Andrena (Trachandrena) hadfieldi, Sheffield, 2020

Sheffield, Cory S., 2020, A new species of Andrena (Trachandrena) from the Southwestern United States (Hymenoptera, Andrenidae), Journal of Hymenoptera Research 77, pp. 87-103 : 87

publication ID

https://dx.doi.org/10.3897/jhr.77.53704

publication LSID

lsid:zoobank.org:pub:21056983-AAB7-42A5-A08B-E61139F474C2

persistent identifier

https://treatment.plazi.org/id/4D279B93-23E4-4263-940B-7D192BD43078

taxon LSID

lsid:zoobank.org:act:4D279B93-23E4-4263-940B-7D192BD43078

treatment provided by

Journal of Hymenoptera Research by Pensoft

scientific name

Andrena (Trachandrena) hadfieldi
status

sp. nov.

Andrena (Trachandrena) hadfieldi sp. nov.

Material examined.

Holotype female, USA, Arizona, Santa Cruz Co., Patagonia Sonorita Creek Reserve , 31.53N, 110.77W, 14.iv.1994, M[alaise] T[rap], B. Brown & E. Wilk / Royal Saskatchewan Museum Entomology RSKM_ENT_E-219414. The single specimen is housed at the Royal Saskatchewan Museum (RSKM) in Regina, Saskatchewan, Canada. The dataset for Andrena hadfieldi is archived with Canadansys (http://community.canadensys.net/) under resource title "A new Trachandrena from the Southwestern USA" and can be accessed using the following: https://doi.org/10.5886/em2mri. GoogleMaps

Diagnosis.

The female of Andrena hadfieldi is unique among Trachandrena in the Nearctic region in having very wide (i.e., at least 2/3 of the median tergal length) marginal zones of T2-T4 which are shiny and impunctate (Fig. 2D View Figure 2 ), a feature shared only with A. cleodora (Viereck) (Fig. 2C View Figure 2 ). Andrena hadfieldi is smaller than A. cleodora (9 mm, versus 10-13 mm body length in A. cleodora ), and differs from A. cleodora in having the terga black (Fig. 2D View Figure 2 ) instead of black with strong metallic bluish reflections (Fig. 2C View Figure 2 ), and in having entirely pale pubescence, including the scopa (Figs 6 View Figure 6 , 7 View Figure 7 ); the hair on the metasoma (Fig. 2C View Figure 2 ) and scopa of A. cleodora are black, and the pubescence of the dorsum of thorax is yellowish to red (subspecies Andrena cleodora cleodora ; widespread in western North America) or entirely black (subspecies Andrena melanodora melanodora Cockerell; known from southern California). The structure of the pubescence on the dorsum of the thorax also differs between these two species, being long, very thin, and weakly plumose in A. hadfieldi (Fig. 6 View Figure 6 ), but shorter and densely plumose, almost scale-like, in A. cleodora (Fig. 8 View Figure 8 ). The process of the labrum in A. hadfieldi is more than 3 × as wide basally as long medially (Fig. 9A View Figure 9 ); in A. cleodora the labral process is larger, subtriangular, with the base 2.5 × as wide as the medial length (Fig. 9B View Figure 9 ). The body surface sculpture of A. hadfieldi is much finer than for A. cleodora ; as examples, the face of A. hadfieldi is generally more finely and sparsely punctate, with shiny interspaces> two pd on the lower paraocular area (Fig. 10A View Figure 10 ), while in A. cleodora the lower paraocular area is more coarsely and closely punctate (interspaces <pd) (Fig. 10B View Figure 10 ); the surface of the propodeal corbicula is smooth with a few short rugae in A. hadfieldi (Fig. 11A View Figure 11 ), while coarsely rugose in A. cleodora (Fig. 11B View Figure 11 ).

The male of A. hadfieldi is unknown.

Description.

Holotype, female (Figs 6 View Figure 6 , 7 View Figure 7 , 9A View Figure 9 , 10A View Figure 10 , 11A View Figure 11 , 12 View Figure 12 ). Body length 9 mm; head length 1.9 mm; head width 2.5 mm; intertegular width 2.1 mm; fore wing length 6.9 mm.

Colour. Black except as follows: F3-F10 dark reddish-brown below; tegula moderately translucent, brown, becoming reddish brown in posterior half; wing membranes slightly infumate, veins yellowish-brown; legs dark brown, apical tarsal segments reddish brown.

Structure. Labrum with process trapezoidal, more than three times as wide at base as long medially, apical edge entire (Fig. 9A View Figure 9 ). Clypeus with coarse, close round to irregular shaped punctures, becoming finer apically, interspaces shiny and linear, less than 0.5 pd, without obvious median impunctate line but with a small shiny subapical boss extending for less than 1/5th median length of clypeus (Fig. 10A View Figure 10 ). Supraclypeal area with distinct round punctures separated by 0.5 pd, surface rather shiny (Fig. 10A View Figure 10 ). Mandible short, extending beyond middle of labrum by about ¼ its length in repose. Malar space extremely short (Fig. 10A View Figure 10 ). Lower paraocular area shiny with small punctures separated by> two pd (Fig. 10A View Figure 10 ). Face above antennal socket with rugulae extending to ocelli, without obvious punctures. Facial fovea long, extending from middle level of lateral ocellus to basal edge of clypeus; lower portion narrow, from below level of antennal socket about 1/3 as wide as upper portion, outer edge slightly incurved from inner margin of compound eye just above level of antennal socket, this area smooth, shiny and impunctate (Fig. 10A View Figure 10 ). Compound eye just over three times as long as broad in frontal view, inner margin converging slightly toward mandibles. Genal area in profile about as broad as compound eye, surface shiny with minute punctures separated by 2 pd, posterior half dull with reticulate shagreening, without apparent punctures except near base of mandible. Vertexal area above lateral ocellus subequal to one ocellar diameter, dulled by crowded punctures and dense reticulate shagreening. Antennal scape length equal to combined length of F1-F3; F1 about 1.5 times as long as broad at apex, and 1.5 times longer than F2; F2-F5 quadrate, F6-F9 about 1.2 times longer than broad, F10 more elongate, about 1.5 times longer than broad.

Pronotum somewhat shiny, with distinct punctures dorsally, separated by about two pd, laterally mostly impunctate with surface somewhat dull. Mesoscutum with large, round deep punctures, between parapsidal lines and posteromedially separated mostly by ½ to one pd, anteriorly and laterally separated by less than ½ pd, becoming somewhat rugosopunctate along anterior edge (Fig. 7 View Figure 7 ), surface dull, reticularly shagreened. Scutellum similarly punctured though punctures slightly sparser anteriorly, and surface mostly shiny. Metanotum dull and tessellate laterally, becoming somewhat shiny and punctate medially. Metapostnotum with rather shallow but distinct rugae, these somewhat irregular (Fig. 12 View Figure 12 ); dorsolateral and posterior surfaces of propodeum moderately coarsely rugosopunctate, tessellate, dull; propodeal corbicular surface moderately shiny, tessellate, with a few short rugae (Fig. 11A View Figure 11 ). Mesepisternum coarsely rugose and somewhat shiny. Metepisternum surface smooth, with a slight shine. Fore femur with base round in outline. Posterior hind tibial spur straight. Tarsal claws with a small subbasal tooth.

T1 shiny and largely impunctate, with basal area (= disc) punctures obscure, shallow, sparse, separated by ≥ 5pd; marginal zone impunctate and shiny, occupying about 3/5th of median length of tergum, a few sparse minute punctures visible at extreme lateral edge, surface smooth (Fig. 2D View Figure 2 ). T2 with marginal zone clearly longer than basal area (about 3/4th medial with); basal area shiny with punctures separated by one pd, a narrow dull impunctate area adjacent to gradulus; marginal zone smooth, shiny and impunctate (Fig. 2D View Figure 2 ). T3-T4 similar to T2 but marginal zone of T4 shorter, about 3/5th of median length of tergum (Fig. 2D View Figure 2 ). T5 with basal area broader than marginal zone, basal area tessellate, with distinct punctures separated by 2-3 pd, becoming closer adjacent to marginal zone (Fig. 2D View Figure 2 ); marginal zone dull, largely obscured by prepygidial fringe (Fig. 2D View Figure 2 ). Pygidial plate U-shaped with rounded apex about ½ as wide as base, with sharply pointed, internal, raised triangular area on median surface. S2-S5 with surface somewhat shiny, punctures uniformly dense, separated by 1 pd; S2 with a medial U-shaped depression.

Vestiture. Generally white to pale yellowish (Figs 6 View Figure 6 , 7 View Figure 7 ), somewhat reddish on mandible and apical margin of labrum. Propodeal corbicula with long plumose hairs on dorsal and posterior edges, lacking anterior hairs, with long simple hairs internally (Fig. 11A View Figure 11 ). Trochanteral flocculus complete. Tibial scopal hairs long and simple. Prepygidial fimbria and T6 with reddish brown hairs (Fig. 2D View Figure 2 ). Terga lacking apical fasciae except reduced to small lateral patches of sparse hairs on T2 and T3 (Fig. 2D View Figure 2 ); a few long pale subappressed hairs arising laterally from the premarginal line and overlaying marginal zone (Fig. 2D View Figure 2 ). T1 with sparse pale hairs laterally and on declivitous anterior surface (Fig. 2D View Figure 2 ). S2 to S5 with sparse, pale, elongate plumose hairs apically, these becoming longer laterally (i.e., ½ length of succeeding segment).

Male unknown.

Distribution.

United States, southern Arizona.

Etymology.

It is a privilege to name this new species after Canadian astronaut Col. Chris Hadfield for his many achievements as a pilot, astronaut, author, lecturer, and science educator.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Andrenidae

Genus

Andrena