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81 results for “Macrostomum”
FIGURE 6 in Macrostomum shenda and M. spiriger, two new brackish-water species of Macrostomum (Platyhelminthes: Macrostomorpha) from China
FIGURE 6. Macrostomum spiriger Wang & Xin, n. sp.: (A) horizontal whole body section; (B–D) different sections of the seminal bursa and female antrum; (E) the highly lobulate testes; (F–H) longitudinal whole body sections.
FIGURE 3 in Macrostomum shenda and M. spiriger, two new brackish-water species of Macrostomum (Platyhelminthes: Macrostomorpha) from China
FIGURE 3. Macrostomum shenda Wang & Xin, n. sp.: (A) mounted specimen, ventral view; (B) horizontal whole body section; (C–F) longitudinal whole body sections.
FIGURE 2 in Macrostomum shenda and M. spiriger, two new brackish-water species of Macrostomum (Platyhelminthes: Macrostomorpha) from China
FIGURE 2. Macrostomum shenda Wang & Xin, n. sp.: (A) mature living animal (slightly squeezed), ventral view; (B) testes and ovaries; (C) male copulatory apparatus; (D) penis stylet; (E–F) sperm.
FIGURE 10 in Macrostomum shenda and M. spiriger, two new brackish-water species of Macrostomum (Platyhelminthes: Macrostomorpha) from China
FIGURE 10. The phylogenetic tree of 28S rDNA sequences generated with Maximum Likelihood method (bootstrap=1000, TIM3e+I+G4).
FIGURE 11 in Macrostomum shenda and M. spiriger, two new brackish-water species of Macrostomum (Platyhelminthes: Macrostomorpha) from China
FIGURE 11. The phylogenetic tree of 28S rDNA sequences generated with Bayesian-inference method (GTR+I+G).
Seminal fluid-mediated fitness effects in the simultaneously hermaphroditic flatworm Macrostomum lignano
<p>As a class, seminal fluid proteins are expected to exert strong effects on mating partners due to the selection pressures of sperm competition and sexual conflict. But because of the complexity of this secretion, linking specific proteins to downstream effects on own fitness – via manipulating the reproductive behavior, physiology and ultimately the sperm utilization of mating partners – is not straightforward. Here we adopted a systematic gene knockdown approach to screen for seminal fluid-mediated fitness effects in the simultaneously hermaphroditic flatworm <i>Macrostomum lignano</i>. We focused on 18 transcripts in <i>M. lignano</i> seminal fluid, testing how their RNA interference-induced knockdown impacted on three aspects of donor (male) reproductive success: (i) fertility (offspring production of the partner); (ii) defensive sperm competitive ability, <i>P</i><sub>1</sub>; and (iii) offensive sperm competitive ability, <i>P</i><sub>2</sub>. In general, the knockdown of most individual transcripts appeared to have only a minor impact on male reproductive success, though we found evidence that the knockdown of up to five different transcripts impacted on fertility; the knockdown of two other transcripts resulted in reduced <i>P</i><sub>2</sub>, and knockdown of a further transcript actually increased <i>P</i><sub>2</sub>. We thus identify a number of candidate seminal fluid transcripts that appear to modulate offspring production and sperm competitiveness in <i>M. lignano</i>. That only a minority of transcripts exhibit such a pattern likely reflects both the difficulty of accurately estimating sperm competitiveness and the functional redundancy of seminal fluid.</p>
FIGURE 1 in Three new species of freshwater Macrostomum (Platyhelminthes, Macrostomida) from southern China
FIGURE 1. The locations of three new species of Macrostomum in China
FIGURE 1 in Two new species of brackish-water Macrostomum (Platyhelminthes, Macrostomida) from southern China
FIGURE 1. The locations of two new species of brackish-water Macrostomum in southern China
FIGURE 8 in Two new species of brackish-water Macrostomum (Platyhelminthes, Macrostomida) from southern China
FIGURE 8. Macrostomum baoanensis Wang & Fang, n. sp.: (A–C) penis stylet; (D) mature sperm.
FIGURE 1 in Two new brackish-water species of Macrostomum (Platyhelminthes, Macrostomida) from mangrove wetland in southern China
FIGURE 1. The locations of the two new species of Macrostomum in Guangdong Province, China.
Supplementary material 1 from: Shi Y, Zeng Z, Wang J, Zhang S, Deng L, Wang A (2022) Three new species of Macrostomum (Platyhelminthes, Macrostomorpha) from China and Australia, with notes on taxonomy and phylogenetics. ZooKeys 1099: 1-28. https://doi.org/10.3897/zookeys.1099.72964
Table S1
Supplementary material 5 from: Shi Y, Zeng Z, Wang J, Zhang S, Deng L, Wang A (2022) Three new species of Macrostomum (Platyhelminthes, Macrostomorpha) from China and Australia, with notes on taxonomy and phylogenetics. ZooKeys 1099: 1-28. https://doi.org/10.3897/zookeys.1099.72964
Figure S2
Supplementary material 6 from: Shi Y, Zeng Z, Wang J, Zhang S, Deng L, Wang A (2022) Three new species of Macrostomum (Platyhelminthes, Macrostomorpha) from China and Australia, with notes on taxonomy and phylogenetics. ZooKeys 1099: 1-28. https://doi.org/10.3897/zookeys.1099.72964
Figure S3
Supplementary material 4 from: Shi Y, Zeng Z, Wang J, Zhang S, Deng L, Wang A (2022) Three new species of Macrostomum (Platyhelminthes, Macrostomorpha) from China and Australia, with notes on taxonomy and phylogenetics. ZooKeys 1099: 1-28. https://doi.org/10.3897/zookeys.1099.72964
Figure S1
Supplementary material 7 from: Shi Y, Zeng Z, Wang J, Zhang S, Deng L, Wang A (2022) Three new species of Macrostomum (Platyhelminthes, Macrostomorpha) from China and Australia, with notes on taxonomy and phylogenetics. ZooKeys 1099: 1-28. https://doi.org/10.3897/zookeys.1099.72964
Figure S4
Supplementary material 3 from: Shi Y, Zeng Z, Wang J, Zhang S, Deng L, Wang A (2022) Three new species of Macrostomum (Platyhelminthes, Macrostomorpha) from China and Australia, with notes on taxonomy and phylogenetics. ZooKeys 1099: 1-28. https://doi.org/10.3897/zookeys.1099.72964
Table S3
Supplementary material 2 from: Shi Y, Zeng Z, Wang J, Zhang S, Deng L, Wang A (2022) Three new species of Macrostomum (Platyhelminthes, Macrostomorpha) from China and Australia, with notes on taxonomy and phylogenetics. ZooKeys 1099: 1-28. https://doi.org/10.3897/zookeys.1099.72964
Table S2
FIGURE 1 in Macrostomum shenda and M. spiriger, two new brackish-water species of Macrostomum (Platyhelminthes: Macrostomorpha) from China
FIGURE 1. The locations of the two new species of Macrostomum in Guangdong Province, China.
Seminal fluid-mediated fitness effects in the simultaneously hermaphroditic flatworm Macrostomum lignano
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FIGURE 13 in Two new brackish-water species of Macrostomum (Platyhelminthes, Macrostomida) from mangrove wetland in southern China
FIGURE 13. The phylogenetic tree of the concatenated sequences of 18S and 28S rDNA genes with Neighbor-Joining method. (bootstrap=1000, Kimura 2-parameter type)
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