Ctenanthidium nigripes Urban 1993
Creators: name: Parizotto, Daniele R.
name: Urban, Danúncia
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Megachilidae
Ctenanthidium
Ctenanthidium nigripes

description: Ctenanthidium nigripes Urban, 1993
(Figs. 11–12, 23)
The original description of this species was based on a single female from Bolivia, Potosi. The male described below is from Bolivia, Cochabamba.
Comments and diagnosis. Integument of mesoscutum smooth, with two anterior yellow bands; each side of vertex with one yellow spot (Fig. 12). Female: metasoma with yellow bands on T1, T3-T5 (Fig. 21). This species is very similar with C. argentinum differing by the metasoma with shallower, smaller and sparser punctures. Ctenanthidium nigripes also differs by the presence of only two yellow bands on metasoma while C. argentinum has the metasoma with four yellow bands.
Description male. Approximate body length 6.1 mm; forewing length 5.2 mm; head width 2.0 mm; eye length 1.3 mm. Color: Integument black except yellow as follows: mandible except teeth and margins; clypeus with subapical macula, wider at middle; supraclypeal area with U-shaped macula including juxtantennal carina; lower paraocular area, narrowing near antennal sockets. One spot on each side of vertex, behind eyes. Antenna with scape, pedicel and first two basal segments amber; pedicel blackened dorsally (Fig. 11). Mesoscutum with an anterior band on each side, wider near middle; axilla and scutellum with subapical band and translucent margin. Tegula amber, wing membrane blackened, veins black, darker at base and at costal margin (Fig. 12). Legs with coxae, trochanters and basal half of femora blackened; fore leg with femur amber on external surface and apex; middle and hind legs with apices of femora, tibiae and tarsomeres amber. Terga black; T1 with large yellow band, slightly narrow at middle; T2 with yellow lateroventral macula; T3-T5 with discal yellow band, distal half of terga yellowish amber with translucent margin, larger on T3; T6-T7 with marginal yellow band (Fig. 23). S1 with lateral spots; S2 with apical half yellow and stained by two discal black spot; S3 with two large lateral yellow spots and translucent medial margin.
Pilosity. Predominantly white, hairs longer than ocellar diameter, sparser and longer on paraocular area, clypeal apex, scutellar apex, sides of terga, sterna and legs. Second and third sterna with apical fringe of plumose hairs laterally.
Punctures. Head and mesosoma densely punctate; punctures on metasoma shallower and sparser than in mesosoma. Punctures of first and second terga sparser and smaller than in the remaining terga.
Material examined. One male: “ BOLIVIA, Cochabamba:/ Peña Colorada, 1800m./ February 21,1976/ L. E. Peña” (AMNH); ARGENTINA: one male, Jujuy, Tumbaya, II/84, Fritz; one male and one female from Salta, El Maray, I/94, Fritz (AMNH); one female from Salta, Cuesta, Obispo, II/85 (AMNH); one male and one female from Salta, Chorrillos, III/93 (AMNH); one male from El Alisal, III/93 (DZUP) and one female from El Alisal III/94, Fritz, (DZUP).
Variation. In the other males examined following variations in the supraclypeal area were noted: the specimen from El Alisal has a U-shaped macula, including the juxtantennal carina; the male from El Maray has a yellow spot near the epistomal sulcus; the male from Tumbaya has a small yellow band near the epistomal sulcus. Females differ from holotype by having larger ferruginous areas.
Key to the species of Ctenanthidium
1 Mesoscutum dull, with dense microreticulation between punctures............................................... 2
- Mesoscutum shiny and smooth between punctures........................................................... 3
2 Mesoscutum black. Female: metasoma with yellow bands on T1 and T3 only; T2 with sparse punctures on disc, punctures separated by a puncture diameter (Fig. 20)......................................................... C. bifasciatum
- Mesoscutum with yellow maculae. Female: metasoma with yellow bands on T1, T3-T5, respectively; T2 with dense punctures on disc, punctures separated by half of a puncture diameter (Fig. 21)................................ C. gracile Urban
3 Tegula with sparse and shallow punctures laterally, smooth on disc (Fig. 16). Head and mesosoma black with yellow and orange maculations (Figs. 8–9). Mesoscutum with a reversed L-shaped maculae, yellow dorsally and ferruginous laterally (Fig. 13–14). Female: labrum with thickened subapical hairs (Fig. 10)........................... C. versicolor sp. nov.
- Tegula with dense and deep punctures on sides, smaller and sparser on the disc (Fig. 15). Head and mesosoma black with yellow maculae, sometimes with a small ferruginous spot behind eyes (Fig. 11–12). Female: labrum with apical hairs......... 4
4 T2-T3 with shallow, small and sparse punctures, distance between punctures as wide as half of puncture diameter. Female: metasoma with yellow bands on T1, T3-T5 (Fig. 21). Male: sides of mesepisternum with long plumose hairs (> 2 PD)............................................................................................ C. nigripes Urban
- T2-T3 with deep, bigger and dense punctures, distance between punctures less than a half of puncture diameter. Female: metasoma with yellow bands on T1 and T3 only (Fig. 19–20). Male: sides of mesepisternum with short plumose hairs (≤ 1.5 PD).................................................................................... C. argentinum Urban
description: Published as part of Parizotto, Daniele R. & Urban, Danúncia, 2013, Contribution to the knowledge of the Anthidulum Michener and Ctenanthidium Urban (Hymenoptera, Apidae) with new species from Argentina and Peru, pp. 311-318 in Zootaxa 3609 (3) on pages 316-317, DOI: 10.11646/zootaxa.3609.3.5, http://zenodo.org/record/218946