Spinoliella polita Gonzalez and Engel, 2017

Gonzalez, Victor H., Smith-Pardo, Allan H. & Engel, Michael S., 2017, Phylogenetic Relationships Of A New Genus Of Calliopsine Bees From Peru, With A Review Of Spinoliella Ashmead (Hymenoptera: Andrenidae), Bulletin of the American Museum of Natural History 2017 (412), pp. 1-72 : 52-54

Spinoliella polita Gonzalez and Engel ,

new species

Figure 16

DIAGNOSIS: This Chilean species, known only from the female, is most similar to S. rufiventris and S. ruzi in body size, the bifid pygidial plate (fig. 16F), and the orange metasoma that contrasts with the dark brown to black head and mesosoma (fig. 16B, C). It can be easily separated from these species by the sculpturing of mesoscutum and mesoscutellum, which is faintly imbricate to smooth and shiny among setiferous punctures (fig. 16D). In S. rufiventris and S. ruzi both mesoscutum and mesoscutellum are dull, with contiguous, minute punctures or alveoli among larger, coarser setiferous punctures (e.g., fig. 20B).

DESCRIPTION: Female. Total body length 7.1 mm; forewing length 4.4 mm; head width 2.2 mm. Head 1.2× wider than long; inner orbits of compound eyes parallel or nearly so (fig. 16A); intertorular distance 2.6× OD, about 1.3× greater than torulorbital distance; torulus diameter about equal to OD; ocellocular distance 2.3× OD, subequal to ocelloccipital distance; interocellar distance 2.5× OD, slightly longer (1.1) than ocellocular distance; compound eye about 2× as long as wide; clypeus 2.7× broader than long, with apex surpassing inferior tangent of compound eyes by about one-half its length, projected about 0.4× compound eye width in lateral view; gena 0.9× width of compound eye in profile, widest medially; inner subantennal sulcus about onehalf length of outer subantennal sulcus; facial fovea about 7.0× longer than broad, weakly impressed, not forming a deep goove, about the same width (0.6× width of scape) across its length, 1.4× longer than scape; scape 3.1× longer than broad; pedicel about as long as F1, about as long as broad; F1 1.2× longer than broad, 1.5× longer than F2 and F3 individually; remaining flagellomeres broader than long, except last flagellomere longer than broad. Protibial spur with apical portion of rachis about two-thirds length of malus, with distinct row of seven elongate branches (not including apical portion of rachis); mesotibial spur straight, 0.6× mesobasitarsus length; mesobasitarsus robust, about 2.8× longer than broad; metabasitibial plate slightly concave on disc, delimited by strong border (fig. 16E); metatibia 4.0× longer than broad; metatibial spurs straight, inner spur about 1.5× longer than the outer spur; metabasitarsus 7.1× longer than broad, about 0.6× length of metatibia. Pygidial plate with lateral margins converging toward apex at 40° angle, apex bifid.

Head and mesosoma dark reddish brown except black on face, mesoscutum, mesoscutellum, and most of propodeum (fig. 16B, C). Cream maculation as follows (fig. 16A, B): mandible except on apical half; labrum except on apical third; clypeus except basally on disc; supraclypeal area; lower paraocular area including paraclypeal swelling; subantennal area; humeral sclerite; mesoscutellum with thin band on distal margin; bases of tibiae; T1–T4 each with lateral spot (fig. 16B, C). Metasoma orange except dark brown on lateral fovea of T2 (fig. 16B, C). Tegula translucent yellow; wing membranes subhyaline, slightly yellowish, with weak green and copper highlights, veins (R darkest), prestigma, and pterostigma light brown.

Body pubescence whitish except off-white on vertex and tarsi of all legs. Head and mesosoma with minutely branched setae denser on frons and mesoscutum; ventral margin of mandible, labrum, mesepisternum ventrally, tarsi of all legs, and outer surface of metatibia with simple, stiff setae; setae longer (at least 2× OD) on ventral margin of mandible, hypostomal area, protro- chanter, profemur, posterior margin of metabasitarsus, T5 and T6. Metasomal terga and sterna with minute, appressed, sparse setae, becoming longer toward apical terga and sterna.

Outer surface of mandible distally and basal area of labrum smooth and shiny, impunctate; clypeus smooth and shiny, with faint punctures separated by a puncture width or more, punctures absent midapically, denser laterally; paraclypeal swelling and subantennal area largely impunctate; supraclypeal area smooth and shiny, laterally with scattered, small, faint punctures as on lower paraocular area; paraocular area, lateral to torulus, and lower half of frons shiny, with minute, faint punctures among coarse setiferous punctures separated by one or two times 1–2× a puncture width; remaining areas of face, including vertex, dull, minutely punctate with sparser setiferous punctures than on lower half of frons; paraocular area, lateral to facial fovea, smooth and shiny with coarse, small punctures along orbital margin; gena smooth and shiny, with small, faint punctures separated by at least two puncture widths, punctures coarser, denser on hypostomal area. Mesosoma, including legs, weakly imbricate between punctures, except discs of mesoscutum and mesoscutellum smooth and shiny and propodeal triangle alveolate. Mesoscutum with setiferous punctures separated by 1–3× a puncture width (fig. 16D); mesoscutellum largely impunctate on disc (fig. 16D), with smaller and sparser setiferous punctures than on mesoscutum. Metasomal terga and sterna weakly imbricate with minute, scattered punctures, coarser and denser on sterna and terminal terga.

HOLOTYPE: ♀, Chile: Curicó [Maule (R-VII)]: Río Teno, Cordillera Curicó, 800 m, November 25‒29, 1981, Luis E. Peña ( SEMC).

ETYMOLOGY: The epithet specific is derived from politus (Latin, “made smooth”), and in reference to the shiny, nearly smooth integument of the mesoscutum and mesoscutellum that characterizes this species.

DISTRIBUTION: This species is known only from the type locality in Maule (R-VII), Chile.

Figures

FIGURE 16. Female holotype of Spinoliella polita Gonzalez and Engel, new species. A. Facial view. B. Lateral habitus. C. Dorsal habitus. D. Detail of mesoscutum and mesoscutellum in dorsal view. E. Metabasitibial plate. F. Pygidial plate.