Gastrocopta sharae sp. n., holotype (MZSP 122725, H = 1.9 mm, D = 1.1 mm). 2. Apertural view; 3. Apertural view, SEM image; 4. Close-up of the aperture, showing dentition; scale bar = 200 μm. 5–6. Gastrocopta sharae sp. n., paratype (MZSP 122726, H = 1.9 mm, D = 1.1 mm). 5. Apertural view; 6. Apertural view, SEM image. 7–11. Other Gastrocopta spp. from Brazil, shown in apertural view. All images in scale to one another and to G. sharae (Figs 2, 3, 5, 6). 7. G. barbadensis, from Trindade Island, SEM image (MZSP 104736, H = 1.9 mm); 8. G. iheringi, probable syntype, from Bolacha, Rio Grande do Sul state (MZSP 7519, H = 2.5 mm); 9. G. oblonga, from Brazil, precise provenance unknown (NMSW unnumbered, H = 2 mm); 10. Gastrocopta servilis, from Fortaleza, Ceará state (MZSP 7520, H = 2 mm); 11. Gastrocopta solitaria, possible holotype, from Fernando de Noronha Archipelago (NHMUK unnumbered, H = 2 mm). 12. Pupisoma dioscoricola, apertural view (MZSP 131101, H = 1.6 mm, D = 1.6 mm). 13–14. Cecilioides consobrina (MZSP 131579, H = 1.9 mm, D = 0.6 mm). 13. Apertural view; 14. Apertural view, SEM image. 15–16. Dysopeas muibum (MZSP 131100, H = 5.4 mm, D = 2.3 mm). 15. Apertural view; 16. Apertural view, SEM image. 17. Stenogyra octogyra, apertural view (MZSP 122731, H = 14.3 mm, D = 3.7 mm). 18–19. Entodina jekylli (MZSP 131092, H = 1.6 mm, D = 3.1 mm). 18. Apertural view, SEM image; 19. Apertural view. 20. Prohappia besckei, apertural view, SEM image (MZSP 131096, H = 1.0 mm, D = 1.8 mm).