Photo of the day (47): Lithoglyphus naticoides

Lithoglyphus naticoides is a freshwater snail. Its distribution is Pontic and Danubian.

Shells from my collection comes from Danube river in Slovakia. The apertural view of the shell looks like this. The width of the shell is 8.5 mm and the height of the shell is 8.5 mm:

shell of Lithoglyphus naticoidesOblique view of the same shell:

an oblique view of the shell of Lithoglyphus naticoidesIt lives on the muddy bottom, and it can not lay egg capsules on stones. Therefore is lay egg capsules on shells of other Lithoglyphus naticoides snails. Remains of egg capsules on the shell of Lithoglyphus naticoides:

the shell of Lithoglyphus naticoides with egg capsulesthe shell of Lithoglyphus naticoides with egg capsulesDried egg capsules that have a dried embryo inside:

the shell of Lithoglyphus naticoides with egg capsulesthe shell of Lithoglyphus naticoides with egg capsulesthe shell of Lithoglyphus naticoides with egg capsules

The width of the following shell is 7.0 mm and the height of the shell is 7.0 mm.

apertural view of the shell of Lithoglyphus naticoidesapical view of the shell of Lithoglyphus naticoideslateral view of the shell of Lithoglyphus naticoidesumbilical view of the shell of Lithoglyphus naticoidesI wanted to see a color photo of an operculum of Lithoglyphus naticoides, but I found color drawings on the internet only and black-and-white photo of an operculum in books. So I made few photos of an operculum of Lithoglyphus naticoides.

The width of the operculum is 3.0 mm and the height of the operculum is 4.0 mm. It is the operculum from the shell above. Outer side of the operculum:

outer side of an operculum of Lithoglyphus naticoidesInner side of the operculum:

inner side of an operculum of Lithoglyphus naticoidesReferences

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Photo of the day (36): Flood deposits of Danube

Flood deposits include flood debris and shells of molluscs. Such assemblages of dead remnants of molluscs are called thanatocoenoses. Shells may com from any locality anywhere in the upper river drainage, but you can get shells of some species, that can not be obtained easily.

Flood debris from the Danube river in Slovakia:
Flood deposits of Danube in SlovakiaIt may seem, that there are only valves of a freshwater bivalve Corbicula fluminea.
flood deposits of Danube

But after a closer look there are many gastropod shells too. The following species of gastropods can be recognized on the photo:

  • Esperiana esperi – one oblong shell with dots in the right center
  • Esperiana daudebartii acicularis – one oblong shell on the top
  • Theodoxus fluviatilis – a small black shell with white dots in the center
  • Theodoxus danubialis – larger striped shells with a flat apertural plain
  • Lithoglyphus naticoides – white globular shells without the apertural plain

flood deposits of Danube - detail

There are also bivalves:

  • Corbicula fluminea – brown rounded ribbed valves
  • Dreissena polymorpha – two triangular valves on the top