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Anthidium emarginatum (Say, 1824)
Megachile emarginata Say, 1824; Anthidium montivagum Cresson, 1878; Anthidium astragali Swenk, 1914; Anthidium rhodophorum Cockerell, 1925

Life   Insecta   Hymenoptera   Apoidea   Megachilidae   Anthidium
Subgenus: Anthidium

Anthidium emarginatum FEM mm
© Copyright Laurence Packer 2014 · 7
Anthidium emarginatum FEM mm

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Anthidium emarginatum, female, midtibia6, mtg
© Kimberly Huntzinger, 2007 · 1
Anthidium emarginatum, female, midtibia6, mtg
Anthidium emarginatum, male, T7, VG
© Kimberly Huntzinger, 2007 · 1
Anthidium emarginatum, male, T7, VG

Anthidium emarginatum, male, S6, VG
© Kimberly Huntzinger, 2007 · 1
Anthidium emarginatum, male, S6, VG
Anthidium emarginatum, male, S7, VG
© Kimberly Huntzinger, 2007 · 1
Anthidium emarginatum, male, S7, VG

Anthidium emarginatum, male, S8, VG
© Kimberly Huntzinger, 2007 · 1
Anthidium emarginatum, male, S8, VG
Anthidium emarginatum, female, T6, VG
© Kimberly Huntzinger, 2007 · 1
Anthidium emarginatum, female, T6, VG
Identification
Extracted from: Grigarick A.A., & Stange L.A., (1968). The Pollen Collecting Bees of the Anthidiini of California (Hymenoptera: Megachilidae) Bulletin of the California Insect Survey Volume 9.

A. emarginatum is one of the most difficult species to distinguish in California since it presents a considerable amount of variation. The setal brush of the males varies in color from nearly all black to reddish-black. However, the presence of a well-developed lateral and median lobe on sternum VI (fig. 35) together with the lateral lobe of tergum VII (fig. 34 mean width subequal to distance from center spine) will serve to separate the males from all other species except dammersi and mormonum. The median lobe of sternum VI is much narrower than in mormonum and not parallel-sided as in dammersi. In addition, the setal brush of emarginatum is always darker than in mormonum.

The females of emarginafum, tenuiflorae, and dam_ mersi also pose problems in recognition. The convex c1ypeus of emarginatum (fig. 95) separates it from the rather flat c1ypeus of tenuiflorae (fig. 96), and the convex tergum VI of emarginatum differs from the relatively straight one of dammersi. The key utilizes color, and emarginatum is conspicuously vari- able in this regard. To overcome the difficulty, emarginatum is keyed out twice. This is necessary since emarginatum in southern California has much larger pale maculations including a nearly all yellow c1ypeus as opposed to the dark c1ypeus in northern California. In addition, the southern California popu- lations are bright yellow in contrast to the paler northern California popUlations. The color p:uterns of the two extremes are conspicuously different when compared; however, since sufficient intcrgradntion in intermediate localities (lnyo Co.) exists, division into subspecies does not appear to be wnrr.1ntcd. This increase of maculation in southern California is found in several other species, such as in tctlUl- florae and atripes, although not as extreme.

A. emarginatum is a fairly common species as indicated by widespread records of 148 males and 156 females. The species prefers montane environments and is found in nearly all the major mountain ranges of California except the north-central part of the Coast Range.


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Chaenactis douglasii @ RMBL_ENT (2)

Erigeron f @ UCRC_ENT (1)
Boraginaceae  Cryptantha intermedia @ UCRC_ENT (1)

Eriodictyon crassifolium @ UCRC_ENT (2)

Phacelia californica @ UCRC_ENT (2)

Phacelia heterophylla @ UCRC_ENT (58)

Phacelia ramosissima @ UCRC_ENT (24)

Phacelia @ UCRC_ENT (5)
Fabaceae  Lotus wrightii @ UCRC_ENT (2)

Psoralea tenuiflora @ BBSL__BBSLID (1)
Polemoniaceae  Gilia calcarea @ BBSL__BBSLID (1)

Gilia @ UCRC_ENT (1)
Polygonaceae  Eriogonum umbellatum @ UCRC_ENT (3)

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Updated: 2019-10-16 21:49:19 gmt
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