Microgastropods (IMAGE) St. Petersburg State University Caption 1 - Skenea trochoides (Skeneidae); 2 - Anatoma crispata (Anatomidae); 3 - Moelleria costulata (Colonidae); 4 - Leptogyra bujnitzkii (Melanodrymiidae); 5 - Nepotilla amoena (Raphitomidae); 6 - Alvania verrilli (Rissoidae); 7 - Aclis sarsi (Aclididae); 8 - Peringia ulvae (Hydrobiidae); 9 - Skeneopsis planorbis (Skeneopsidae); 10 - Eulima bilineata (Eulimidae); 11 - Onoba improcera (Rissoidae); 12 - Elachisina globuloides (Elachisinidae); 13 - Retusa obtusa (Retusidae); 14 - Philine denticulata (Philinidae); 15 - Diaphana makarovi (Diaphanidae); 16 - Menestho truncatula (Pyramidellidae); 17 - Rissoella globularis (Rissoellidae); 18 - Omalogyra atomus (Omalogyridae) Credit SPbU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.