Rissoellidae Gray 1850

Figures 1–8.Rissoella morrocoyensis sp. n. 1–5: on a leaf of Thalassia testudinum (1–2), ventral view (3), lateral view (4), dorsal view (5). Rissoella venezolanicola sp. n. 6–8: lateral view (6), ventral view (7), dorsal view (8).

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

Figures 9–12.Rissoella morrocoyensis sp. n. 9–10: view of the aperture and the umbilicus (9) detail of the umbilicus (10). Rissoella venezolanicola sp. n. 11–12: view of the aperture and the umbilicus (11), detail of the umbilicus 12.

Figures 13–17.Rissoella morrocoyensis sp. n.: shell (13), protoconch (14), detail of the umbilicus (15), odontophoral cartilages (16), radular teeth (17).

Figures 1–8.Rissoella morrocoyensis sp. n. 1–5: on a leaf of Thalassia testudinum (1–2), ventral view (3), lateral view (4), dorsal view (5). Rissoella venezolanicola sp. n. 6–8: lateral view (6), ventral view (7), dorsal view (8).

Figures 9–12.Rissoella morrocoyensis sp. n. 9–10: view of the aperture and the umbilicus (9) detail of the umbilicus (10). Rissoella venezolanicola sp. n. 11–12: view of the aperture and the umbilicus (11), detail of the umbilicus 12.

Figures 13–17.Rissoella morrocoyensis sp. n.: shell (13), protoconch (14), detail of the umbilicus (15), odontophoral cartilages (16), radular teeth (17).