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Megachile centuncularis (Linnaeus, 1758)
Apis centuncularis Linnaeus, 1758; Megachile parvula Lepeletier, 1841; Megachile infragilis Cresson, 1878; Megachile appia Nurse, 1903; Megachile leoni Titus, 1906; Perezia_homonym maura_homonym Ferton, 1914; Fertonella maura_homonym Ferton, 1914; Anthemois infragilis (Cresson, 1878); Anthemois centuncularis (Linnaeus, 1758); Megalochila centuncularis (Linnaeus, 1758); Megachile centuncularis nesiotica Mavromoustakis, 1953; Megachile (Megachile) centuncularis sachaensis Davydova and Pesenko, 2002, valid subspecies

Life   Insecta   Hymenoptera   Apoidea   Megachilidae   Megachile
Subgenus: Megachile

Megachile centuncularis, female
© Copyright Celeste Ets-Hokin 2013 · 17
Megachile centuncularis, female

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    Extracted from C. S. Sheffield 2011. Canadian Journal of Arthropod Identification No. 18 (November 2011)

    Megachile (Megachile) centuncularis (Linnaeus, 1758)

    Apis centuncularis Linnaeus, 1758. Syst. Nat., Ed. 10: 575 (♀).

    Apis rotundata Fabricius, 1787. Mant. Insect. 1: 303 (♂).

    Megachile parvula Lepeletier, 1841. Hist. Nat. Insect. Hymen. 2: 340 (♀).

    Megachile infragilis Cresson, 1878. Trans. Amer. Entomol. Soc. 7: 127 (♂).

    Megachile appia Nurse, 1903. Ann. Mag. Nat. Hist. 11: 546.

    Megachile leoni Titus, 1906. Proc. Entomol. Soc. Wash. 7: 150 (♀).

    Perezia maura Ferton, 1914. Ann. Soc. Entomol. France 83: 233 (intersex).

    Megachile centuncularis theryi Cockerell, 1931. Ann. Mag. Nat. Hist. (10) 7: 274.

    Megachile centuncularis nesiotica Mavromoustakis, 1953. Ann. Mag. Nat. Hist. (12) 6: 779.

    Diagnosis. The female of M. centuncularis can be recognized by the combination of 5-dentate mandibles with an incomplete cutting edge between 2nd and 3rd teeth, entirely pale scopa, and T6 with pubescence entirely black. They are most similar to M. lapponica and M. relativa. The female of M. lappinica has black scopal hairs on S6. The female of M. relativa has T6 with conspicuous, erect golden hairs among the black hairs. The male can be recognized by the combination of simple and dark front tarsi, front coxa without spine, 3-dentate mandibles with the teeth equally spaced, clypeus without a prominent median tubercle on apical margin, and the outer tarsal claw much more rounded than the inner claw. They are most similar to M. lapponica and M. relativa. The males of these two species have a prominent median tubercle on apical margin of clpeus, and inner and outer tarsal claws that are equally sharp.

    FEMALE: Length 10-11 mm.

    Head. 1) compound eyes slightly convergent below; lateral ocelli slightly nearer margin of vertex than eyes (5:6), 2) clypeus rather strongly convex, apical margin straight, narrowly shining and impunctate medially, 3) mandibles distinctly 5-dentate, with an incomplete cutting edge between 2nd and 3rd teeth (Plate 1, Figure M14), 4) gena subequal to compound eye in width, 5) punctures rather coarse, but shallow, becoming slightly separated (< 1 pd) on vertex laterally, somewhat closer medially, and closely crowded on frons, becoming fine, close and obscure on gena; punctures rather coarse and well separated on clypeus and supraclypeal area medially, becoming close laterally and along upper margin of clypeus, 6) pubescence quite elongate around antennae and on lower paraocular area and on clypeus, hardly obscuring surface, largely yellowish, but with some darker hairs in region of ocelli and on vertex laterally, 7) F1 longer than broad (2:1.5), longer than pedicel, slightly longer that F2, subequal in length to remaining flagellomeres, which are slightly longer than broad (2:1.7), apical flagellomere elongate (7:3).

    Mesosoma. 1) pubescence largely yellowish, quite copious laterally and posteriorly, , dorsal surface somewhat more sparsely pubescent, 2) punctures of mesoscutum coarse, close and distinct, not very deep, slightly separated only in centre of disc, scutellum and axilla with densely crowded punctures; punctures of pleura rather shallow, quite close and coarse, surface rather dull, propodeum somewhat more shining, punctures minute and rather close and obscure, triangle shiny and impunctate, 3) mid and hind basitarsi nearly as broad as their tibiae, but considerably shorter, spurs yellow, 4) tegula shining, with very fine and rather close punctures anteriorly, almost impunctate in posterior half, 5) wings subhyaline, faintly clouded apically, veins brown-black.

    Metasoma. 1) T2-T4 with complete, transverse grooves that are submedian near centre, somewhat nearer basal margin at sides, punctures fine, rather well separated medially, becoming somewhat closer laterally, those on apical portions of discs somewhat closer than those on basal side of grooves, apical margins not at all depressed medially, somewhat depressed toward sides where there are quite densely white fasciate; T5 not grooved, punctures slightly separated, rather fine and irregular, apical margins slightly depressed, with a complete white fascia; discal pubescence suberect, rather dense, entirely pale on T1 and T2, short, black and erect on T3-T5, but with yellowish hairs evident at sides as viewed from above, T6 very slightly concave in profile, with abundant, erect and rather elongate, black hairs evident, surface very finely, closely and deeply punctate across base, these becoming very fine, densely crowded and obscure toward the apex, 2) S6 largely bare and shining, with a subapical fringe of elongate hairs, and a more nearly apical fringe of shorter hairs, apex produced slightly beyond this fringe, yellowish-hyaline; scopa orange-yellow, sterna closely, quite uniformly punctate, punctures very fine on the more basal segments, becoming quite coarse and close on the more apical sterna.

    MALE: Length 8-9 mm.

    Head. 1) compound eyes subparallel to slightly converging below; lateral ocelli subequally distant from eyes and margin of vertex, 2) clypeal margin nearly straight, very slightly and narrowly produced medially, though hardly tuberculate, 3) mandibles distinctly 3-dentate, basal process triangular, subbasal in position, 4) gena subequal to compound eye in width, 5) punctures deep and distinct, slightly separated on vertex toward each side, rather finely crowded on frons; gena very finely and quite closely punctate, minutely and densely crowded over lower part of face and clypeus, 6) pubescence yellowish, quite dense and elongate around antennae and over face below, rather short but faintly yellowish and quite copious on gena below, black on vertex and on gena above, 7) F1 about as long as broad, longer than pedicel, and shorter than remaining flagellomeres, which are longer than broad (5:3), apical flagellomere slender and more elongate, twice as long as broad.

    Mesosoma. 1) pubescence largely yellowish laterally and posteriorly, dorsal surface somewhat more sparsely pubescent with intermixtures of black hairs on mesoscutum and scutellum, 2) mesoscutum closely, rather coarsely and distinctly punctate throughout, punctures densely crowded laterally and over scutellum and axilla, very close on pleura; propodeum somewhat shining, smooth, punctures minute and quite close posteriorly, triangle shiny and impunctate, somewhat rugosostriate along basal margin, 3) all basitarsi slender and simple, much shorter than their tibiae; spurs yellow, middle spur well developed, outer tarsal claws much more rounded than the inner ones, which are pointed, 4) tegula somewhat yellowish-brown, shining, minutely and rather closely punctate, 5) wings subhyaline, veins black.

    Metasoma. 1) T2 and T3 with basal transverse depressions; T1-T4, quite closely and regularly punctate, apical margins slightly depressed laterally; discal pubescence erect and pale on T1 and T2, dark in part on T3-T5, base of T5 with a rather large patch of appressed, yellowish tomentum, apical margin depressed, densely yellowish fasciate; T6 shining, with minute and very close punctures and scattered, more or less distinct, well separated nodules, the carina only slightly produced, very shallowly emarginate apically, median teeth of apical margin carinate and broad, lateral teeth very low and subacute, 2) S1-S4 exposed, yellowish-hyaline apically, S1-S3 with rather dense fringes of pale yellowish hair, discs sparsely pale pubescent; punctures close and rather fine on the more basal terga, becoming somewhat coarser but still close apically.

    Genitalia. Plate 2, Figure G14.

    Discussion. Although historically considered holarctic in distribution (which is confirmed by DNA barcoding), the lack of specimens of M. centuncularis from northwestern North America is atypical for a holarctic species (see Map 14). Recent study of an unrelated bee species with a similar range has demonstrated that the North American populations resulted from an introduction (Zayed et al. 2007), the same may be true for M. centuncularis. Further studies to confirm the status of this species in North America are warranted. Megachile centuncularis is a cavity nester, and accepts trap-nests (Table 1), has a second generation in some parts of its range in Canada (C.S. Sheffield, pers. obs. in NS).

    Distribution: Widespread in southern Canada from NS-BC (see Map 14).

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Megachile centuncularis, male PaDIL
Laurence Packer · 10
Megachile centuncularis, male PaDIL
Megachile centuncularis f
© Copyright Hadel Go 2014 · 8
Megachile centuncularis f

Megachile centuncularis
© Copyright Hadel Go 2014 · 7
Megachile centuncularis
Megachile centuncularis
© Copyright Hadel Go 2014 · 7
Megachile centuncularis

Megachile centuncularis Male
© Copyright Laurence Packer 2014 · 7
Megachile centuncularis Male
Megachile centuncularis, leaf-cutter bee
© Copyright John Ascher, 2006-2014 · 6
Megachile centuncularis, leaf-cutter bee

Megachile centuncularis, leaf-cutter bee
© Copyright John Ascher, 2006-2014 · 6
Megachile centuncularis, leaf-cutter bee
Megachile centuncularis
© Copyright John Ascher, 2006-2014 · 6
Megachile centuncularis

Megachile centuncularis
© Copyright John Ascher, 2006-2014 · 6
Megachile centuncularis
Megachile centuncularis, F, Back, NY, Elk Lake ---.
© Copyright source/photographer · 5
Megachile centuncularis, F, Back, NY, Elk Lake ---.

Megachile centuncularis, F, Face, NY, Elk Lake ---.
© Copyright source/photographer · 5
Megachile centuncularis, F, Face, NY, Elk Lake ---.
Megachile centuncularis, female, S6, light hair basally, apical third of plate is bare, dark apical fringe
Tracy Zarrillo · 4
Megachile centuncularis, female, S6, light hair basally, apical third of plate is bare, dark apical fringe

Megachile centuncularis
Sandy Spitalnik · 1
Megachile centuncularis
Megachile centuncularis, Lloyd Spitalnik
Lloyd Spitalnik · 1
Megachile centuncularis, Lloyd Spitalnik
Overview
Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152.


FEMALE—Length 10-11 mm.; entirely black, including tegulae and legs, spurs yellow; eyes very slightly convergent below; clypeus rather strongly convex, apical margin straight, narrowly shining and impunctate medially; mandibles distinctly 5-dentate; lateral ocelli slightly nearer margin of vertex than to eyes; cheeks subequal to eyes in width; punctures rather coarse, but shallow, well separated on vertex laterally, somewhat closer medially, and closely crowded below ocelli, becoming fine, close and obscure on cheeks; punctures rather coarse and well separated on clypeus and supraclypeal area medially, becoming close laterally and along upper margin of clypeus; pubescence quite copious, largely yellowish on head and thorax, but with some darker hairsin region of ocelli and on vertex laterally; pubescence long and copious around antennae and on sides of face below, on clypeus and over most of thorax laterally and posteriorly, dorsum of thorax somewhat more thinly pubescent; punctures of scutum coarse, close and distinct, not very deep, slightly separated only in center of disc, scutellum and axillae with densely crowded punctures; punctures of pleura rather shallow, quite close and coarse, surface rather dull, propodeum somewhat more shining, punctures minute and rather close and obscure; mid and hind basitarsi nearly as broad as their tibiae, but considerably shorter; tegulae shining, with very fine and rather close punctures; wings subhyaline, faintly clouded apically, veins testaceous-piceous; abdominal terga 2-4 with complete, transverse grooves which are submedian near center, somewhat nearer basal margin at extreme sides, punctures fine, rather well separated medially, becoming somewhat closer laterally, those on apical portions of discs somewhat closer than those on basal side of grooves, apical margins not at all depressed medially, somewhat depressed toward extreme sides where there are quite densely yellowish fasciate; tergum 5 not grooved, punctures slightly separated, rather fine and irregular, apical margins slightly depressed, with a complete yellowish fascia; discal pubescence suberect, rather dense, entirely yellow on terga 1 and 2, short, black and erect on 3-5, but with yellowish hairs evident at sides as viewed from above, 6 very slightly concave in profile, with abundant, erect and rather elongate, black hairs evident, surface very finely, closely and deeply punctate across base, these becoming very fine, densely crowded and obscure toward the apex; sternum 6 largely bare and shining, with a subapical fringe of elongate hairs, and a more nearly apical fringe of shorter hairs, apex produced slightly beyond this fringe, yellowish-hyaline; scopa orange-yellow, sternal plates closely, quite uniformly punctate, punctures very fine on the more basal segments, becoming quite coarse and close on the more apical sterna, no sternal fasciae evident.

MALE—Length 8-9 mm.; black including legs, tegulae somewhat more brownish-testaceous, spurs yellow; clypeal margin nearly straight, very slightly and narrowly produced medially, mandibles distinctly 3-dentate, with a triangular, basal, inferior process; apical segment of flagellum slender and elongate; lateral ocelli subequally distant from eyes and margin of vertex; cheeks about as broad as eyes; punctures deep and distinct, slightly separated on vertex toward each side, rather finely crowded on face medially and below ocelli; cheeks very finely and quite closely punctate, pubescence yellowish, quite dense and elongate around antennae and over face below, rather short but faintly yellowish and quite copious on cheeks below, minutely and densely crowded over lower part of face and clypeus; scutum closely, rather coarsely and distinctly punctate throughout, punctures densely crowded laterally and over scutellum and axillae, very close on pleura; propodeum somewhat shining, smooth, punctures minute and quite close posteriorly; all basitarsi slender and simple, much shorter than their tibiae; middle spurs well developed; tegulae shining, minutely and rather closely punctate; wings subhyaline, veins piceous; basal transverse grooves evident on terga 2 and 3, these together with 1 and 4, quite closely and regularly punctate, apical margins slightly depressed laterally, discal pubescence erect and pale on terga 1 and 2, dark in part on 3-5, base of 5 with a rather large patch of appressed, yellowish tomentum, apical margin depressed, densely yellowish fasciate; tergum 6 shining, with minute and very close punctures and scattered, more or less distinct, well separated nodules, the carina only slightly produced, very shallowly emarginate apically, median teeth of apical margin carinate and broad, lateral teeth very low and subacute; sterna 1-4 exposed, yellowish-hyaline apically, with rather dense fringes of pale yellowish hair, punctures close and rather fine on the more basal terga, becoming somewhat coarser but still close apically; setose area of sternum 5 much restricted, densely setose (fig. 41) setose areas of sternum 6 nearly meeting, apical lobe very small and narrow, barely evident; gonocoxites robust, flexed ventrally, reflexed at tip (fig. 42).
DISTRIBUTION—This is a holarctic species, its range extending from the Pacific to the Atlantic in Canada and the northern half of the United States. In the east it has been recorded from Nova Scotia to Minnesota, Iowa, Illinois and Virginia, and is in flight from May to September.

FLOWER RECORDS—Melilotus and Trifolium. Medler (1959) records it visiting Epilobium angustifolium and Solidago sp., and states that it is an effective pollinator of alfalfa (Medicago sativa). In the Revision of Megachile (Mitchell, 1935) the following additional, genera are listed: A.lthaea, Psoralea, Centaurea, Carduus, Grindelia, Helianthus, Inula, Taraxacum and Vernonia. Robertson (1929) lists a number of genera, not previously cited. However, he believed centuncularis and relativa to be synonymous, making his records uncertain.

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Apiaceae  Apium sp @ BBSL (1)
Apocynaceae  Apocynum cannabinum @ PN- (1)

Asclepias incarnata @ UCMS_ENT (1)
Asparagaceae  Asparagus officinalis @ CUIC_ENT (1)
Asteraceae  Arctium lappa @ MLSB__N16- (4)

Arctium minus @ BBSL (3)

Arctium @ CUIC_ENT (1)

Centaurea cyanus @ I_HHGA (1); AMNH_BEE (1); CUIC_ENT (1)

Centaurea jacea @ AMNH_BEE (3)

Centaurea sp @ CUIC_ENT (1)

Cichorium intybus @ MLSB__N16- (2); PN- (3)

Cirsium arvense @ MLSB__N16- (1)

Cirsium sp @ UCMS_ENT (1)

Cirsium spp @ PN- (1)

Cirsium undulatum @ AMNH_BEE (1)

Cirsium vulgare @ UCMS_ENT (6); CUIC_ENT (4); MLSB__N16- (1)

Erigeron speciosus @ BBSL (1)

Grindelia squarrosa @ AMNH_BEE (2)

Helianthus annuus @ AMNH_BEE (1)

Helianthus maximiliani @ AMNH_BEE (1)

Helianthus @ AMNH_BEE (1)

Hypochaeris radicata @ UCMS_ENT (1)

Rudbeckia @ I_JSA (1)

Silphium integrifolium @ I_AJM (1)

Solidago @ CUIC_ENT (2)

Sonchus arvensis @ CUIC_ENT (4); AMNH_BEE (1)

Sonchus spp @ PN- (2)

Symphyotrichum spp @ PN- (1)

Tanacetum vulgare @ UCMS_ENT (2)

Taraxacum officinale @ AMNH_BEE (1)

Taraxacum @ AMNH_BEE (1)

Vernonia fasciculata @ AMNH_BEE (2)
Boraginaceae  Anchusa officinalis @ BBSL (1)
Brassicaceae  Brassica rapa @ UCMS_ENT (1)
Cactaceae  Opuntia humifusa @ CUIC_ENT (1)
Caprifoliaceae  Lonicera arvensis @ CUIC_ENT (2)

Lonicera @ UCMS_ENT (1)
Caryophyllaceae  Lychnis flos-cuculi @ AMNH_BEE (1)
Convolvulaceae  Convolvulus arvensis @ MLSB__N16- (1)
Fabaceae  Lathyrus latifolius @ MLSB__N16- (1)

Lotus corniculatus @ MLSB__N16- (2); BBSL (1); CUIC_ENT (1); PN- (1)

Lupinus arboreus @ I_CEH (1)

Medicago sativa @ AMNH_BEE (4); CUIC_ENT (17)

Melilotus officinalis @ AMNH_BEE (7); CUIC_ENT (3)

Melilotus @ AMNH_BEE (1)

Phaseolus vulgaris @ UCMS_ENT (1)

Robinia hispida @ CUIC_ENT (1)

Securigera varia @ MLSB__N16- (4)
Lamiaceae  Caryopteris x @ CUIC_ENT (4)

Salvia farinacea @ CUIC_ENT (2)
Lythraceae  Lythrum salicaria @ UCMS_ENT (1)
Malvaceae  Alcea rosea @ AMNH_BEE (3)
Onagraceae  Oenothera villosa @ AMNH_BEE (2)

Oenothera @ AMNH_BEE (1)
Ranunculaceae  Ranunculus acris @ UCMS_ENT (2)

Ranunculus @ CUIC_ENT (3)
Tamaricaceae  Tamarix @ AMNH_BEE (1)
Verbenaceae  Verbena hastata @ CUIC_ENT (1); MLSB__N16- (1)
_  male @ I_JSA (1)

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Female on a Brassicaceae species. Dol pri Ljubljani, June 2009.

 

Megachile centuncularis (Linnaeus, 1758)

 

 

Holarctic species, widely distributed in Slovenia.

Polylectic species, visits mainly Asteraceae. Nests in various pre-existing cavities. Cells are made of scraps of leaves.

Partly bivoltine. Flies from June to October.

 

Female on Telekia speciosa . Lukovica pri Brezovici, Ljubljansko barje, June 1989.

Leafcutter bees like Megachile centuncularis cut plant leaves, which are used for cell walls in the nests.

 

Razširjenost vrste v Sloveniji.

Zelo razširjena vrsta.

 

 

Andrej Gogala: Bee fauna of Slovenia

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