brown at least laterally on tergum 3; tergum 2 usually with interband zone entirely dark or with relatively few pale hairs in median half; terga 5 and 6 entirely ochraceous to brown with large lateral patches of ochraceous hairs and often tergum 5 with a small median pale patch; sterna with basal hairs dark brown to redbrown, apical margins with pale ochraceous hairs. Tibial scopal hairs simple, white; inner surface tarsi with yellow to red hairs.

MALE. Measurements and Ratios.- N = 20; length, 2.5–3.0 mm; width, 7.5–9.0 mm; wing length, M = 2.17±0.110 mm; hooks in hamulus, M = 10.25±0.123; flagellar segment 2/1, M = 8.82±0.182.

Integumental Color.- Black except as follows: clypeus white to cream-colored, often with posterior margin narrowly infuscated; mandibles with basal white maculae; labrum white or pale cream-colored; flagellar segments 2–11 orange to red below, reddish brown above, segment 1 brown; tegulae testaceous, yellow; wing membranes hyaline, veins red to reddish brown; metasomal terga 1–6 piceous as in female but apical translucent rims slightly wider; sterna 2–6 as in female but apical areas hyaline, colorless to slightly reddened at base; distitarsi red-brown; tibial spurs testaceous.

Structure.- Head sculpture much as in female but clypeal punctures less distinct; galeae dulled above as in female; mesoscutal sculpturing as in female but posteromedial area occasionally moderately shiny; scutellum, propodeum, and mesepisterna sculptured as in female; pterostigma shorter than prestigma; metasomal terga 1–5 sculptured as in female; pygidial plate similar to that of donata; sterna 2–5 sculptured as in female. Sternum 6 (Fig. 97) as in donata, note apicolateral shoulders, unlike donata, and hair pattern.

Terminalia (Figs. 97–100) much as in cressoniana but sternum 7 (Fig. 98) with apicomedian plates lack sharp points apically, with few apical hairs and sternum 8 (Fig. 99) deeply emarginate apicomedially with extremely sparse hairs. Genital capsule as drawn (Fig. 100).

Vestiture.- Generally white to pale ochraceous with exceptions as follows: vertex and thoracic dorsum often dark ochraceous never dark brown; metasomal tergum 1 with apical half with short subappressed dark brown hairs, long pale hairs basally; terga 2–4 with basal pale tomentum, interband zone with brown hairs but occasionally some white pubscence mixed medially to mostly ochraceous; tergum 2 with apical pale band often narrowly interrupted medially; terga 5 and 6 usually with brown hairs basally and ochraceous laterally (usually across apex in tergum 5) but may be entirely ochraceous; tergum 7 pale to dark brown or mixed. Metasomal sterna 1–5 usually entirely pale but sparser median hairs often reddish brown, sternum 6 with short sparse hairs usually brown; inner surfaces hind basitarsi with pale hairs.


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Updated: 2024-03-28 08:34:33 gmt
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