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5 results for “thelytokous parthenogenesis”
Fig. 3 in The first gynandromorph of a zorapteran and potential thelytokous parthenogenesis in a population of Zorotypus brasiliensis Silvestri (Zoraptera: Zorotypidae)
Fig. 3. Apical abdominal sclerites and genitalia of gynandromorph and normal-type female of Zorotypus brasiliensis Silvestri. (A) Ventral view of sternum VII and sternum VIII of gynandromorph. (B) Dorsal view of genitalia of gynandromorph, showing spermatheca, spermathecal duct, and genital fork (vulva). (C) Ventral view of genitalia of gynandromorph, with lobes labeled according Delamare Deboutteville (1956) and Silvestri (1947). (D) Dissected sternum IX, largely desclerotized, of normal-type female. Scale = 0.1 mm.
Fig. 1 in The first gynandromorph of a zorapteran and potential thelytokous parthenogenesis in a population of Zorotypus brasiliensis Silvestri (Zoraptera: Zorotypidae)
Fig. 1. Bilateral gynandromorph of Zorotypus brasiliensis Silvestri from near Londrina, Paraná, Brazil. (A) Antennae. (B) Left metafemur (male side). Scale = 0.2 mm.
Data from: Facultative use of thelytokous parthenogenesis for queen production in the polyandrous ant Cataglyphis cursor
The evolutionary paradox of sex remains one of the major debates in evolutionary biology. The study of species capable of both sexual and asexual reproduction can elucidate factors important in the evolution of sex. One such species is the ant Cataglyphis cursor, where the queen maximises the transmission of her genes by producing new queens (gynes) asexually while simultaneously maintaining a genetically diverse workforce via the sexual production of workers. We show that the queen can also produce gynes sexually, and may do so to offset the costs of asexual reproduction. We genotyped 235 gynes from 18 colonies, and found that half were sexually produced. A few colonies contained both sexually and asexually produced gynes. While workers in this species can also use thelytoky, we found no evidence of worker production of gynes based on genotypes of 471 workers from the six colonies producing sexual gynes. Gynes are thus mainly, and potentially exclusively, produced by the queen. Simulations of gynes inbreeding level following one to ten generations of automictic thelytoky suggest that the queen switches between or combines thelytoky and sex, which may reduce the costs of inbreeding. This is supported by the relatively small size of inbred gynes in one colony, though we found no relationship between the level of inbreeding and immune parameters. Such facultative use of sex and thelytoky by individual queens contrasts with other known forms of parthenogenesis in ants, which are typically characterised by distinct lineages specialising in one strategy or the other.
Data from: Facultative use of thelytokous parthenogenesis for queen production in the polyandrous ant Cataglyphis cursor
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Fig. 2 in The first gynandromorph of a zorapteran and potential thelytokous parthenogenesis in a population of Zorotypus brasiliensis Silvestri (Zoraptera: Zorotypidae)
Fig. 2. Abdominal apex of gynandromorph and normal-type female of Zorotypus brasiliensis Silvestri. (A) Left lateral view of abdominal apex of gynandromorph depicting male traits typical of many species of Zorotypus (i.e., mating hook and sets of sensilla basiconica). (B) Dorsal view of abdominal apex of gynandromorph (left half is male, right half is female). (C) Apical abdominal view of normal female. (D) Apical view of abdominal apex of normal female with sternum VIII removed to show remnant of sternum IX. Scale = 0.2 mm, except for D = 0.1 mm.
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