&lt;strong&gt;Chrysomelid males with enlarged mandibles: three new species and a review of occurrence in the family (Coleoptera: Chrysomelidae)&lt;/strong&gt;

Reid, Chris A. M.; Beatson, M.

doi:10.11646/zootaxa.3619.1.6

Cited by 6 publications

(2 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This could explain why mandibles of N. upiformis are scoop-shaped. Besides, in chrysomelid beetles, it has been suggested that enlarged mandibles might be used by males as clasping organs during copulation [16]. It could also be the case for the curved mandibles of male N. upiformis but direct observation of their mating behaviour is needed to confirm such hypothesis.…”

Section: Resultsmentioning

confidence: 99%

Sexual Dimorphism in the Mandible Shape of <i>Neospondylis upiformis</i> (Coleoptera: Cerambycidae)

Hébert¹,

Dubuc²

2018

View full text Add to dashboard Cite

Sexes of adult Cerambycidae (Coleoptera) are usually discriminated by the greater length of male antennae. However, in Spondylidinae, adult antennae are short and the difference between sexes is negligible and difficult to appraise. Only two species belong to this subfamily in North America, one of these being Neospondylis upiformis (Mannerheim), a species rarely caught in eastern North America. Unexpectedly, we collected numerous specimens of Neospondylis upiformis on Anticosti Island, Quebec, which appears as a hotspot for this species in eastern Canada. We show that sexual dimorphism in the mandible shape of N. upiformis (Mannerheim) can be used to discriminate sexes. Females have robust mandibles with a sharp cutting inner edge while males have thin mandibles and a well-rounded inner edge. There was no overlap between sexes in all measures done on mandibles, showing that mandible shape was a reliable criterion for sexing N. upiformis. We also tested previously reported criteria using antennae, as well as other characteristics such as body size, and show that they can hardly discriminate between sexes in N. upiformis. We also present illustrations of male and female genitalia, which is rarely available for Cerambycidae.

show abstract

Section: Resultsmentioning

confidence: 99%

Sexual Dimorphism in the Mandible Shape of <i>Neospondylis upiformis</i> (Coleoptera: Cerambycidae)

Hébert¹,

Dubuc²

2018

View full text Add to dashboard Cite

show abstract

“…Spilopyrinae es una subfamilia pequeña, con distribución de tipo gondwánica, que sólo incluye nueve géneros con especies repartidas en Argentina, Australia, Chile, Nueva Caledonia y Nueva Guinea; a nivel mundial se reconocen 40 especies (Elgueta et al 2014, Jolivet et al 2014b, Reid 1992y 2000, Reid y Beatson 2010a-b, 2011y 2013, Verma y Jolivet 2002. Eumolpinae en cambio, con más de 500 géneros y cerca de 7.000 especies, es una subfamilia con representantes en prácticamente todas las regiones del mundo (ausente sólo en unas pocas áreas continentales e insulares), estando especialmente diversificada en las zonas tropicales (Jolivet y Verma 2008, Jolivet et al 2014a, Verma y Jolivet 2004.…”

Section: Introductionunclassified

Lista de las especies de Spilopyrinae y Eumolpinae (Coleoptera: Chrysomelidae) de Chile

Elgueta¹,

Daccordi

Zoia³

2017

Boletín MNHN

View full text Add to dashboard Cite

show abstract

Intrasexually selected weapons

2018

View full text Add to dashboard Cite

We propose a practical concept that distinguishes the particular kind of weaponry that has evolved to be used in combat between individuals of the same species and sex, which we term intrasexually selected weapons (ISWs). We present a treatise of ISWs in nature, aiming to understand their distinction and evolution from other secondary sex traits, including from 'sexually selected weapons', and from sexually dimorphic and monomorphic weaponry. We focus on the subset of secondary sex traits that are the result of same-sex combat, defined here as ISWs, provide not previously reported evolutionary patterns, and offer hypotheses to answer questions such as: why have only some species evolved weapons to fight for the opposite sex or breeding resources? We examined traits that seem to have evolved as ISWs in the entire animal phylogeny, restricting the classification of ISW to traits that are only present or enlarged in adults of one of the sexes, and are used as weapons during intrasexual fights. Because of the absence of behavioural data and, in many cases, lack of sexually discriminated series from juveniles to adults, we exclude the fossil record from this review. We merge morphological, ontogenetic, and behavioural information, and for the first time thoroughly review the tree of life to identify separate evolution of ISWs. We found that ISWs are only found in bilateral animals, appearing independently in nematodes, various groups of arthropods, and vertebrates. Our review sets a reference point to explore other taxa that we identify with potential ISWs for which behavioural or morphological studies are warranted. We establish that most ISWs come in pairs, are located in or near the head, are endo- or exoskeletal modifications, are overdeveloped structures compared with those found in females, are modified feeding structures and/or locomotor appendages, are most common in terrestrial taxa, are frequently used to guard females, territories, or both, and are also used in signalling displays to deter rivals and/or attract females. We also found that most taxa lack ISWs, that females of only a few species possess better-developed weapons than males, that the cases of independent evolution of ISWs are not evenly distributed across the phylogeny, and that animals possessing the most developed ISWs have non-hunting habits (e.g. herbivores) or are faunivores that prey on very small prey relative to their body size (e.g. insectivores). Bringing together perspectives from studies on a variety of taxa, we conceptualize that there are five ways in which a sexually dimorphic trait, apart from the primary sex traits, can be fixed: sexual selection, fecundity selection, parental role division, differential niche occupation between the sexes, and interference competition. We discuss these trends and the factors involved in the evolution of intrasexually selected weaponry in nature.

show abstract

<strong>Chrysomelid males with enlarged mandibles: three new species and a review of occurrence in the family (Coleoptera: Chrysomelidae)</strong>

Cited by 6 publications

References 50 publications

Sexual Dimorphism in the Mandible Shape of <i>Neospondylis upiformis</i> (Coleoptera: Cerambycidae)

Sexual Dimorphism in the Mandible Shape of <i>Neospondylis upiformis</i> (Coleoptera: Cerambycidae)

Lista de las especies de Spilopyrinae y Eumolpinae (Coleoptera: Chrysomelidae) de Chile

Intrasexually selected weapons

Contact Info

Product

Resources

About

<strong>Chrysomelid males with enlarged mandibles: three new species and a review of occurrence in the family (Coleoptera: Chrysomelidae)</strong>

Cited by 6 publications

References 50 publications

Sexual Dimorphism in the Mandible Shape of &lt;i&gt;Neospondylis upiformis&lt;/i&gt; (Coleoptera: Cerambycidae)

Sexual Dimorphism in the Mandible Shape of &lt;i&gt;Neospondylis upiformis&lt;/i&gt; (Coleoptera: Cerambycidae)

Lista de las especies de Spilopyrinae y Eumolpinae (Coleoptera: Chrysomelidae) de Chile

Intrasexually selected weapons

Contact Info

Product

Resources

About

Sexual Dimorphism in the Mandible Shape of <i>Neospondylis upiformis</i> (Coleoptera: Cerambycidae)

Sexual Dimorphism in the Mandible Shape of <i>Neospondylis upiformis</i> (Coleoptera: Cerambycidae)