Andrena (Labergeia) nahua Neff 2024, new species
Creators: name: Neff, John L.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Andrenidae
Andrena
Andrena nahua

description: Andrena (Labergeia) nahua Neff, new species
urn:lsid:zoobank.org:act: 373B3C37-288A-4DEE-84A8-26B9EECBD156
(Figs. 1–6)
DIAGNOSIS: The male of Andrena nahua can be distinguished from other Mexican Andrena by the combination of its head being much broader than long and broader than the mesosoma, gena much broader than eye, absence of facial maculation, 1st recurrent vein nearly interstitial with 2ND transverse cubital vein, black color and weak tergal fascia.
DESCRIPTION: Male, body length = 7.9 (7.5–8.3) mm, head width = 2.5 mm (2.4–2.6), head length = 1.8 mm (1.6–1.9), inter-tegular span = 1.4 mm (1.2–1.5), mesosomal width = 1.8 mm, metasomal width = 1.8 mm, forewing length = 6.6 mm (Fig. 1).
Color: Black except as follows: mandibles with apices dark brown, tegulae dark brown, wings slightly infuscated with veins brown, legs dark brown, becoming slightly lighter distally, spurs dark brown, claws translucent yellow with apical half more reddish, terga 2–5 with depressed apical third translucent brown.
Structure: Head much broader than long (Fig. 2), head width 1.41 x head length, facial quadrangle = 1.22 (1.19–1.26), eye length = 0.66 x head length (0.63–0.69), clypeal length = 0.36 x head length, eyes slightly diverging above, maximal separation just below apex so apical portion weakly convergent. Clypeus rounded medially and slightly projecting, apical margin strongly depressed, depressed area broadest above lateral margins of labrum. Clypeus weakly shiny, surface partially dulled by fine tessellation; punctures moderate and shallow, 1.5–2 puncture widths apart, slightly denser laterally, depressed apical margin shiny and nearly impunctate. Clypeus slightly raised medially, disc smooth, shiny with strong punctures 1–3 puncture widths apart, lateral portions dulled with weak shagreening with punctation denser, lower clypeal margin slightly protuberant medially beyond lower eye margin. Parocular area with sculpture similar to disc of clypeus. Supraclypeal area slightly raised, weakly shagreened with sparse punctures, with narrow, raised median carina extending from midpoint of antennal insertion to 1/3 distance to middle ocellus, frons dulled by fine striation over sparsely punctate ground, vertex sparsely punctate and dulled by fine shagreening. Diameter median ocellus = 0.18 mm, lateral ocellar diameter = 0.14 mm. Ocello-occipital distance slightly longer than lateral ocellar diameter, ocello-ocular distance = 4 x lateral ocellar diameter. Gena very broad medially (maximal width = 1.88 x lateral eye width), produced to rounded posterior margin, narrowing above and below; surface dulled and sparsely punctate except narrow, smooth, shiny impunctate band extending along eye. Antennae long (length = 1.35 mm), reaching posterior margin of scutellum in repose; scape length (0.60 mm) less than combined length of flagellar segments 1–3 (0.70 mm). Malar space linear. Mandibles slender and elongate, length = 1.3 mm, with subapical tooth, mandibular length 0.67 x inter-mandibular span. Antennae long (1.35 mm), reaching posterior margin of scutellum in repose, scape length (0.6 mm) less than combined length flagellar segments 1–3 (0.7 mm), first flagellar segment nearly twice length of second, third flagellar segment slightly longer than second. Labral process broad and short, strongly emarginate medially, surface smooth and shiny, apical margin approximately half width of basal width, length one fourth basal width. Galea short, length = 0.21 x head length, abruptly narrowed apically, surface smooth and shiny. Glossa short, 0.22 x head length. Length stipes 0.53 x head length, surface smooth and shiny, antero-dorsal margin with strong carina, lower margin straight. Surface of prementum smooth, length = 0.63 x head length. Maxillary palps 1.43 x as long as galea, ratio of segment lengths 8:7:5:5:3:5, segment 1 stout and cylindrical, segments 2-5 narrower but expanded apically, segment 6 narrow and linear. Labial palps short, half as long as galea, ratio of segment lengths 6:4:3:3, basal segment strongly arched.
Mesosoma: Pronotum with strong humeral angle, dorsoventral ridge weakly defined, interrupted medially by weak transverse depression, surface dulled by fine shagreening. Scutum slightly dulled by weak shagreening, surface with very small punctures, 2–4 puncture widths apart, scutellum with surface smooth, shiny, with few small widely separated punctures, metanotum very narrow, dull and impunctate; metapostnotum weakly delimited, surface irregularly roughened anteriorly and dulled by tessellation posteriorly, dorsal and posterior faces weakly distinguished. Mesepisterna slightly dulled by fine shagreening, appearing impunctate. Legs with surfaces smooth and shiny, without obvious modifications, basitibial plates small, shiny, impunctate, reniform, with raised margins; tibial spurs normal; claws all with long inner teeth. Tegulae unmodified, surface smooth and shiny. Wings with stigma large, three submarginal cells, first longer than third and much longer than second, ratio cell lengths on posterior margin 40:11:35; 1st recurrent vein nearly interstitial with 2ND transverse cubital vein, 2ND recurrent meeting posterior margin of third submarginal nearly at end of third submarginal. Metasoma: Surface of tergum 1 shiny with fine, very sparse punctures; discs of terga 2–6 with fine punctures 1–3 puncture widths apart, slightly dulled by fine tesselation, apical areas not depressed; pygidial plate absent. Sterna with surfaces shiny but weakly shagreened, with sparse, shallow punctures 2–4 puncture widths apart; sternum 6 with broad, shallow, apical, median emargination, lateral apices slightly reflexed; sternum 7 with distal medial process reduced to short, emarginate process with lateral fringes of short setae (Fig. 3); sternum 8 with distal process narrow, expanded apically with rounded apex, sides with rows of simple setae (Fig. 4). Gonocoxites with broad, elongate, apically rounded dorsal processes, distal processes of gonocoxites triangular in lateral view and flattened and expanded above Fig. 5), penis valves narrowly rounded at tips, expanded basally (Fig. 6).
Vestiture: Head with long, sparse, erect, white hair on gena and hypostomal area with face appearing bare, scape with sparse long erect brown hair and vertex with short, erect black hair. Hair of mesosoma mainly sparse, pale and erect except mix of sparse pale and dark hair on scutum and scutellum and mainly short erect dark hair on upper anterior surface of mesepisternum; legs with sparse, erect pale hair except that of fore-tibia and -femur appearing darker. Hair of metasomal terga and sterna with complete but very weak, pale apical fascia, discs of terga 2–5 with short, erect dark hair.
♀: Unknown
HOLOTYPE: ♂, MEXICO: Mexico City; 16 mi. S., 8550 ft, August 28, 1963, Scullen & Bollinger coll., with additional labels: INHS Insect Collection #78879, Andrena (Celetandrena) vinnula LaBerge and Hurd, det W. E. LaBerge 2003, a small handwritten label with the number 30, and a larger UCE yellow label. The terminalia were pulled and mounted on paper attached to the pin. This is the specimen used for DNA extraction by Pisanty and colleagues and is the only specimen with its mouthparts extended. The locality label does not say Mexico but this is reasonably inferred.
PARATYPES 1♂, Mexico: Puebla: 8 mi. W. Huachinango, 6540', 21 Aug 1962, Univ. Kans. Mex. Exped., additional label INHS Insect Collection # 78878, deposited Illinois Natural History Survey Insect Collection.; 1♂, MEXICO: Mexico: 22 mi. N. of Atlacomulco, 8100', 18 Aug 1954, C. D. Michener and party; additional label INHS Insect Collection # 78877, deposited United States National Museum. Both specimens labeled " Andrena (Celetandrena) vinnula LaBerge and Hurd " det W. E. LaBerge 2003 and with their terminalia dissected and mounted on paper cards attached to their pins.
The specimens are in relatively poor condition, the wings (particularly the left wings) being badly wrinkled and hair and body surfaces partially obscured by matting, perhaps a byproduct of the relaxing technique used when the genitalia were removed. One paratype (IN78878) has its left hind tarsus missing and the right side of the scutum of the holotype is split open, perhaps due to damage when it was pinned, and the tip of its right mandible is broken.
DEPOSITION: The holotype and paratype 78878 will be deposited at the Illinois Natural History Survey, Champaign-Urbana, Illinois while paratype 78877 will be deposited at the United States National Museum, Washington, D. C.
ETYMOLOGY: The name nahua is proposed as a noun in apposition and honors the Nahua, the largest modern indigenous group of Mexico, speakers of Nahautl, and the ancient inhabitants of the region of central Mexico where this bee occurs.
description: Published as part of Neff, John L., 2024, Andrena nahua, a new bee species from central Mexico (Hymenoptera: Andrenidae: Andreninae), pp. 1-7 in Journal of Melittology 2024 (116) on pages 2-6, DOI: 10.17161/jom.i116.13718, http://zenodo.org/record/13146230