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24 results for “Asymmetrical genitalia”
Figs. 9 and 10. Male terminalia and genitalia. Fig. 9 in A new tribe of Tropiduchidae (Hemiptera: Fulgoroidea) with revision of the genus Buca and description of asymmetric hind leg spinulation
Figs. 9 and 10. Male terminalia and genitalia. Fig. 9. Male terminalia of Buca simplex Walker (Bolivia); A) terminalia, right lateral view (styli removed); B) dorsal view of anal tube and paraproct (distal margin downward); C) lef gonostylus (hind margin upward); D) detail view of gonostylus capitulum (in dorsal view). Fig. 10. Buca asymmetrospinata sp. nov. male genitalia (paratype); A) terminalia, right lateral view (styli removed); B) distal portion of phallus, ventral view; C) dorsal view of anal tube and paraproct (hind margin right); D) lef gonostylus (hind margin upward); E) detail view of gonostylus capitulum (in dorsal view).
FIGURE 1. The strict consensus tree resulting from the parsimony analysis I in Taxonomy and evolution of asymmetric male genitalia in the subgenus Ashima Chen (Diptera: Drosophilidae: Phortica Schiner), with descriptions of seven new species
FIGURE 1. The strict consensus tree resulting from the parsimony analysis I (PAUP* v4.0a166) of the data matrix of 40 spp. × 66 morphological characters (Appendix 1) for the genus Phortica (especially focusing on the subgenus Ashima). Synapomorphies (solid circle: nonhomoplastic; open circle: homoplastic) inferred from both ACCTRAN and DELTRAN character optimization are indicated on each internal branch along with support values (bootstrap frequency %).
FIGURE 4 in Taxonomy and evolution of asymmetric male genitalia in the subgenus Ashima Chen (Diptera: Drosophilidae: Phortica Schiner), with descriptions of seven new species
FIGURE 4. Phortica (Ashima) andreagigoni Toda & Bänziger, sp. nov. (♂ holotype). A, Antenna; B, periphallic organs (cau- dolateral view); C, aedeagus, phallapodeme, hypandrium and pregonite (lateral view); D, aedeagal sheath, postgonites, hypandrium and pregonites (ventral view). Scale bars: 0.1 mm.
FIGURE 8 in Taxonomy and evolution of asymmetric male genitalia in the subgenus Ashima Chen (Diptera: Drosophilidae: Phortica Schiner), with descriptions of seven new species
FIGURE 8. Phortica (Ashima) kerinciensis Toda, sp. nov. (♂ paratype). A, Antenna; B, posterior portion of scutum (dorsal view); C, medial and posterior sensilla on cibarium (dorsal view); D, fore tarsus; E, abdominal sternites; F, habitus (ventral view); G, periphallic organs (caudolateral view); H, aedeagus and postgonites; I–K, phallic organs (lateral, ventral and ventrolateral views, respectively; B-type). Scale bars: 0.1 mm in A, C, D, G–K; 0.5 mm in B, E, F.
FIGURE 8 in A new species of Lepidotrigona (Hymenoptera: Apidae) from Thailand with the description of males of L. flavibasis and L. doipaensis and comments on asymmetrical genitalia in bees
FIGURE 8. Male of L. flavibasis from the type locality (Doi Suthep, Chang Khian, Chiang Mai, Thailand). (A) dorsal habitus, (B) lateral habitus, and (C) head, frontal view.
FIGURE 2 in A new species of Lepidotrigona (Hymenoptera: Apidae) from Thailand with the description of males of L. flavibasis and L. doipaensis and comments on asymmetrical genitalia in bees
FIGURE 2. Male metasomal sterna, ventral aspect labelled as: (A), (B), and (C) refer to L. satun n. sp. (Paratype, H.B.- GP3311), L. flavibasis (H.B.-GP3322), and L. doipaensis (H.B.-GP3183) respectively, with the number following as (1), (2), (3), and (4) refer to S4, S5, S6, and S7 respectively. All subfigures are shown at the same scale and magnification. Diagonal lines indicate the characters treated in the diagnoses.
FIGURE 1 in A new species of Lepidotrigona (Hymenoptera: Apidae) from Thailand with the description of males of L. flavibasis and L. doipaensis and comments on asymmetrical genitalia in bees
FIGURE 1. Measurements as indicated in the diagnosis and table. (A) pedicel, F1 and F2; (B) head, side view; (C) left metafemur and tibia; (D) left forewing.
FIGURE 7 in A new species of Lepidotrigona (Hymenoptera: Apidae) from Thailand with the description of males of L. flavibasis and L. doipaensis and comments on asymmetrical genitalia in bees
FIGURE 7. Male of L. doipaensis from the mountain near the type locality (Doi Suthep, Chang Khian, Chiang Mai, Thailand). (A) dorsal habitus, (B) lateral habitus, and (C) head, frontal view.
FIGURE 6. Lepidotrigona satun n in A new species of Lepidotrigona (Hymenoptera: Apidae) from Thailand with the description of males of L. flavibasis and L. doipaensis and comments on asymmetrical genitalia in bees
FIGURE 6. Lepidotrigona satun n. sp., head, frontal view. (A) male holotype and (B) worker paratype.
FIGURE 3 in A new species of Lepidotrigona (Hymenoptera: Apidae) from Thailand with the description of males of L. flavibasis and L. doipaensis and comments on asymmetrical genitalia in bees
FIGURE 3. Male genital capsules, labelled as: (A), (B), and (C) refer to L. satun n. sp. (Paratype, H.B.-GP3311), L. flavibasis (H.B.-GP3322), and L. doipaensis (H.B.-GP3183) respectively, with the number following as (1), (2), (3), and (4) refer to dorsal, ventral, lateral, and caudal aspect respectively. All subfigures are shown at the same scale and magnification. Diagonal lines indicate the right penis valve.
Data from: Repeated evolution of asymmetric genitalia and right-sided mating behavior in the Drosophila nannoptera species group
Background: Male genitals have repeatedly evolved left-right asymmetries, and the causes of such evolution remain unclear. The Drosophila nannoptera group contains four species, among which three exhibit left-right asymmetries of distinct genital organs. In the most studied species, Drosophila pachea, males display asymmetric genital lobes and they mate right-sided on top of the female. Copulation position of the other species is unknown. Results: To assess whether the evolution of genital asymmetry could be linked to the evolution of one-sided mating, we examined phallus morphology and copulation position in D. pachea and closely related species. The phallus was found to be symmetric in all investigated species except D. pachea, which display an asymmetric phallus with a right-sided gonopore, and D. acanthoptera, which harbor an asymmetrically bent phallus. In all examined species, males were found to position themselves symmetrically on top of the female, except in D. pachea and D. nannoptera, where males mated right-sided, in distinctive, species-specific positions. In addition, the copulation duration was found to be increased in nannoptera group species compared to closely related outgroup species. Conclusion: Our study shows that gains, and possibly losses, of asymmetry in genital morphology and mating position have evolved repeatedly in the nannoptera group. Current data does not allow us to conclude whether genital asymmetry has evolved in response to changes in mating position, or vice versa.
Data from: Repeated evolution of asymmetric genitalia and right-sided mating behavior in the Drosophila nannoptera species group
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No evidence for asymmetric sperm deposition in a species with asymmetric male genitalia
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FIGURE 5. Lepidotrigona satun n in A new species of Lepidotrigona (Hymenoptera: Apidae) from Thailand with the description of males of L. flavibasis and L. doipaensis and comments on asymmetrical genitalia in bees
FIGURE 5. Lepidotrigona satun n. sp., lateral habitus. (A) male holotype and (B) worker paratype.
FIGURE 4. Lepidotrigona satun n in A new species of Lepidotrigona (Hymenoptera: Apidae) from Thailand with the description of males of L. flavibasis and L. doipaensis and comments on asymmetrical genitalia in bees
FIGURE 4. Lepidotrigona satun n. sp., dorsal habitus. (A) male holotype and (B) worker paratype.
Data from: Distinct copulation positions in Drosophila pachea males with symmetric or asymmetric external genitalia
Left-right asymmetric genitalia have appeared multiple times independently in insects and have been associated with changes in mating positions. However, there is little experimental data on how the evolution of genital asymmetries may have affected the evolution of mating positions or vice versa. As opposed to its closely-related species, Drosophila pachea has a conspicuous asymmetry in its male genitalia external lobes, with the left lobe being 1.49 ± 0.08 (SD) times longer and thinner than the right lobe. In a laboratory stock, we found that 20% of the males possess fully symmetric lobes. To better understand how asymmetric genitalia may affect mating, we compared D. pachea copulation behaviour between these mutant males and wild-type males. We found that D. pachea wild-type males adopt a one-sided mating posture with the male always one-sided 8.55° ± 1.79° (SD) towards the female's right side. Within 45-min recordings, all wild-type males did mate whereas 39% of symmetric mutants failed to form a stable mating complex and did not mate. In successful copulations, symmetric mutants also adopted a right-sided mating posture but the angle between male and female bodies was significantly more variable compared to wild-type males. Our results suggest that lobe size asymmetry is required for the formation of a stable mating complex and for the positioning of the male according to a precise angle on the female. However, lobe size asymmetry is not required for D. pachea right-sided mating posture.
Data from: Distinct copulation positions in Drosophila pachea males with symmetric or asymmetric external genitalia
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FIGURE 7 in Taxonomy and evolution of asymmetric male genitalia in the subgenus Ashima Chen (Diptera: Drosophilidae: Phortica Schiner), with descriptions of seven new species
FIGURE 7. Phortica (Ashima) akutsui Toda, sp. nov. (♂ holotype). A, Head (caudal view); B, frons; C, antenna; D, abdominal sternites; E, periphallic organs (caudolateral view); F, postgonites (anteroventral view); G, H, phallic organs (lateral and ventral views, respectively). Abbreviations: dl t a, dorsolateral, tentorial apodeme; pocl s, postocular setae. Scale bars: 0.1 mm in B, C, E–H; 0.5 mm in A, D.
FIGURE 2 in Taxonomy and evolution of asymmetric male genitalia in the subgenus Ashima Chen (Diptera: Drosophilidae: Phortica Schiner), with descriptions of seven new species
FIGURE 2. Phortica (Ashima) efragmentata Toda, sp. nov. (♂ holotype). A, Antenna; B, palpus; C, cibarium (dorsal view); D, proboscis (lateral view); E, fore tarsus; F, abdomen (dorsal view); G, legs; H, abdominal sternites. Abbreviations: a s, anterior sensilla; m s, medial sensilla; p s, posterior sensilla; s c, sensilla campaniformia; s-I–IV, sternites I–IV; t-I–IV, tergites I–IV. Character states are indicated in the form of 'character No.-state code'. Scale bars: 0.1 mm in A–D; 0.5 mm in E–H.
FIGURE 3 in Taxonomy and evolution of asymmetric male genitalia in the subgenus Ashima Chen (Diptera: Drosophilidae: Phortica Schiner), with descriptions of seven new species
FIGURE 3. Phortica (Phortica) pappi (Tsacas & Okada, 1983) (A; ♂ from Cape Tribulation, Queensland, Australia), Phortica (Ashima) machoruka Prigent & Chen, 2008 (B, C; ♂ holotype), Phortica (Ashima) efragmentata Toda, sp. nov. (D–G; ♂ ho- lotype) and Phortica (Ashima) afoliolata Chen & Toda, 2005 (H; ♂ paratype from Jianfeng, Ledong County, Hainan, China). A, B, D, Periphallic organs (caudolateral view in A and D; caudal view in B); C, pregonites and hypandrial phragma (ventral view); E, surstylus; F, phallic organs (ventral view); G, H, phallic organs (lateral view). Abbreviations: aed gd, aedeagal guide; aed m r, aedeagal median rod; aed s, aedeagal sheath; cerc, cercus; epand, epandrium; goncx, gonocoxite; hypd ph, hypandrial phragma; phap, phallapodeme; phap pr, posterior rod-like process of phallapodeme; preg, pregonite; postg, postgonite; sur, surstylus. Scale bars: 0.1 mm.
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