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16 results for “Lygaeus”
Fig. 1 in First records of Lygaeus simulans Deckert, 1985 for Albania (Hemiptera: Heteroptera: Lygaeidae: Lygaeinae)
Fig. 1 - Specimen of Lygaeus simulans Deckert, 1985, mountains near Theth, Shkodër, Albania, 21.VI.2014. / Esemplare di Lygaeus simulans Deckert, 1985, montagne vicino a Theth, Shkodër, Albania, 21.VI.2014. (Photo / Foto: Peter LaBelle).
Fig. 4 in First records of Lygaeus creticus Lucas, 1854 (Hemiptera: Heteroptera: Lygaeidae: Lygaeinae) for Albania and France.
Fig. 4.- Lygaeus creticus Lucas, 1854, Corte, Corsica, France. Imago, 14.03.2017. (Photograph: Alexandre Cornuel-Willermoz).
Figs. 1-3 in First records of Lygaeus creticus Lucas, 1854 (Hemiptera: Heteroptera: Lygaeidae: Lygaeinae) for Albania and France.
Figs. 1-3.- Lygaeus creticus Lucas, 1854, Vlorë, Albania. 1.- Imagos, 13.02.2017. 2.- Nymphs, 9.05.2017. 3.- Teneral imago, 4.05.2017. (Photographs: Aleksander Golemaj).
Figuras 9-12 in Una nueva especie de Lygaeus Fabricius, 1794 (Heteroptera: Lygaeidae) de Patagonia (Sudamérica)
Figuras 9-12. Genitalia de las especies de Lygaeus presentes en Patagonia. 9-10. Parámeros. 9. Lygaeus mauli sp. nov. 10. Lygaeus alboornatus, LP = Lóbulo proximal, LD = Lóbulo distal, AIP = Ángulo interior del parámero. Escala: 0,1 mm. 11-12. Espermateca. 11. Lygaeus mauli sp. nov. 12. Lygaeus alboornatus. B = Bulbo, DE= Ducto de la espermateca. Escala: 0,15 mm. / Genitalia of Lygaeus species from Patagonia. 9-10. Parameres. 9. Lygaeus mauli nov. sp. 10. Lygaeus alboornatus. LP = Proximal lobe, LD = Distal lobe, AIP = Internal Paramere Angle. Scale: 0.1 mm. 11-12. Spermatheca. 11. Lygaeus mauli nov. sp. 12. Lygaeus alboornatus. B = Bulb, DE= Spermathecal duct. Scale: 0.15 mm.
Figuras 5-8 in Una nueva especie de Lygaeus Fabricius, 1794 (Heteroptera: Lygaeidae) de Patagonia (Sudamérica)
Figuras 5-8. Pigóforos de las especies de Lygaeus presentes en Patagonia. 5, 7. Lygaeus mauli sp. nov. 5. Vista dorsal. 7. Vista ventral. 6, 8. Lygaeus alboornatus. 6. Vista dorsal. 8. Vista ventral. Escala: 0,5 mm. / Pygophores of Lygaeus species from Patagonia. 5, 7. Lygaeus mauli nov. sp. 5. Dorsal view. 7. Ventral view. 6, 8. Lygaeus alboornatus. 6. Dorsal View. 8. Ventral view. Scale: 0.5 mm.
Figuras 1-4 in Una nueva especie de Lygaeus Fabricius, 1794 (Heteroptera: Lygaeidae) de Patagonia (Sudamérica)
Figuras 1-4. Habitus de las especies de Lygaeus presentes en Patagonia. 1-2. Lygaeus mauli sp. nov. 1. Macho, 2. Hembra. 3-4. Lygaeus alboornatus. 3. Macho, 4. Hembra. Escala: 1 mm. / Habitus of Lygaeus species from Patagonia. 1-2. Lygaeus mauli nov. sp. 1. Male, 2. Female. 3-4. Lygaeus alboornatus. 3. Male,
Fig. 1 in Short Communication Nuovi dati di Lygaeus creticus Lucas, 1854 in Italia e Corsica (Hemiptera: Heteroptera: Lygaeidae)
Fig. 1 - Esemplare di Lygaeus creticus (foto: Franziska Luthi).
Abb. 1 in Die Oleander-Ritterwanze Lygaeus creticus (Lucas, 1854) hat auch die Schweiz erreicht (Heteroptera, Lygaeidae)
Abb. 1. Kopula von Lygaeus creticus, Bellinzona (TI), 16. März 2019. (Foto Daniel Bolt)
Abb. 2 in Die Oleander-Ritterwanze Lygaeus creticus (Lucas, 1854) hat auch die Schweiz erreicht (Heteroptera, Lygaeidae)
Abb. 2. Fundort von Lygaeus creticus, Bellinzona (TI), 16. März 2019. (Foto Daniel Bolt)
A single pleiotropic locus influences the rate of hybridisation between two sibling species of Lygaeus bugs
The evolution of reproductive isolation lies at the heart of understanding the process of speciation. Of particular interest is the relationship between pre- and post-zygotic reproductive isolation, and the genetic architecture of traits that contribute to one or both forms of reproductive isolation. The sibling species of seed bug <i>Lygaeus equestris</i> and <i>L. simulans</i> show a classic pattern of asymmetric pre-zygotic reproductive isolation, with female <i>L. equestris</i> hybridising with male <i>L. simulans</i>, but with no hybridisation in the reciprocal direction. We have recently described a mutant pale colour form of <i>L. simulans</i>, that inherits as a single Mendelian locus and is pleiotropic for a number of other life history and behavioural traits. Here we tested whether this locus also influences pre- and post-zygotic reproductive isolation. Two sets of experimental crosses revealed that behavioural isolation varied with mutant versus wild-type phenotype for male <i>L. simulans</i>, with the pale form less successful at mating with female <i>L. equestris</i>. In terms of trying to assess post-zygotic isolation, levels of hybrid offspring production were uniformly low across the experiments. However, we did obtain, for the first time, hybrid offspring from a pairing between a female <i>L. simulans</i> and a male <i>L. equestris</i>. In this instance, the female was of the pale mutant genotype. Together with evidence for heterozygote advantage in terms of nymph survival, we consider our results in terms of possible mechanisms of reproductive isolation between this species pair, the role of the pale mutation, and the possible genetic architectures underlying the mutation, from a single gene to a super-gene.
A single pleiotropic locus influences the rate of hybridisation between two sibling species of Lygaeus bugs
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Data from: The fitness effects of a pale mutant in the aposematic seed bug Lygaeus simulans indicate pleiotropy between warning coloration and life history
Conspicuous warning colours that signal chemical or other defences are common in the natural world. For instance, such aposematic warning patterns of red-and-black or yellow-and-black are common among insect taxa, particularly in the order Hemiptera, often forming the basis of Batesian and/or Müllerian mimicry rings. In addition, it has been repeatedly noted that colour polymorphisms or mutants that influence pigmentation can show pleiotropy with other behavioural, physiological or life-history traits. Here we describe a pale mutant of the seed bug Lygaeus simulans that appeared in our lab population in 2012, which differs in colour to the wild-type bugs. Through multigenerational experimental crosses between wild-type and pale mutant L. simulans, we first show that the pale phenotype segregates as a single Mendelian locus, with the pale allele being recessive to the wild-type. Next, we show (1) that there is a large heterozygous advantage in terms of fecundity, (2) that pale females suffer reduced longevity, and (3) that pale males have increased body length compared to wild-type homozygotes. Our data therefore suggest that the colour locus is pleiotropic with a number of life-history traits, opening the door for a more complete genetic analysis of aposematic colouration in this species. In addition, this phenotype will be useful as a visible genetic marker, providing a tool for investigating sperm competition and other post-copulatory drivers of sexual selection in this species.
Fig. 2 in First records of Lygaeus simulans Deckert, 1985 for Albania (Hemiptera: Heteroptera: Lygaeidae: Lygaeinae)
Fig. 2 - View of the valley of Theth, Shkodër, Albania. In the foreground the villages of Theth and Okol, in the background the chain of Mount Maja Harapit. / Vista sulla valle di Theth, Shkodër, Albania. In primo piano i villaggi di Theth e Okol, sullo sfondo la catena del monte Maja Harapit. (Photo / Foto: Giuseppe Popi Miotti, 1993).
Figura 1 in Sobre un notable caso teratológico en Lygaeus analis Dallas, 1852 (Hemiptera: Heteroptera: Lygaeidae)
Figura 1. Ejemplar teratológico de Lygaeus analis. A. Vista dorsal de la cabeza y pronoto. Escala: 1 mm. B. Detalle ojo derecho (normal). Escala: 0,2 mm. C. Detalle ojo izquierdo (reducido). Escala: 0,2 mm. D. Ojo derecho en vista lateral. Escala: 0,5 mm. E. Ojo izquierdo en vista lateral. Escala: 0,5 mm. / Teratological specimen of Lygaeus analis. A. Head and pronotum, dorsal view. Scale: 1 mm. B. Detail of right eye (normal). Scale: 0.2 mm. C. Detail of left eye (reduced). Scale: 0.2 mm. D. Right eye, lateral view. Scale: 0.5 mm. E. Left eye, lateral view. Scale: 0.5 mm.
Figura 13 in Una nueva especie de Lygaeus Fabricius, 1794 (Heteroptera: Lygaeidae) de Patagonia (Sudamérica)
Figura 13. Lygaeus mauli sp. nov., sobre Senecio patagonicus en El Calafate, Santa Cruz, Argentina. Foto: Flavia Raffo. / Lygaeus mauli sp. nov., on Senecio patagonicus from El Calafate, Santa Cruz, Argentina. Photo: Flavia Raffo.
Data from: The fitness effects of a pale mutant in the aposematic seed bug Lygaeus simulans indicate pleiotropy between warning coloration and life history
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