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Naturalis Biodiversity Center - RMNH.MOL.170199 - Aylacostoma crenocarina (Moricand, 1841) - Thiaridae - Mollusc shell.jpeg
Aylacostoma crenocarina
Scientific classification

Spix, 1827[1]
Type species
Aylacostoma glabrum Spix, 1827
32 species

Aylacostoma is a

extinct and another is extinct in the wild.[3][4]


Species within genus Aylacostoma include:


The native distribution of this genus includes Central and South America.[2]

Life habits

Some species in this genus used to live in areas of white water in the Yacyretá Rapids,

algae that grow attached to the rocks on the bottom. The water in the area is saturated with oxygen, from the fast-moving waters.[citation needed

Aylacostoma is a

parthenogenic species: the population consists of only females, which increase in number by asexual reproduction. The females give birth to a small number of larvae, no more than three, that are born very well developed, so they have the physical strength needed to attach to a rock and resist the strong current.[citation needed

Conservation status

With the building in 1993 of the


  1. ^ Spix J. B. von (1827). Testacea fluviatilia quae in itinere per Brasiliam annis MDCCCXVII-MDCCCXX. page 15.
  2. ^ .
  3. ^ a b c Vogler (2013). The Radula of the Extinct Freshwater Snail Aylacostoma stigmaticum (Caenofastropoda: Thiaridae) from Argentina and Paraguay. Malacologia 56 (1-2): 329-332.
  4. ^ a b Vogler, Beltramino, Strong & Rumi (2015). A phylogeographical perspective on the ex situ conservation of Aylacostoma (Thiaridae, Gastropoda) from the High Paraná River (Argentina–Paraguay). Zoological Journal of the Linnean Society 174(3): 487-499.
  5. . Retrieved 16 November 2021.

External links

  • Simone L. R. L. (2006). Land and freshwater molluscs of Brazil: an illustrated inventory on the Brazilian malacofauna, including neighbour regions of the South America, respect to the terrestrial and freshwater ecosystems. São Paulo: FAPESP, 390 pp.