Rissoelloidea Gray 1850

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

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).

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).