Bythinellidae

Bythinellidae is a family of small freshwater snails with an operculum, aquatic gastropod molluscs in the order Littorinimorpha.[1]

Bythinellidae
Shell of Bythinella bouldouyrensis (paratype at MNHN, Paris)
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Order: Littorinimorpha
Superfamily: Truncatelloidea
Family: Bythinellidae
Locard, 1893
Genera

See text"

Their minute shell is often colored. They are characterized by a calcareous operculum, a lobe on the upper surface of the neck. The ctenidium, the respiratory gill-comb, is very broad. They have a ciliary feeding habit. The kidney has a large extension towards the mantle.[2]

Genera

Genera in the family Bythinellidae include:

  • Bythinella Moquin-Tandon, 1856
  • Strandzhia Georgiev & Glöer, 2013
  • Terrestribythinella Sitnikova, Starobogatov & V. Anistratenko, 1992
Genera brought into synonymy
  • Acrophlyctis Cossmann, 1888 †: synonym of Bythinella (Acrophlyctis) Cossmann, 1888 † represented as Bythinella Moquin-Tandon, 1856
  • Bithinella [sic]: synonym of Bythinella Moquin-Tandon, 1856 (incorrect subsequent spelling)
  • Bithynella Moquin-Tandon, 1856: synonym of Bythinella Moquin-Tandon, 1856 (incorrect subsequent spelling)
  • Bythynella: synonym of Bythinella Moquin-Tandon, 1856 (invalid: incorrect subsequent spelling)
  • Microna Frauenfeld, 1863: synonym of Bythinella Moquin-Tandon, 1856
gollark: I suspect SQLite would lose out somewhat in storage efficiency, but it could plausibly be faster for many things at runtime.
gollark: It's less complex for everyone interacting with it, since they can just... use SQLite, which has bindings for everything, instead of "zimlib". And by "efficiency" do you mean "space efficiency" or "lookup efficiency"? Because, as I said, SQLite would probably only add a few bytes per directory entry row, which is not a significant increase.
gollark: SQLite's overhead is pretty low, and the majority of the filesize is from the binary blobs which would remain the same in each.
gollark: It's less complex for them as the code is already there and written with a nice API, and "less efficient" how? Slightly more space on headers?
gollark: You could easily store the directory entry bits as an SQLite table.

References
  1. MolluscaBase eds. (2020). MolluscaBase. Bythinellidae Locard, 1893. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=724571 on 2020-06-27
  2. Lilly, M.M. (1953). "The mode of life and the structure and functioning of the reproductive ducts of Bithynia tentaculata (L.)". Proceedings of the Malacological Society of London. 30 (4–5): 87–110.
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