Pit snails
| Pit snails | ||||||||||||
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| Scientific name | ||||||||||||
| Lacuninae | ||||||||||||
| Gill , 1871 |
The Grübchenschnecken (Lacuninae) are a subfamily of snails , which are located exclusively in the sea.
Features and way of life
The habitat of pit snails is the algae zone of the North Atlantic and the North and Baltic Seas . The species can be found from the beach line to a depth of 20 m. They have a winding case . Some species show a sexual dimorphism, which is expressed externally in a considerable difference in size between the females and the males, which are only half as large in these cases.
Veliger larvae , which are part of the sea plankton and are spread by the ocean currents, hatch from the eggs laid in ring-shaped clutches .
The banded pit snail ( Lacuna vincta , Montagu 1803), the flat pit snail ( Lacuna pallidula , Da Costa 1778), and the small pit snail ( Lacuna parva , Da Costa 1778) are also native to the North and Baltic Seas.
Systematics
The pit snails were set up by Theodore Nicholas Gill in 1871 as the Lacunidae family and were then run as a separate family for a long time, but according to the system of Bouchet and Rocroi from 2005 as the subfamily Lacuninae, they belong to the perimeter snails (Littorinidae). Johannes Thiele placed the pit snails with the mesogastropods ( middle snails ), an order of the front gill snails (prosobranchia). They currently belong to the Sorbeoconcha order established by Ponder and Lindberg in 1997 .
According to Bouchet and Rocroi, the Lacuninae include five genera:
- Bembicium Philippi, 1846
- Cremnoconchus Blanford, 1869
- Lacuna Turton , 1827 - Synonym: Aquilonaria Dall , 1886
- Pellilitorina Pfeffer in Martens & Pfeffer, 1886
- Risellopsis Kesteven, 1902
literature
- Philippe Bouchet & Jean-Pierre Rocroi: Part 2. Working classification of the Gastropoda . Malacologia, 47: 239-283, Ann Arbor 2005 ISSN 0076-2997