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Maxi Polihronakis Richmond – One of the best experts on this subject based on the ideXlab platform.

  • The role of Aedeagus size and shape in failed mating interactions among recently diverged taxa in the Drosophila mojavensis species cluster
    BMC evolutionary biology, 2014
    Co-Authors: Maxi Polihronakis Richmond
    Abstract:

    Investigating the evolution of species-specific insect genitalia is central to understanding how morphological diversification contributes to reproductive isolation and lineage divergence. While many studies evoke some form of sexual selection to explain genitalia diversity, the basis of selection and the mechanism of heterospecific mate exclusion remains vague. I conducted reciprocal mate pair trials in the Drosophila mojavensis species cluster to quantify the frequency of failed insemination attempts, historically referred to as pseudocopulation, between lineages with discrete size and shape differences of the male Aedeagus. In cross-taxon matings Aedeagus size had a significant effect on pseudocopulation frequencies, while Aedeagus shape and genetic distance did not. The direction of the size difference was an important factor for successful mating. When females were mated to a cross-taxon male with a larger Aedeagus than males from her own species, the pair could not establish a successful mating interaction. Females mated to cross-taxon males with a smaller Aedeagus than conspecific males were able to establish the mating interaction but had issues disengaging at the end of the interaction. The results of this study support a role for Aedeagus size in the male-female mating interaction, with a secondary role for Aedeagus shape. In natural populations, mating failure based on Aedeagus size could serve as an important reproductive isolating mechanism resulting in failed insemination attempts after both the male and female show a willingness to mate.

  • Evolution of reproductive morphology among recently diverged taxa in the Drosophila mojavensis species cluster
    Ecology and evolution, 2012
    Co-Authors: Maxi Polihronakis Richmond, Sarah Johnson, Therese A. Markow
    Abstract:

    The morphological evolution of sexual traits informs studies of speciation due to the potential role of these characters in reproductive isolation. In the current study, we quantified and compared genitalic variation within the Drosophila mojavensis species cluster to infer the mode of evolution of the male Aedeagus. This system is ideal for such studies due to the opportunity to test and compare levels of variation along a divergence continuum at various taxonomic levels within the group. Shape variation was quantified using elliptic Fourier descriptors and compared among the four D. mojavensis host races, and between D. mojavensis and its sister species Drosophila arizonae. Aedeagus shape was diagnostic for D. arizonae, and among three of the four D. mojavensis subspecies. In each of these cases, there was less variation within subspecies than among subspecies, which is consistent with the pattern predicted if genitalia are evolving according to a punctuated change model, and are involved with mate recognition. However, Aedeagus shape in Drosophila mojavensis sonorensis was highly variable and broadly overlapping with the other three subspecies, suggesting Aedeagus evolution in this subspecies is more complex and subject to additional evolutionary factors. These results are interpreted and discussed in the context of selection on mate recognition systems and the potential for failed copulation.

Osamu Iwahashi – One of the best experts on this subject based on the ideXlab platform.

  • aedeagal length of the oriental fruit fly bactrocera dorsalis hendel diptera tephritidae and its sympatric species in thailand and the evolution of a longer and shorter Aedeagus in the parapatric species of b dorsalis
    Applied Entomology and Zoology, 2001
    Co-Authors: Osamu Iwahashi
    Abstract:

    To compare the aedeagal length of sympatric species of Bactrocera fruit flies in Thailand, 340 specimens, which were collected with methyl eugenol traps from 7 localities, were examined. Based on aedeagal length and the costal marking at the apex of the wing, males were divided into 5 groups, i.e., a longer Aedeagus with a continuous marking (LC, n=233), a longer Aedeagus with a discontinuous marking (LD, n=2), a shorter Aedeagus with a continuous marking (SC, n=7), a shorter Aedeagus with a discontinuous marking (SD, n=97), and a very long Aedeagus with a discontinuous marking (LLD, n=1). Using the CABIKEY (White and Hancock, 1997, Windows CD-ROM, CAB International, Wallingford), males of the LC and SD groups were determined to be B. dorsalis (Hendel) and B. correcta (Bezzi), respectively. The SC group was similar to B. dorsalis; however, all males of this group had a very narrow costal marking different from the typical B. dorsalis. The aedeagal lengths (without distiphallus) differed significantly among the 3 groups (ANCOVA, F=307.02, p<0.0001): the LC group (2.727±0.111 mm, mean±SD), the SC group (2.201±0.065 mm) and the SD group (2.063±0.075 mm). The aedeagal length of the LD group was 2.33–2.34 mm. This group resembled B. zonata (Saunders), however; they differed from the CABIKEY B. zonata in possessing a very small spot-like costal marking at the apex of the wing. The aedeagal length of one male of the LLD group was 4.17 mm. This male resembled B. tuberculata (Bezzi), but differed somewhat from the CABIKEY B. tuberculata. Thus, specimens of the SC, LD and LLD groups could not be accurately placed. The aedeagal length of B. dorsalis was compared with those of the parapatric species, B. papayae and B. carambolae, and potential factors affecting a longer and shorter aedeagal length are discussed.

  • Aedeagal length of the Oriental fruit fly, Bactrocera dorsalis (Hendel)(Diptera:Tephritidae), and its sympatric species in Thailand and the evolution of a longer and shorter Aedeagus in the parapatric species of B.dorsalis
    Applied Entomology and Zoology, 2001
    Co-Authors: Osamu Iwahashi
    Abstract:

    To compare the aedeagal length of sympatric species of Bactrocera fruit flies in Thailand, 340 specimens, which were collected with methyl eugenol traps from 7 localities, were examined. Based on aedeagal length and the costal marking at the apex of the wing, males were divided into 5 groups, i.e., a longer Aedeagus with a continuous marking (LC, n=233), a longer Aedeagus with a discontinuous marking (LD, n=2), a shorter Aedeagus with a continuous marking (SC, n=7), a shorter Aedeagus with a discontinuous marking (SD, n=97), and a very long Aedeagus with a discontinuous marking (LLD, n=1). Using the CABIKEY (White and Hancock, 1997, Windows CD-ROM, CAB International, Wallingford), males of the LC and SD groups were determined to be B. dorsalis (Hendel) and B. correcta (Bezzi), respectively. The SC group was similar to B. dorsalis; however, all males of this group had a very narrow costal marking different from the typical B. dorsalis. The aedeagal lengths (without distiphallus) differed significantly among the 3 groups (ANCOVA, F=307.02, p

  • Correlation of length of terminalia of males and females among nine species of Bactrocera (Diptera: Tephritidae) and differences among sympatric species of B. dorsalis complex
    Annals of the Entomological Society of America, 1997
    Co-Authors: Ren Iwaizumi, Masashi Kaneda, Osamu Iwahashi
    Abstract:

    The lengths of the male Aedeagus and the female aculeus were measured in 9 Bactrocera fruit fly species. A significant linear correlation was observed between the length of Aedeagus and the length of the aculeus. It is noteworthy that B. papayae Drew & Hancock and B. philippinensis Drew & Hancock have extremely long aedeagi. Previously, differentiation between males in 2 sets of sympatric species, B. papayae versus B. carambolae Drew & Hancock, and B. philippinensis versus B. occipitalis (Bezzi), was extremely difficult. However, observed differences in the length of the Aedeagus and aculeus now provides means to distinguish clearly between some sympatric species within the B. dorsalis complex, and identify accurately both males and females to species.

Albino M. Sakakibara – One of the best experts on this subject based on the ideXlab platform.

  • Figures 87 – 94 In The Identity Of The Treehopper Genus Dysyncritus Fowler, With Descriptions Of New Related Taxa (Hemiptera: Membracidae: Heteronotinae)
    , 2014
    Co-Authors: Olivia Evangelista, Camilo Flórez-v, Albino M. Sakakibara
    Abstract:

    FIGURES 87 – 94. Allodrilus colombiensis Evangelista sp. nov. (holotype male, MPUJ): 87 – 88. Abdomen, lateral and ventral view (pygofer removed), respectively; 89. Pygofer, lateral view; 90 – 91. Pygofer (Aedeagus, style, and subgenital plate removed), latero-caudal and caudal view, respectively; 92 – 93. Aedeagus and styles, lateral and ventral view, respectively; 94. Subgenital plate, ventral view.

  • Figures 70 – 78 In The Identity Of The Treehopper Genus Dysyncritus Fowler, With Descriptions Of New Related Taxa (Hemiptera: Membracidae: Heteronotinae)
    , 2014
    Co-Authors: Olivia Evangelista, Camilo Flórez-v, Albino M. Sakakibara
    Abstract:

    FIGURES 70 – 78. Allodrilus nitidipennis (Funkhouser) comb. nov.: 70 – 71. Abdomen, lateral and ventral view, respectively, abdominal segments indicated. 72. Pygofer, lateral view; 73. Pygofer, caudal view; 74. Subgenital plate and Aedeagus, ventral view; 75 – 76. Aedeagus and style, respectively, lateral view; 77. VIII sternite, ventral view (indicated); 78. Hind tibia, lateral view (setal rows indicated); aa: aedeagal aphophysis.

Mejdalani Gabriel – One of the best experts on this subject based on the ideXlab platform.

  • FIGURES 1 – 7 in The sharpshooter genus Iragua Melichar: a new Colombian species, the female of I. ferruginea Cavichioli, and a key to males of the genus (Insecta: Hemiptera: Cicadellidae: Cicadellini)
    , 2017
    Co-Authors: Cavichioli, Rodney R., Mejdalani Gabriel
    Abstract:

    FIGURES 1 – 7. Iragua albinoi sp. nov., male holotype. 1, dorsal habitus (length 9.2 mm). 2, genital capsule, lateral view (scale bar: 0.5 mm). 3, pygofer, valve, and subgenital plate, ventral view. 4, connective and style, dorsal view. 5, ejaculatory reservoir, Aedeagus, and anal tube, lateral view. 6, Aedeagus, caudal view. 7, paraphyses, dorsal view. ASH: aedeagal shaft; ATR: aedeagal atrium; BDA: aedeagal basidorsal apodeme; PYG: pygofer; RAM: paraphyses ramus; SGP: subgenital plate; STK: paraphyses stalk; UNP: aedeagal unciform process; VAL: valve

  • Figure 1 from: Felix M, Antunes C, Carvalho RA, Mejdalani G (2015) Three new species of Fonsecaiulus (Hemiptera, Cicadellidae, Cicadellini) from Brazil and key to species of the genus. ZooKeys 526: 131-144. https://doi.org/10.3897/zookeys.526.6154
    , 2015
    Co-Authors: Felix Márcio, Antunes Cauan, Carvalho, Rachel A., Mejdalani Gabriel
    Abstract:

    Figure 1 – Fonsecaiulus rectangularis sp. n., male holotype. a body, dorsal view b body, lateral view c pygofer, lateral view d apical left portion of pygofer, posterior view e valve and subgenital plates, ventral view f left style and connective, dorsal view g Aedeagus and paraphyses, lateral view h Aedeagus and paraphyses, ventral view. Body length: 5.5 mm

  • Figure 2 from: Felix M, Antunes C, Carvalho RA, Mejdalani G (2015) Three new species of Fonsecaiulus (Hemiptera, Cicadellidae, Cicadellini) from Brazil and key to species of the genus. ZooKeys 526: 131-144. https://doi.org/10.3897/zookeys.526.6154
    , 2015
    Co-Authors: Felix Márcio, Antunes Cauan, Carvalho, Rachel A., Mejdalani Gabriel
    Abstract:

    Figure 2 – Fonsecaiulus guttiformis sp. n., male holotype. a body, dorsal view b body, lateral view c pygofer, lateral view d valve and subgenital plates, ventral view e left style and connective, dorsal view f ejaculatory reservoir, Aedeagus, and paraphyses, lateral view g part of ejaculatory reservoir, Aedeagus, and paraphyses, ventral view. Body length: 5.4 mm

Therese A. Markow – One of the best experts on this subject based on the ideXlab platform.

  • Evolution of reproductive morphology among recently diverged taxa in the Drosophila mojavensis species cluster
    Ecology and evolution, 2012
    Co-Authors: Maxi Polihronakis Richmond, Sarah Johnson, Therese A. Markow
    Abstract:

    The morphological evolution of sexual traits informs studies of speciation due to the potential role of these characters in reproductive isolation. In the current study, we quantified and compared genitalic variation within the Drosophila mojavensis species cluster to infer the mode of evolution of the male Aedeagus. This system is ideal for such studies due to the opportunity to test and compare levels of variation along a divergence continuum at various taxonomic levels within the group. Shape variation was quantified using elliptic Fourier descriptors and compared among the four D. mojavensis host races, and between D. mojavensis and its sister species Drosophila arizonae. Aedeagus shape was diagnostic for D. arizonae, and among three of the four D. mojavensis subspecies. In each of these cases, there was less variation within subspecies than among subspecies, which is consistent with the pattern predicted if genitalia are evolving according to a punctuated change model, and are involved with mate recognition. However, Aedeagus shape in Drosophila mojavensis sonorensis was highly variable and broadly overlapping with the other three subspecies, suggesting Aedeagus evolution in this subspecies is more complex and subject to additional evolutionary factors. These results are interpreted and discussed in the context of selection on mate recognition systems and the potential for failed copulation.