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FIG. 18 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 18. — Calliaster mamillifer Alcock, 1893: A, abactinal; B, actinal surfaces of the syntype; MNHN-IE-2014-162. Scale bar: 10 mm.
FIG. 17 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 17. — Asterina lorioli Koehler, 1910: A, abactinal; B, actinal surfaces of the syntype; MNHN-IE-2014-97. Scale bar: 20 mm.
FIG. 16 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 16. — Scytaster indicus: A, abactinal; B, actinal surfaces of the holotype; MNHN-IE-2014-187. Scale bar: 10 mm.
FIG. 15 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 15. — Ganeria hahni Perrier, 1891: A, abactinal; B, actinal surfaces of the holotype; MNHN-IE-2014-84. Scale bar: 50 mm.
FIG. 5 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 5. — Linckia bouvieri Perrier, 1875: A, abactinal; B, actinal surfaces of a syntype, MNHN-IE-2013-4450. Scale bar: 20 mm.
FIG. 14 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 14. — Zoroaster gilesii Alcock, 1893: A, actinal and B, abactinal surfaces of the syntype; MNHN-IE-2014-357. Scale bar: 10 cm.
FIG. 8 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 8. — Asteriscus cepheus Müller & Troschel, 1842; A, abactinal; B, actinal surfaces of the holotype; MNHN-IE-2014-98. Scale bar: 20 mm.
FIG. 13 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 13. — Stellasteropsis fouadi Dollfus, 1936: A, abactinal; B, actinal surfaces of the lectotype; MNHN-IE-2014-49. Scale bar: 10 mm.
FIG. 9 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 9. — Persephonaster coelochilus Alcock, 1893: A, actinal surface; B, profile view and C, abactinal surface of the syntype; MNHN-IE-2014-115. Scale bar: 50 mm.
FIG. 4 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 4. — Zoroaster barathri Alcock, 1893: A, abactinal; B, actinal surfaces of the syntype; MNHN-IE-2014-413. Scale bar: 10 mm.
FIG. 11 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 11. — Persephonaster croceus Wood-Mason & Alcock, 1891: A, abactinal; B, actinal surfaces of the syntype; MNHN-IE-2014-432. Scale bar: 20 mm.
FIG. 10 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 10. — Culcita coriacea Müller & Troschel, 1842: A, abactinal; B, actinal surfaces of the syntype; MNHN-IE-2014-461. Scale bar: 50 mm.
FIG. 3 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 3. — Pentaceros alveolatus Perrier, 1875: A, abactinal; B, actinal surface of a syntype; MNHN-IE-2014-479. Scale bar: 50 mm.
FIG. 2 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 2. — Astropecten alatus Perrier, 1875: A, abactinal; B, actinal surfaces of the holotype; MNHN-IE-2014-4. Scale bar: 20 mm.
FIG. 7 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 7. — Stolasterias candicans Ludwig, 1803: A, abactinal; B, actinal surfaces of the syntype; MNHN-IE-2014-447. Scale bar: 20 mm.
FIG. 6 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 6. — Asteriscus calcaratus Perrier, 1869: A, abactinal; B, actinal surfaces of the holotype; MNHN-IE-2014-443. Scale bar: 10 mm.
Data from: Hybrid incompatibility between D. virilis and D. lumei is stronger in the presence of transposable elements
<p>Mismatches between parental genomes in selfish elements are frequently hypothesized to underlie hybrid dysfunction and drive speciation. However, because the genetic basis of most hybrid incompatibilities is unknown, testing the contribution of selfish elements to reproductive isolation is difficult. Here we evaluated the role of transposable elements (TEs) in hybrid incompatibilities between Drosophila virilis and D. lummei by experimentally comparing hybrid incompatibility in a cross where active TEs are present in D. virilis (TE+) and absent in D. lummei, to a cross where these TEs are absent from both D. virilis (TE-) and D. lummei genotypes. Using genomic data, we confirmed copy number differences in TEs between the D. virilis (TE+) strain and the D. virilis (TE-) strain and D. lummei. We observed F1 postzygotic reproductive isolation exclusively in the interspecific cross involving TE+ D. virilis but not in the cross involving TE- D. virilis. This precisely mirrors the intraspecies dysgenic phenotype where teste atrophy only occurs when TE+ D. virilis is the paternal parent. A series of backcross experiments, designed to account for alternative models of hybrid incompatibility, showed that both F1 hybrid incompatibility and intrastrain dysgenesis is consistent with the action of TEs rather than other, genic, interactions. A further Y-autosome interaction contributes to additional, sex-specific, inviability in one direction of this cross combination. These experiments demonstrate that TEs that cause intraspecies dysgenesis can increase reproductive isolation between closely related lineages, thereby adding to the processes that consolidate speciation.</p>
FIG. 29 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 29. — Zoroaster sigsbeei Perrier, 1881: A, abactinal surface; B, profile view of a syntype; MNHN-IE-2014-282. Scale bar: 10 mm.
FIG. 12. Asterina frigida Koehler, 1917 in The type specimens of extant asteroids (Echinodermata) in the Muséum national d'Histoire naturelle of Paris
FIG. 12. Asterina frigida Koehler, 1917: A, abactinal; B, actinal surfaces of syntypes; MNHN-IE-2014-269. Scale bar: 10 mm.
Fig. 2. Dentalina antennula d in Taxonomy and distribution of recent species of the subfamily Nodosariinae (Foraminifera) in Icelandic waters
Fig. 2. Dentalina antennula d'Orbigny, 1846. A, D. Microsphere (BIOICE 2398; IINH 40362) side view (A), and aperture (D). B–C. Megalosphere (BIOICE 2222, IINH 40365), side view (B) and aperture (C), stained with indigo blue. Light source incident light and dark field. Scale bars = 0.25 mm.
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