Research Article |
Corresponding author: Cory S. Sheffield ( cory.sheffield@gov.sk.ca ) Academic editor: Jack Neff
© 2020 Cory S. Sheffield.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Sheffield CS (2020) A new species of Andrena (Trachandrena) from the Southwestern United States (Hymenoptera, Andrenidae). Journal of Hymenoptera Research 77: 87-103. https://doi.org/10.3897/jhr.77.53704
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A new species of Andrena Fabricius, 1775, subgenus Trachandrena Robertson, 1902 is described and illustrated, A. hadfieldi sp. nov., from Arizona, United States. The new species, presently known only from the female holotype, was collected in a Malaise trap in 1994, and remained unstudied until recently. In addition, Trachandrena is compared to similar subgenera in North America to assist in recognizing new members.
Bee, new species, Trachandrena, North America, Arizona
Andrena Fabricius, 1775 is one of the largest genera of bees, with 1,556 species (
The subgenusTrachandrena Robertson, 1902 is represented by 30 species globally (
Since
For consistency with species treatments published elsewhere, the description generally follows the format used by
Photomicrography was undertaken with a Canon EOS 5D Mark II digital camera with an MP-E 65 mm 1:2.8 1–5× macro lens. Measurements were made with an ocular micrometer on a Nikon SMZ1000 stereomicroscope.
Family Andrenidae Fabricius, 1775
Subfamily Andreninae Fabricius, 1775
Andrena Fabricius, 1775: 376. Type species: Apis helvola Linnaeus, 1758, by designation of Viereck, 1912: 613.
Anthrena Illiger, 1801: 127, unjustified emendation of Andrena Fabricius, 1775.
Anthocharessa Gistel, 1850: 82, unjustified replacement for Andrena Fabricius, 1775.
Apis helvola Linnaeus, 1758, autobasic.
Trachandrena Robertson, 1902: 187, 189.
Andrena rugosa Robertson, 1891, by original designation.
Trachandrena, particularly the females, are relatively easy to recognize among most other subgenera of Andrena in the Nearctic region based on the combination of the coarsely rugose metapostnotum (i.e., propodeal triangle) (Fig.
Dorsal surface of metasoma of female Trachandrena. A Andrena rugosa, the type species of the subgenus, with relatively wide apical impressed area of T2; B A. hippotes Robertson, with a relatively narrow apical impressed area of T2 (but still wider than basal area); C A. cleodora (Viereck); D A. hadfieldi, nov. sp. Both of the latter species have broad apical impressed areas of T2 which are impunctate.
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 (
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.
The male of A. hadfieldi is unknown.
Holotype, female (Figs
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.
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.
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.
Vestiture
. Generally white to pale yellowish (Figs
Male unknown.
United States, southern Arizona.
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.
4(2) | T2 with basal area (i.e., visible base of tergum to gradulus) less than half as long medially as apical area and often less than one-third as long (Fig. |
5 |
– | T2 with basal area (i.e., visible base of tergum to gradulus) more extensive, at least half as long medially as apical area and often longer (Fig. |
14 |
5(4) | Mesoscutum with posteromedian area impunctate, or punctures separated by two or three or more pd; face above antennal socket rugose; metasoma often red | Andrena striatifrons Cockerell |
– | Mesoscutum with posteromedian area punctate, punctures usually separated by one or two pd, if by more than two pd, then face above antennal socket punctate or rugosopunctate, not strongly rugose; metasoma black or mostly so | 6 |
6(5) | Metasomal hairs entirely black or dark brown (Fig. |
7 |
– | Metasomal hairs largely pale in color (Fig. |
7a |
7(6) | T2-T4 with apical areas impunctate, often with metallic blue reflections (Fig. |
Andrena cleodora (Viereck) |
– | T2-T4 with apical areas with fine but distinct punctures, without strong metallic blue reflections; face above antennal socket with rugae weak or absent, usually with deep punctures with interspaces shiny, or weakly shagreened | Andrena cupreotincta Cockerell (in part) |
7a(6) | T2-T4 with apical areas impunctate (Fig. |
Andrena hadfieldi sp. nov. |
– | T2-T4 with apical areas distinctly punctate (Fig. |
8 (in |
Nothing is known about the biology of this species as it is known only from the holotype female which was collected in a Malaise trap. However, like other Trachandrena in the Nearctic region, this is a vernal species that probably visits spring flowering trees and shrubs (
I am grateful to Prof. Laurence Packer, York University, Toronto, Canada for comments on an early draft of this manuscript. I also appreciate the assistance of Dr. Robert Minckley (University of Rochester, Rochester, NY), Dr. John L. Neff (Central Texas Melittological Institute, Austin, TX), and Dr. Doug Yanega (University of California, Riverside, CA) for searching their respective collections for additional specimens.