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Andrena lamelliterga Ribble, 1968
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Micrandrena

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Reprinted with permission from the University of Nebraska State Museum from: Ribble, D. W. 1968. Revisions of two subgenera of Andrena, Micrandrena Ashmead and Derandrena new subgenus (Hymenoptera: Apoidea). Bulletin of the University of Nebraska State Museum 8: 1-124.

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The name of this species refers to the broad apical margins of the abdominal terga (most noticeable in the female). Timberlake indicated the distinctness of lamelliterga by placing a manuscript name on a specimen. Other specimens are identified as personata, salictaria and ziziae. Andrena lamelliterga most closely resembles ziziae.

Both sexes of lamelliterga have sharply pointed galeae and moderate sized pterostigmata. The male has a cream-colored clypeus and unmaculated parocular areas. The antennae are dull and the flagellar segments (except for the basal and ultimate segments) are about the same size and shape. In ziziae these segments become increasingly larger toward the apex. The female has broad apical lamellae on the abdominal terga; the lamellae extend nearly as far posteriorly as the apical fascial hairs. The hind tibia is broadened and has scopal hairs of moderate length.

FEMALE. MEASUREMENTS AND RATIOS. Length, 6.5 mm; width of mesothorax, 2.0 mm; wing length from tegula, 4.8 mm; facial length/width, 0.98; foveal length/width, 3.40.

INTEGUMENTAL COLOR. Chocolate brown to brown except: dorsum of thorax with slight golden reflections, abdomen with bluish-black reflections; flagellum orange-brown below; tegula amber; terga with broad amber apices, apex of tergum 2 (and to a lesser extent 3 and 4) very broad, bare except basally, apical fasciae barely reaching beyond apical margin, broadly but slightly emarginate in center; sterna with narrower amber apices; color otherwise as in piperi.

STRUCTURE. Sculpturing in general finer over entire body than in piperi. Head otherwise as in piperi except: scape nearly as long as flagellar segments 1-5; flagellar segment 1 slightly shorter than 2 and 3 together; middle segments as wide as long; eye about four times as long as broad in anterior view; galea sagittate, with outer margin expanded below palpus, then (along with inner margin) tapering to a sharp point; maxillary palpus with segments in ratio of about 1.8:1.8:1.4:1.4:1.0:1.2, palpus exceeding galea by one and one-half segments; labial palpus with segments in ratio of about 4.0:1.5:1.0:1.2, segment 1 slightly curved, not tapered; labral process one-third as wide and half as long as entire labrum, apex slightly emarginate; genal area in lateral view as wide as eye; vertex extending past lateral ocellus by half ocellar width; surface between ocelli only slightly rougher than surface above facial fovea, not more shiny; facial fovea barely reaching upper eye margin.

Mesosoma as in piperi except: posterior and dorsolateral areas of propodeum not raised above enclosure, with shagreening like enclosure; hind tibia broadened, nearly twice as wide as basitarsus; wings with pterostigma moderately large; first transverse cubital vein ending several widths from pterostigma.

Metasoma as in piperi except pygidial plate without edges turned upward, center slightly raised.

VESTITURE. Hairs as in piperi except: dorsum of thorax with slightly less moss-like appearance; terga 2-4 hairs (except for apical fasciae) weakly branched, scattered, abdomen without dusty appearance; apical fasciae reduced to a few lateral hairs on tergum 1; tibial scopal hairs moderate in length.

MALE. MEASUREMENTS AND RATIOS. Length, 5.8 mm; width of mesothorax, 1.4 mm; wing length from tegula, 4.3 mm; facial length/width, 1.04; flagellar segment 1/segment 2, 1.21.

INTEGUMENTAL COLOR. Black to dark brown except: dorsum of thorax with blue-black reflections; clypeus cream-colored; flagellum orange-yellow below; color otherwise as in lamelliterga female.

STRUCTURE. Sculpturing in general finer over entire body than in piperi. Head otherwise as in piperi except: scape reaching to within one and one-half ocellar distances of medium ocellus, as long as flagellar segments 1-3; segment 1 slightly longer than 2, as long as 3; eye four times as long as broad in anterior view; maxillary palpus with segments in ratio of about 1.6:1.8:1.6:1.0:1.0:1.2; labial palpus with segments in ratio of about 5.0:1.7:1.0:1.7; labrum slightly less than three times as wide as long; process about two-thirds as wide as entire labrum, much expanded towards base; clypeus slightly more than one and one-half times as broad as long; genal area slightly narrower than eye.

Mesosoma as in lamelliterga female.

Exposed metasoma as in piperi.

Sternum 7 distinctly emarginate at apex, producing two large, rounded lobes, each lobe bearing several, long, weakly branched setae (fig. 34). Sternum 8 (fig. 35) much like piperi except basal plate smaller, shaft longer. Gonocoxite bent slightly downward; apex slightly expanded in lateral view; dorsolateral part with many weakly branched setae; dorsal lobes moderate in size. Penis valve bent downward, apex narrowly rounded in lateral view; medially moderately expanded (figs. 31-33).

VESTITURE. Hairs as in piperi except apical abdominal fasciae absent on tergum 1, interrupted on terga 2 and 3, complete on 4.

VARIATION. The few specimens known of this species, from six different localities, undoubtedly do not well represent the variation. However, two trends appear: the specimens from the eastern part of the range are smaller and the males have the lateral margin of the gonoforceps more expanded in dorsal view. One male (paratype) has a cream-colored spot on the supraclypeal area.

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Updated: 2021-06-15 07:50:29 gmt
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