Pachyanthidium (Trichanthidium) nigrum Pasteels
Creators: name: Eardley, Connal
name: Griswold, Terry
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Megachilidae
Pachyanthidium
Pachyanthidium nigrum

description: Pachyanthidium (Trichanthidium) nigrum Pasteels
(Figs 12–13)
Pachyanthidium (Trichanthidium) nigrum Pasteels, 1984: 152, male holotype (RMAC) Ivory Coast.
Diagnosis. The almost entirely black integument, including the dark lamella of the vertex, scutellum and terga distinguish P. nigrum from all other Afrotropical Pachyanthidium. Other diagnostic features include ventral longitudinal carina on the mid femur, nearly opaque lamellae, male T6 dorsolaterally with only slight, non-angulate lobes, and male T7 with broad, scarcely angled lateral projections.
Description. FEMALE. Lengths: head 3.5 mm; scutum 2.1 mm; forewing 7.6 mm; body 7.0 mm. Body black with extensive orange maculations on vertex, clypeus, mandible (Fig. 12 a), mesepisternum, legs, axilla, scutellum (short subapical cross-band), lateral marks on T1–T5, entire T6, S6 (Fig. 12 b). Structure. Preoccipital lamella distinct (longer than median ocellus diameter); eye hairy; clypeus ventral edge straight, weakly crenulate; mandible spatulate, 2 broad outer teeth, 2 very small inner teeth; lateral margin of scutum slightly lamellate; pronotal lobe strongly lamellate; omaulus strongly lamellate; forebasitarsus short and narrow, length 0.6x foretibia, width 0.3x lengths; arolia absent; T2–T5 with lateral spines, T6 gently swollen laterally, without spine, truncate posteriorly (Fig. 12 c).
MALE. Lengths not available. Body black or blackish with clypeus and mandible yellow, tiny maculations sometimes present sublaterally on T2–T5, T6 apicolaterally (Fig. 12 d, e). Structure. Preoccipital ridge distinctly lamellate; eye hairy; supraclypeus slightly raise; subantennal suture bowed gently outward (inconspicuous); antennal flagellum length 1.3x eye length, 4.5x scape length; clypeus ventral edge straight, smooth; mandible 3- toothed; forebasitarsus sparely pubescent, not distinctly fringed, length 0.6x foretibia length, 2.5x its width, anterodistal extension not visible; hind basitarsus narrow, width one-third length; arolia absent; T1 unmodified laterally; T2–T6 each with small posterolateral spine; T6 one plane, extended posteromedially, posterior edge entire; T7 broad, with broad, rounded posterolateral projection, low, pointed posteromedian spine (Fig. 12 f); terminalia not studied.
Distribution. Pachyanthidium nigrum is known from Ivory Coast, Gabon, and South Africa (Fig. 13).
Material examined. Type material. Male holotype of Pachyanthidium nigrum: ‘ COTE D’IVOIRE Mt Tonkui, 1189m 30.xii.1979 A.Pauly réc, COLL. MUS. TERVUREN Don J. Pasteels, Pachyanthidium (Trichanthidium) nigrum n.sp. J. Pasteels det., 1982, HOLOTYPUS’, RMAC.
Additional material. Gabon. Dyanga, 1986. i.27, A. Pauly (1♀ RBINS); Ogooué-Ivindo Dist., Forêt des Abeilles, Makandé, 1995.x–xi, D. Roubik (3♂ BBSL). South Africa. Manzengwenya, 1980. xii.7, D. H. Jacobs (1♀ SANC).
description: Published as part of Eardley, Connal & Griswold, Terry, 2017, Taxonomic revision of the Afrotropical species of Pachyanthidium Friese (Hymenoptera: Megachilidae: Anthidiini), pp. 401-453 in Zootaxa 4237 (3) on pages 420-422, DOI: 10.11646/zootaxa.4237.3.1, http://zenodo.org/record/344704