Observations on the Mating Behavior of a South American Species of the Genus<i>Corydalus</i>(Megaloptera:Corydalidae)

Sublett, Clayton A.

doi:10.3157/021.122.0411

Cited by 7 publications

(1 citation statement)

References 10 publications

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“…In most species of the genus Corydalus (Megaloptera: Corydalidae), males have exaggerated traits such as disproportionally elongated mandibles (Contreras‐Ramos , , , ). It has been described that such elongated mandibles function as a weapon against competitors in Corydalus cornutus (L.) (Parfin ; Simonsen et al ) and an unidentified Corydalus species from South America (Sublett ). However, there is no study on the aggressiveness of males and the function of elongated mandibles in other Corydalus species (but see Liu et al ).…”

Section: Introductionmentioning

confidence: 99%

Do social environments affect the use of exaggerated traits in the dobsonflyCorydalus bidenticulatus?

Álvarez¹,

García‐Chávez

Cebada

2017

Entomological Science

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Male–male competition is strongly affected by female presence. In insects with primitive features such as megalopterans, however, it is not known how aggressiveness is expressed in the context of female presence. Here we examined the effect of social environments on the use of secondary sexual traits in the sexual behavior of the Mexican dobsonfly Corydalus bidenticulatus (Megaloptera: Corydalidae). Males of this species have exaggerated traits such as disproportionally elongated mandibles with no dentition, which is a secondary sexual trait used in competition over female access as well as males of other Corydalus species. We investigated how male–male interactions are carried out, and the scaling relationships of sexual and non‐sexual traits. Our results show that males of C. bidenticulatus are not indiscriminately aggressive. The decision whether to fight or not is affected by their social environments: males are aggressive against other males only when the presence of a female is detected. Results also suggest that mandibles and antennae are sexually dimorphic, being exaggerated and showing positive allometry only in males. In contrast, male genitalia, a sex‐specific trait, show negative allometry.

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Section: Introductionmentioning

confidence: 99%

Do social environments affect the use of exaggerated traits in the dobsonflyCorydalus bidenticulatus?

Álvarez¹,

García‐Chávez

Cebada

2017

Entomological Science

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The expression of aggression in the dobsonfliesCorydalus magnusContreras-Ramos, 1998 andPlatyneuromus soror(Hagen, 1861) (Megaloptera: Corydalidae)

2019

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Intrasexually selected weapons

2018

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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.

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Observations on the Mating Behavior of a South American Species of the GenusCorydalus(Megaloptera:Corydalidae)

Cited by 7 publications

References 10 publications

Do social environments affect the use of exaggerated traits in the dobsonflyCorydalus bidenticulatus?

Do social environments affect the use of exaggerated traits in the dobsonflyCorydalus bidenticulatus?

The expression of aggression in the dobsonfliesCorydalus magnusContreras-Ramos, 1998 andPlatyneuromus soror(Hagen, 1861) (Megaloptera: Corydalidae)

Intrasexually selected weapons

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