1. Fretter specialised in the study of prosobranch molluscs. 2. Furthermore, the Giant Tun is also a luminescent species; this is an extremely rare characteristic among the prosobranch gastropods. 3. When Neogastropoda was an order, it was placed within the prosobranch gastropods according to the taxonomy developed by Thiele ( 1921 ). 4. Nevertheless, a few of the older terms such as " opisthobranch " and " prosobranch " are still sometimes used in a descriptive way. 5. ""'Sierraia " "'is a genus of freshwater snails with an aquatic prosobranch gastropod mollusks in the family Bithyniidae. 6. ""'Pseudobithynia " "'is a genus of freshwater snails with an aquatic prosobranch gastropod mollusks in the family Bithyniidae. 7. ""'Bithynia leachii " "'is species of small freshwater snail with an aquatic prosobranch gastropod mollusk in the family Bithyniidae. 8. ""'Hydrobioides " "'is a genus of a freshwater snails with an aquatic prosobranch gastropod mollusks in the family Bithyniidae. 9. ""'Gabbia " "'is a genus of a freshwater snails with an aquatic prosobranch gastropod mollusks in the family Bithyniidae. 10. ""'Gabbiella balovalensis " "'is a species of small freshwater snails with an aquatic prosobranch gastropod mollusks in the family Bithyniidae.
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