&lt;i&gt;Megachile&lt;/i&gt; (&lt;i&gt;Megachile&lt;/i&gt;) &lt;i&gt;montivaga&lt;/i&gt; (Hymenoptera: Megachilidae) nesting in live thistle (Asteraceae: Cirsium)

Orr, Michael C.; Portman, Zachary M.; Griswold, Terry

doi:10.17161/jom.v0i48.4847

Cited by 11 publications

(7 citation statements)

References 9 publications

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“…The absence of interdental laminae in some species of Megachile s.l. (e.g., Chrysosarus) that also cut leaves or even petals [e.g., M. (Megachile) montivaga Cresson] (e.g., Zillikens & Steiner, 2004;Torretta et al, 2014;Orr et al, 2015) clearly indicates that these are not the only mandibular structures involved in leaf cutting. For example, the upper and lower margins of each tooth are sometimes thin and sharp, and they might function as razors even when the interdental laminae are present.…”

Section: Morphological Phylogeny Of Megachilinimentioning

confidence: 99%

“…While retaining the use of leaves, these groups have incorporated other nesting materials, such as mud or petals (e.g., Laroca et al, 1992;Banaszak & Romasenko, 1998;Zillikens & Steiner, 2004;Michener, 2007). At least one species, M. (M.) montivaga, makes nests entirely of petals (e.g., Mitchell, 1935b;Michener, 2007;Orr et al, 2015). The environmental factors that favor the use of mud or petals in LC bees are unknown.…”

Section: Origin and Patterns Of Variation Of The Interdental Laminamentioning

confidence: 99%

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Morphological phylogeny of Megachilini and the evolution of leaf-cutter behavior in bees (Hymenoptera: Megachilidae)

2019

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A unique feature among bees is the ability of some species of Megachile Latreille s.l. to cut and process fresh leaves for nest construction. The presence of a razor between the female mandibular teeth (interdental laminae) to facilitate leaf-cutting (LC) is a morphological novelty that might have triggered a subsequent diversification in this group. However, we have a limited understanding of the phylogeny of this group despite the large number of described species and the origins and patterns of variations of this mandibular structure are unknown. Herein, using a cladistic analysis of adult external morphological characters, we explored the relationships of all genera of Megachilini and the more than 50 subgenera of Megachile s.l. We coded 272 characters for 8 outgroups and 114 ingroup species. Depending on the weighting scheme (equal or implied weighting), our parsimony analyses suggested the monophyly of Megachile s.l. and that either Noteriades Cockerell or the clade Coelioxys Latreille + Radoszkowskiana Popov is the extant sister group of all other Megachilini. In addition, we conducted Bayesian total-evidence tip-dating analyses to examine other possible hypotheses of relationships and patterns of variation of the interdental lamina. Our analyses suggest that interdental laminae developed asynchronicaly from two different structures in the mandible, and differ in their phenotypic plasticity. Character correlation tests using phylogenetic pairwise comparisons indicated that the presence of interdental lamina is not associated with head size, mandible size and shape, and pubescence on the adductor interspace. We discuss the implications of our findings for the classification of Megachilini and the development of novel evolutionary, ecological, and functional hypotheses on this behavior. New taxa established are Pseudoheriadini Gonzalez & Engel, new tribe, Ochreriadini Gonzalez & Engel, new tribe, Cremnomegachile Gonzalez & Engel, new genus, Rozenapis Gonzalez & Engel, new genus, and Saucrochile Gonzalez & Engel, new genus, along with the following new combinations: Cremnomegachile dolichosoma (Benoist), new combination, Rozenapis ignita (Smith), new combination, and Saucrochile heriadiformis (Smith), new combination.

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Section: Morphological Phylogeny Of Megachilinimentioning

confidence: 99%

Section: Origin and Patterns Of Variation Of The Interdental Laminamentioning

confidence: 99%

Morphological phylogeny of Megachilini and the evolution of leaf-cutter behavior in bees (Hymenoptera: Megachilidae)

2019

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“…While retaining the use of leaves, these groups have incorporated other nesting materials, such as mud or petals (e.g., Laroca et al, 1992;Banaszak and Romasenko, 1998;Zillikens and Steiner, 2004;Michener, 2007). At least one species, M. (M.) montivaga Cresson, makes nests entirely of petals (e.g., Mitchell 1935b;Michener, 2007;Orr et al, 2015). The environmental factors that favor the use of mud or petals in LC bees are unknown.…”

Section: Origins Of Lc Behavior and Interdental Laminaementioning

confidence: 99%

Evolution of leaf-cutter behavior in bees (Hymenoptera: Megachilidae) as inferred from total-evidence tip-dating analyses

Betancourt

Gustafson

Engel

2019

Preprint

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A unique feature among bees is the ability of some species of Megachile s.l. to cut and process fresh leaves for nest construction. The presence of razors between the female mandibular teeth (interdental laminae) to facilitate leaf-cutting (LC) is a morphological novelty that might have triggered a subsequent diversification in this group. However, we have a limited understanding of the evolutionary origins of this behavior and associated structures. Herein, we use total-evidence tip-dating analyses to infer the origin of LC bees and patterns of variation of interdental laminae. Our datasets included five nuclear genes, representatives of all fossil taxa, 80% of the extant generic-level diversity of Megachilidae, and the full range of generic and subgeneric diversity of Megachilini. Our analyses support the notion of a recent origin of LC bees (15-25 Ma), casting doubts on Eocene trace fossils attributed to these bees. We demonstrate that interdental laminae developed asynchronicaly from two different structures in the mandible (teeth or fimbrial ridge), and differ in their phenotypic plasticity. Based on the phylogenetic results, we propose robust classificatory solutions to long-standing challenges in the systematics of Megachilidae. We discuss the implications of our findings as a foundational framework to develop novel evolutionary, ecological, and functional hypotheses on this behavior.

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“…All species are leafcutters and build brood cells made of leaf fragments (e.g. Malysheva 1958, Westrich 1989, Ruhnke 2000; no Palearctic species appears to use petals as documented in the Nearctic Megachile montivaga (Michener, 2007, and references therein;Orr et al 2015). The nests are mostly located in existing, aboveground cavities; some species such as M. centuncularis are flexible and nest both in above-ground cavities and in the soil (Westrich 1989, and references therein).…”

Section: Subgenus Megachilementioning

confidence: 99%

Subgeneric classification and biology of the leafcutter and dauber bees (genus Megachile Latreille) of the western Palearctic (Hymenoptera, Apoidea, Megachilidae)

Praz¹

2017

JHR

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A new identification key is presented for the western Palearctic subgenera of the bee genus Megachile. In addition, the species composition of each subgenus is discussed, and for large subgenera, species groups are delineated to facilitate future taxonomic treatment. villipes Morawitz. In addition, the following taxonomic changes are proposed: the subgenus Paracella is synonymized with the subgenus Anodonteutricharaea (syn. n.); three species, Megachile breviceps Friese, M. luteipennis and M. algira Radoszkowski are excluded from the Palearctic fauna as they were likely based on mislabeled specimens; M. luteipennis is newly placed in synonymy with M. dimidiata Smith (syn. n.), and M. algira with M. opposita Smith (syn. n.); M. punctatissima Spinola is considered an incorrect spelling of Stelis punctulatissima (Kirby) and not a valid species-group name. Heriades sinuata Spinola is newly placed in synonymy with H. truncorum (Linnaeus) (syn. n); M. boops Friese is transferred to the genus Hoplitis (comb. n.) and placed in synonymy with Hoplitis tigrina (Morawitz) (syn. n.); M. pyrsa Vachal is transferred to the genus Prodioxys (comb. n.) and placed in synonymy with Prodioxys carnea (Gribodo) (syn. n.); Stelis megachiloides Alfken is transferred to the genus Megachile (comb. n.) and placed RESEARCH ARTICLEChristophe J. Praz / Journal of Hymenoptera Research 55: 1-54 (2017)

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<i>Megachile</i> (<i>Megachile</i>) <i>montivaga</i> (Hymenoptera: Megachilidae) nesting in live thistle (Asteraceae: Cirsium)

Cited by 11 publications

References 9 publications

Morphological phylogeny of Megachilini and the evolution of leaf-cutter behavior in bees (Hymenoptera: Megachilidae)

Morphological phylogeny of Megachilini and the evolution of leaf-cutter behavior in bees (Hymenoptera: Megachilidae)

Evolution of leaf-cutter behavior in bees (Hymenoptera: Megachilidae) as inferred from total-evidence tip-dating analyses

Subgeneric classification and biology of the leafcutter and dauber bees (genus Megachile Latreille) of the western Palearctic (Hymenoptera, Apoidea, Megachilidae)

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