Le segment genital male des coléoptères et son importance phylogenique (Coleoptera)

Iablokoff-Khnzorian, S. M.

doi:10.1002/mmnd.4810270407

Cited by 3 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although most male genitalia in beetles appear symmetric at first glance (see e.g. Iablokoff‐Khnzorian, 1980), countless deviations from symmetry can be detected and have been reported in the literature. In some cases, these deviations are only slight, e.g.…”

Section: Insectsmentioning

confidence: 99%

The evolution of asymmetric genitalia in spiders and insects

2007

View full text Add to dashboard Cite

Asymmetries are a pervading phenomenon in otherwise bilaterally symmetric organisms and recent studies have highlighted their potential impact on our understanding of fundamental evolutionary processes like the evolution of development and the selection for morphological novelties caused by behavioural changes. One character system that is particularly promising in this respect is animal genitalia because (1) asymmetries in genitalia have evolved many times convergently, and (2) the taxonomic literature provides a tremendous amount of comparative data on these organs. This review is an attempt to focus attention on this promising but neglected topic by summarizing what we know about insect genital asymmetries, and by contrasting this with the situation in spiders, a group in which genital asymmetries are rare. In spiders, only four independent origins of genital asymmetry are known, two in Theridiidae (Tidarren/Echinotheridion, Asygyna) and two in Pholcidae (Metagonia, Kaliana). In insects, on the other hand, genital asymmetry is a widespread and common phenomenon. In some insect orders or superorders, genital asymmetry is in the groundplan (e.g. Dictyoptera, Embiidina, Phasmatodea), in others it has evolved multiple times convergently (e.g. Coleoptera, Diptera, Heteroptera, Lepidoptera). Surprisingly, the huge but widely scattered information has not been reviewed for over 70 years. We combine data from studies on taxonomy, mating behaviour, genital mechanics, and phylogeny, to explain why genital asymmetry is so common in insects but so rare in spiders. We identify further fundamental differences between spider and insect genital asymmetries: (1) in most spiders, the direction of asymmetry is random, in most insects it is fixed; (2) in most spiders, asymmetry evolved first (or only) in the female while in insects genital asymmetry is overwhelmingly limited to the male. We thus propose that sexual selection has played a crucial role in the evolution of insect genital asymmetry, via a route that is accessible to insects but not to spiders. The centerpiece in this insect route to asymmetry is changes in mating position. Available evidence strongly suggests that the plesiomorphic neopteran mating position is a female-above position. Changes to male-dominated positions have occurred frequently, and some of the resulting positions require abdominal twisting, flexing, and asymmetric contact between male and female genitalia. Insects with their median unpaired sperm transfer organ may adopt a one-sided asymmetric position and still transfer the whole amount of sperm. Spiders with their paired sperm transfer organs can only mate in symmetrical or alternating two-sided positions without foregoing transfer of half of their sperm. We propose several hypotheses regarding the evolution of genital asymmetry. One explains morphological asymmetry as a mechanical compensation for evolutionary and behavioural changes of mating position. The morphological asymmetry per se is not advantageous, but rather the newly adopted mating po...

show abstract

Section: Insectsmentioning

confidence: 99%

The evolution of asymmetric genitalia in spiders and insects

2007

View full text Add to dashboard Cite

show abstract

“…(Lymexylidae) (Sharp & Muir, 1912). Penis (=mesal lobe sensu Neboiss, 1984): (0) nearly reaches up to the tips of the parameres; (1) reaches up to the base of the apical hooks; (2) does not reach up to the base of the apical hooks.Most Coleoptera have quite a long penis that nearly reaches up to the tips of the parameres (Sharp & Muir, 1912; Jeannel, 1955; Iablokoff‐Khnzorian, 1980). In some species of Archostemata the penis is so short that it only comes up to the distal third of each paramere. Penis distinctly compressed : (0) no; (1) yes.The apex of the penis is usually rounded.…”

Section: Appendix 1 List Of Characters Used In the Phylogenetic Analmentioning

confidence: 99%

“…Most Coleoptera have quite a long penis that nearly reaches up to the tips of the parameres (Sharp & Muir, 1912; Jeannel, 1955; Iablokoff‐Khnzorian, 1980). In some species of Archostemata the penis is so short that it only comes up to the distal third of each paramere.…”

Section: Appendix 1 List Of Characters Used In the Phylogenetic Analmentioning

confidence: 99%

The species‐level phylogeny of archostematan beetles—where do Micromalthus debilis and Crowsoniella relicta belong?

Hörnschemeyer¹

2009

Systematic Entomology

View full text Add to dashboard Cite

Abstract. A species‐level phylogenetic analysis comprising 37 of the 45 known extant species of archostematan beetles and a total of 110 morphological characters from adults and larvae is presented. For the first time, characters of the male genitalia are included in a phylogenetic analysis of Archostemata. The dataset is analysed with parsimony as well as with Bayesian algorithms. Analyses with differently arranged datasets, with larval characters included or excluded, and including or excluding Micromalthus debilis and Crowsoniella relicta are conducted. The resulting hypothesis of the species‐level phylogeny of Archostemata confirms Cupedidae and Ommatidae as monophyletic taxa. Within Cupedidae, the South American Paracupes and the North American Priacma together are the sister group to all remaining Cupedidae. Among the latter, the identification of a clade comprising Rhipsideigma, Cupes capitatus and Tenomerga leucophaea renders Tenomerga polyphyletic. Ascioplaga scalenacomb. nov. is transferred from Adinolepis. Characters of the male genitalia support phylogenetic affinities of Micromalthus debilis with Ommatidae and of Crowsoniella relicta with Cupedidae.

show abstract

“…Regrettably, the results of those important investigations remained almost fully ignored. Only Ponomarenko (1969) repeated the striking peculiarities which Edwards had observed in the male genitalia of Priacma serrata while Iablokoff-Khnzorian (1980), noting the Priacma-type aedeagus, questioned Edwards' interpretations of its structures. Lawrence (1999) wrote that "the aedeagus of all modern Archostemata (including Micromalthidae and Crowsoniellidae) is of a distinctive type described by Sharp & Muir (1912) as having peculiarities which are "indications of an old relationship with Insects of another Order (perhaps something that preceded the existing Sialidae)".…”

Section: Position Of the Genus Priacma Leconte 1874mentioning

confidence: 99%

Taxonomy of the reticulate beetles of the subfamily Cupedinae (Coleoptera, Archostemata), with a review of the historical development

Kirejtshuk

Nel

Kirejtshuk³

2016

Invertzool

View full text Add to dashboard Cite

The paper is mainly devoted to the studies of the fossil Cupedidae from the Paleocene of Menat (Puy-de-Dôme, France) and to a preliminary generic analysis of the subfamily Cupedinae. All modern and fossil taxa of genus rank which could belong to Cupedinae are revised. The previous division of this subfamily into tribes (including Priacmini and Mesocupidini) is regarded as not advisable. An annotated list of the fossil species of the subfamily Cupedinae is compiled and revised. New keys to subfamilies of Cupedidae and to genera and subgenera of Cupedinae, and also keys for species of Cainomerga subgen.n. and Cupes found in deposits from Menat are given. As a result, several new genera and subgenera are proposed, i.e. the fossil Apriacma gen.n., from the early Cretaceous (the type species: Priacma tuberculosa Tan, Ren et Shin, 2006), Cretomerga gen.n., from the early Cretaceous (the type species: Priacmopsis subtilis Tan et Ren, 2006), Cupopsis gen.n. from the late Cretaceous (the type species: Paracupes svetkoi Lubkin, 2003), Cainomerga subgen.n., from the Paleocene (the type species: Mesocupes (Cainomerga) brevicornis sp.n.), Menatops gen.n., from the Paleocene (the type species: Cupes orbiculatus Kirejtshuk, Nel et Collomb, 2010), Taxopsis gen.n., from the late Eocene (the type species: Cupes motschulskyi Kirejtshuk, 2005), Cainocups gen.n., from the latest Oligocene (the type species: Cainocups aixensis sp.n.), as well as the Recent Paracupoides subgen.n., from central Ecuador, South America (the type species: Paracupes ascius Neboiss, 1989). The following species are described from the Paleocene deposits of Menat: Mesocupes (Cainomerga) brevicornis sp.n., M. (C.) fraternus sp.n., M. (C.) palaeocenicus sp.n., M. (C.) ponti sp.n., Menatops bartenevi sp.n., Cupes distinctissimus sp.n., C. simillimus sp.n., or commented: Menatops orbiculatus (Kirejtshuk, Nel et Collomb, 2010), comb.n. transferred from Cupes], and Mesocupes (Cainomerga) immaculatus (Piton, 1940), comb.n. transferred from Zonabris (Meloidae). Besides, some cupedine fossils from Menat remain without both description and generic attribution. Kirghizocupes Ponomarenko, 1966 is transferred from the Triadocupedinae to Cupedinae and synonymized with

show abstract

Le segment genital male des coléoptères et son importance phylogenique (Coleoptera)

Cited by 3 publications

References 10 publications

The evolution of asymmetric genitalia in spiders and insects

The evolution of asymmetric genitalia in spiders and insects

The species‐level phylogeny of archostematan beetles—where do Micromalthus debilis and Crowsoniella relicta belong?

Taxonomy of the reticulate beetles of the subfamily Cupedinae (Coleoptera, Archostemata), with a review of the historical development

Contact Info

Product

Resources

About