Chromosome evolution in tiger beetles: Karyotypes and localization of 18S rDNA loci in Neotropical Megacephalini (Coleoptera, Cicindelidae)

Proença, Sónia J. R.; Collares‐Pereira, Maria João; Serrano, Artur R. M.

doi:10.1590/s1415-47572005000500012

Cited by 7 publications

(7 citation statements)

References 17 publications

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“…Polymorphisms in the number of copies is normal, both between homologues in the same individual and between individuals. In some species the rDNA can be confined to a single site on a pair of homologous chromosomes, but quiet often it is spread over several chromosomes (Sumner, 2003;Proença et al, 2005). Up to now only one NOR per haploid genome is reported in heteropterans.…”

Section: Discussionmentioning

confidence: 99%

Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae)

Bressa¹,

Franco²,

Toscani³

et al. 2008

Eur. J. Entomol.

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Abstract.Heterochromatin is one of the most dynamic components in the genome of species. Previous studies on the heterochromatin content and distribution in Heteroptera (insects with holokinetic chromosomes) have shown that the species belonging to the family Coreidae are interesting model organisms since they show very diverse C bands patterns. In the present work, we analyzed the C-band pattern in individuals of Holhymenia rubiginosa from different populations collected in different years. This species has the diploid karyotype 2n = 27/28 = 24 + 2m + X0/XX (male/female). C-bands are terminally, subterminally or interstitially located on 10-17 chromosomes and a remarkable heterochromatin heteromorphism is observed in the meiotic bivalents: in the presence/absence of bands, in the size of bands and number of bands. A heteromorphism is also inferred in the number of ribosomal genes from the difference in the fluorescent in situ hybridization signals between NOR-homologues. Chiasmata are generally located opposite to conspicuous C-bands, but in some bivalents chiasmata are also observed in close proximity to C-bands. Considering the striking variation in heterochromatin content between individuals and populations it is suggested that heterochromatin should be selectively neutral in H. rubiginosa.

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Section: Discussionmentioning

confidence: 99%

Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae)

Bressa¹,

Franco²,

Toscani³

et al. 2008

Eur. J. Entomol.

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“…Considering all the available cytogenetic data for Megacephalini (Fig. ), a tendency can be seen in the reduction of chromosome number, at least in the Australian lineage Pseudotetracha (Galián & Hudson, ; this work) and the American Tetracha (Proença, Serrano & Collares‐Pereira, ; Proença et al ., ). This pattern of karyotypic orthoselection is also found in the tribe Cicindelini (Galián et al ., , ) and in other groups of carabid beetles (Serrano & Galián, ), whereas in other ground‐beetle lineages, both increasing and decreasing trends have been observed.…”

Section: Discussionmentioning

confidence: 97%

“…In the tribe Megacephalini, a pantropical diverse group (mainly in South America, Australia and Africa) with more than 100 species occupying a basal position in the tiger beetles phylogeny (Galián et al, 2002;Zerm et al, 2007), chromosomal numbers vary from 12 to 15 pairs of autosomes plus a simple XY or X0 heterosome system (Serrano, Galián & Ortiz, 1986;Galián & Hudson, 1999;Proença, Serrano & Collares-Pereira, 2003;Proença, Collares-Pereira & Serrano, 2005). Inside this tribe, the genus Pseudotetracha makes up a monophyletic group distributed around lakes in Australia.…”

Section: Introductionmentioning

confidence: 99%

Recent origin of a chiasmatic sex trivalent in Australian Pseudotetracha tiger beetles

2012

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Meiotic behavior based on observations of the first and second divisions was studied in males of four taxa of the Australian tiger beetle genus Pseudotetracha of the tribe Megacephalini (Coleoptera). Pseudotetracha blackburni clade 1 shows 10 pairs of autosomes plus a trivalent that is hypothesized to be the result of either a translocation or a fusion in which the original heterosomes (very likely XY) and an autosomal pair are involved, giving rise to a recently established neo‐X1X2Y sex chromosome system of chiasmatic nature. The origin of this karyotype has been determined to have taken place 2.30–3.72 million years in the past using a molecular clock based on the 16S rRNA substitution rate. Pseudotetracha blackburni clade 2 shows a meioformula of the type n = 11 + XY, the same as that found in the related taxon P. australis. Previous data for P. whelani, with 12 pairs of autosomes and an XY sex chromosome system, are confirmed in this survey. The multiple chiasmatic sex chromosome system of P. blackburni clade 1 is considered to be of recent origin and with an evolutionarily short‐life confined to this species, where close relatives exhibit simple genetic systems, in contrast to the long evolutionary life of the multiple achiasmatic sex chromosome system broadly found in the tribes Cicindelini and Collyrini. The implications of this chromosomal rearrangement in terms of recombination and speciation are discussed. The results of this work, together with the available cytogenetic data for other Megacephalini species, are interpreted in the light of recent molecular phylogenies of the tribe, showing evidence of a possible process of karyotypic orthoselection with recurrent cycles of incorporation of autosomes to the heterosome pair and subsequent loss of the Y chromosome in Tetracha and Pseudotetracha.

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“…Megacephalini (>100 species) is a pantropical tribe of beetles which, unlike the tribes described above, are often brightly coloured. The Central and South American genera Cheiloxya Guerin‐Meneville, Oxycheila Dejean and Pseudoxycheila Guerin‐Meneville, originally placed in Megacephalina, have since been excluded based on their phylogenetic placement and sex chromosome system (Vogler & Pearson, ; Galián et al ., ; Proença et al ., ). These three genera have not been moved to another taxonomic clade to date, despite their distinctiveness.…”

Section: Introductionmentioning

confidence: 97%

“…However, we also take into consideration the wealth of more recent morphological and molecular studies that have developed Wiesner's classification, or shed light on inconsistencies at different taxonomic levels (e.g. Vogler & Pearson, ; Galián et al ., , ; Moravec, , , ; Proença et al ., ; Zerm et al ., ; Ball et al ., ).…”

Section: Introductionmentioning

confidence: 99%

A comprehensive molecular phylogeny of tiger beetles (Coleoptera, Carabidae, Cicindelinae)

Gough

Duran

Kawahara

et al. 2018

Systematic Entomology

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Tiger beetles are a remarkable group that captivates amateur entomologists, taxonomists and evolutionary biologists alike. This diverse clade of beetles comprises about 2300 currently described species found across the globe. Despite the charisma and scientific interest of this lineage, remarkably few studies have examined its phylogenetic relationships with large taxon sampling. Prior phylogenetic studies have focused on relationships within cicindeline tribes or genera, and none of the studies have included sufficient taxon sampling to conclusively examine broad species patterns across the entire subfamily. Studies that have attempted to reconstruct higher-level relationships of Cicindelinae have yielded conflicting results. Here, we present the first taxonomically comprehensive molecular phylogeny of Cicindelinae to date, with the goal of creating a framework for future studies focusing on this important insect lineage. We utilized all available published molecular data, generating a final concatenated dataset including 328 cicindeline species, with molecular data sampled from six protein-coding gene fragments and three ribosomal gene fragments. Our maximum-likelihood phylogenetic inferences recover Cicindelinae as sister to the wrinkled bark beetles of the subfamily Rhysodinae. This new phylogenetic hypothesis for Cicindelinae contradicts our current understanding of tiger beetle phylogenetic relationships, with several tribes, subtribes and genera being inferred as paraphyletic. Most notably, the tribe Manticorini is recovered nested within Platychilini including the genera Amblycheila Say, Omus Eschscholtz, Picnochile Motschulsky and Platychile Macleay. The tribe Megacephalini is recovered as paraphyletic due to the placement of the monophyletic subtribe Oxycheilina as sister to Cicindelini, whereas the monophyletic Megacephalina is inferred as sister to Oxycheilina, Cicindelini and Collyridini. The tribe Collyridini is paraphyletic with the subtribes Collyridina and Tricondylina in one clade, and Ctenostomina in a second one. The tribe Cicindelini is recovered as monophyletic although several genera are inferred as para-or polyphyletic. Our results provide a novel phylogenetic framework to revise the classification of tiger beetles and to encourage the generation of focused molecular datasets that will permit investigation of the evolutionary history of this lineage through space and time.

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Chromosome evolution in tiger beetles: Karyotypes and localization of 18S rDNA loci in Neotropical Megacephalini (Coleoptera, Cicindelidae)

Cited by 7 publications

References 17 publications

Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae)

Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae)

Recent origin of a chiasmatic sex trivalent in Australian Pseudotetracha tiger beetles

A comprehensive molecular phylogeny of tiger beetles (Coleoptera, Carabidae, Cicindelinae)

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