taxonID	type	description	language	source
7F05A52C51B05933BD2E50C2F8F656C7.taxon	diagnosis	Diagnosis. The female of Megachile lucifer is distinguished from all other species of Hackeriapis by the presence of a pair of upward and outward projecting triangular horns on the sides of the clypeus, with a deeply impressed clypeus featuring a slightly raised medial ridge. The clypeal horns, each measuring 0.9 mm in length, are almost half as long as the head width in profile (Fig. 1 a – c). The male is distinguished from other Hackeriapis by the carina of T 6 being bilobed, each lobe emarginate. The presence of clypeal processes suggests that Megachile lucifer should be part of King’s “ Species-group 2 ” of Hackeriapis (M. patera King, 1994, M. bicornis King, 1994, M. franki Friese, 1920, M. semicandens Cockerell, 1910, M. monkmani Rayment, 1935), however, unlike King’s “ Species-group 2 ”, the mandible is not deeply emarginate between Te 3, Te 4, nor is the polished medial plate flat, which according to King’s key would place M. lucifer with “ Species-group 1 ” (King 1994). The clypeal horns of M. lucifer are most similar to M. bicornis and M. patera, however the horns project more upward, there is a medial ridge in the clypeus, and the metasoma is not completely orange. The male of M. lucifer differs from M. bicornis in its metasomal colouration, and each lobe of the carina on T 6 is emarginate (the male of M. patera is unknown).	en	Prendergast, Kit S., Campbell, Joshua W. (2025): Megachile (Hackeriapis) lucifer (Hymenoptera, Megachilidae), a new megachilid with demon-like horns that visits the Critically Endangered Marianthus aquilonaris (Pittosporaceae). Journal of Hymenoptera Research 98: 1017-1030, DOI: 10.3897/jhr.98.166350
7F05A52C51B05933BD2E50C2F8F656C7.taxon	description	Description. Female (Fig. 1): Dimensions: Total body length 9.80 mm, HW 3.56 mm, ITS 2.68 mm. Colouration: Non-metallic black; integument of head black; clypeal horns black; mesosoma black; metasoma black; red-brown border on tergites; legs black, final tarsi brown; wings dusky, semi-opaque with wing veins very dark brown; microtrichia especially dark under radial vein of the marginal cell on the forewing; scape, pedicel, F 1 dark brown, remainder brown, mandibles black with red Te 1 and Te 2. Pubescence: Long white pubescence on face around antennal sockets covering paraocular area and gena, along underside of mandibles, sides of thorax, and metanotum; dense white hairs on base of mandibles; very sparse fine gold hairs short on scutum, short thick gold hairs along cutting edge of mandibles; short white hairs along legs; posterior hairbands on terga present on T 1 - 4, colour of hair bands white; T 1 with thick, dense lateral patch; hairbands on T 1 and T 4 very short and sparse, hairbands on T 2 - 3 complete and about one-fifth of tergite width; T 5 – T 6 pubescence on orange-gold; sparse long white hairs on T 1; metasomal scopae cream. Sculpture: Head, mesoscutum, and scutellum with large, deep, close punctures; antennal scape with fine, shallow punctures; propodeal triangle with small, shallow punctures (Fig. 1 c); terga with minute, shallow, close punctures. Structure head: face wider than long (1.6 ×); distinct pair of horns on clypeus, triangular in shape, projecting out and slightly up, with pointed tips rounded at the apex, convex on ocular side, inner face deeply concave medially, clypeus has medial vertical ridge with a small protuberance at the base of the clypeus, strongly depressed, hollowed out and concave on each side of the central ridge and horns (Fig. 1 b); supraclypeal area slightly elevated and concave; malar space present; mandibles relatively large, with blunt edges, four teeth (three above the notch in along the preapical margin), distance from Te 4 to Te 3, is greater than from Te 3 to Te 2, and length of teeth decreases from Te 1 to Te 4, preapical margin almost vertical (Fig. 1 b); gena ca. 0.4 × as wide as compound eye viewed laterally; scape not attaining median ocellus; scape 0.75 mm long, with apex approx. 1.5 × broader than base, last five flagellomeres longer than wide, F 3 - 5 equal, pedicel and F 1 - 2 longer than wide; final flagellomere wedge-shaped such that it tapers apically, total length of flagellum (pedicel and flagellomeres) 2.09 mm. Head measurements: HL 2.1 mm; gena width 0.86 mm; clypeus length 0.59 mm; UID 2.5 mm; LID 2.53 mm; IAD 0.92 mm; OOD 0.63 mm; IOD 0.65 mm; AOD 0.67 mm; OAD distance 0.53 mm; malar space 0.08 mm; mandible base length 0.67 mm; mandible length 1.5 mm; UID: LID 0.99; clypeus: HL 0.28. Mesosoma: Propodeal triangle slightly convex, carina weak, almost vertical. Mesosoma measurements: overall mesosoma length 3.54 mm; pronotal collar absent; mesoscutum length 2.28 mm; scutellum length 0.73 mm; mesoscutum length: ITS 1.32; scutellum: mesoscutum 0.32. Legs: tarsal claws simple, no basal claw; hind tibial spurs with small, dense serrations. Metasoma: overall metasoma length 3.54 mm; metasoma longer than mesosoma (metasoma: mesosoma 1.33); T 1 width 3.1 mm, anterior face concave, with surface highly declivous; metasoma broadest at T 3; T 1 - 4 slightly convex. Male (Fig. 2): Dimensions: Body length 8.9 mm, HW 2.87 mm, ITS 2.6 mm. Colouration: similar to female, except T 5 - T 7 orange, slight brown apical border laterally on T 5. Pubescence: Pubescence on face much thicker than female, hairs cover entire head including clypeus; beard of hairs on genae longer (Fig. 2 b). Preapical hair bands incomplete. Sculpture: similar to female, except polished impunctate apical bands on T 1 - 5. Structure – head: horns absent, clypeus slightly concave, covered in dense long white hairs, mandibles tridentate. Scape 0.55 mm long, similar in structure to female with final flagellomere wedge-shaped such that it tapers apically, total length of flagellum (pedicel and flagellomeres) 2.01 mm. Head measurements: HL 1.77 mm; gena width 0.7 mm; clypeus length 0.50 mm; UID 1.58 mm; LID 1.74 mm; IAD 0.78 mm; OOD 0.68 mm; IOD 0.56 mm; AOD 0.47 mm; OAD distance 0.53 mm; malar space 0.13 mm; mandible base length 0.51 mm; mandible length 0.86 mm; UID: LID 0.91; clypeus: HL 0.28. Mesosoma: overall mesosoma length 3.50 mm; pronotal collar absent; mesoscutum length 2.04 mm; scutellum length 0.79 mm; mesoscutum length: ITS 1.34; scutellum: mesoscutum 0.39. Structure – legs: tarsal claws with basal tooth (Fig. 2 a). Hind-tibial spurs similar to female. Forelegs not modified. Structure metasoma: metasoma longer than mesosoma, less so than female (metasoma: mesosoma 1.29); broadest at second segment, overall metasoma length 3.54 mm; metasoma longer than mesosoma (metasoma: mesosoma 1.33); T 1 width 3.02 mm; T 1 - 4 slightly convex; carina of T 6 bilobed, each lobe emarginate (Fig. 2 b, d).	en	Prendergast, Kit S., Campbell, Joshua W. (2025): Megachile (Hackeriapis) lucifer (Hymenoptera, Megachilidae), a new megachilid with demon-like horns that visits the Critically Endangered Marianthus aquilonaris (Pittosporaceae). Journal of Hymenoptera Research 98: 1017-1030, DOI: 10.3897/jhr.98.166350
7F05A52C51B05933BD2E50C2F8F656C7.taxon	etymology	Etymology. The name “ lucifer ” alludes to the projections on the female clypeus, reminiscent of devil-like horns. It is proposed as a noun in apposition.	en	Prendergast, Kit S., Campbell, Joshua W. (2025): Megachile (Hackeriapis) lucifer (Hymenoptera, Megachilidae), a new megachilid with demon-like horns that visits the Critically Endangered Marianthus aquilonaris (Pittosporaceae). Journal of Hymenoptera Research 98: 1017-1030, DOI: 10.3897/jhr.98.166350
7F05A52C51B05933BD2E50C2F8F656C7.taxon	distribution	Distribution. Bremer Ranges region around Lake Johnston, Coolgardie bioregion of inland southeast Western Australia (Fig. 3).	en	Prendergast, Kit S., Campbell, Joshua W. (2025): Megachile (Hackeriapis) lucifer (Hymenoptera, Megachilidae), a new megachilid with demon-like horns that visits the Critically Endangered Marianthus aquilonaris (Pittosporaceae). Journal of Hymenoptera Research 98: 1017-1030, DOI: 10.3897/jhr.98.166350
