Collared moon snail
| Collared moon snail | ||||||||||||
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Housing of Lunatia catena |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Euspira catena | ||||||||||||
| da Costa , 1778 |
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The Euspira Catena , collar Navel screw or Large umbilical screw ( Euspira catena , Syn. : Lunatia catena ) is a screw from the family of the moon screw extending from molluscs fed. It lives in the North Sea , the northeast Atlantic and the Mediterranean .
features
The round, almost spherical snail shell of Lunatia catena , which in adult snails with 6 to 7 whorls and up to 3 cm in length and width, has a slightly raised thread with graduated whorls, a deep navel and a very wide body circumference that covers most of the Occupies total height. The surface is smooth, the basic color yellowish, and below the seam, following its spiral course, there is a series of elongated, oblique red-brown spots.
The operculum of the collar moon snail is ear-shaped and spirally wound.
The animal is yellowish to cream-colored with red-brown spots. The snail's head has a short snout and two flattened antennae. In the active animal, the large foot covers the head and part of the housing. Its propodium is used to plow through the sandy subsoil.
The collar-shaped clutches formed from sand and jelly (" sand collars ") of the separate-sex collar moon snail are about 1.5 to 2.2 mm thick. They have a diameter of about 7.3 cm at the base and about 4.7 cm at the top. The egg capsules, which are about 1.5 to 2 mm in size, each contain about 2 to 4 fertile eggs, but also nutritional eggs. The development of the larval stages takes place in the egg capsules. The hatching young animals, finished snails, have a shell length of around 800 μm.
distribution
The collar moon snail occurs in the northeastern Atlantic , in the North Sea to the Skagerrak and in the Mediterranean .
habitat
Lunatia catena lives below the intertidal zone at depths of up to 125 meters and burrows itself in the sand. The empty snail shells are often washed up on the beach where the live animals cannot go.
nutrition
The nocturnal Lunatia catena feeds on mussels , especially telltale mussels and saw teeth , as well as snails , which are searched for by digging with their feet in the sand. The prey is grasped with the foot and a hole is drilled in the shell with the radula . This process can take several hours and takes place buried in the sand. Holes drilled by moon snails are wider on one side than the other.
literature
- Betty Jean Piech: Naticidae and Personidae: A Classification of Recent Species . Delaware Museum of Natural History, Wilmington, DE 1998, 60 pp.
- Frank Riedel: Origin and evolution of the "higher" Caenogastropoda . Berliner Geoscientific Abhandlungen, Series E, Volume 32, Berlin 2000, 240 pages, ISBN 3-89582-077-6 .
Individual evidence
- ↑ a b Erwin Stresemann (Ed.): Excursions fauna. Invertebrates I. SH Jaeckel: Mollusca . People and Knowledge, Berlin 1986. pp. 131f. Naticidae - Umbilical snails: Natica Scopoli, N. catena da Costa.
- ↑ J. Barrett, CM Yonge (1958): Collins Pocket Guide to the Sea Shore . Collins, London.
- ↑ MEC Giglioli: The Egg Masses of the Naticidae (Gastropoda) . Journal of the Fisheries Research Board of Canada, 1955, 12 (2): 287-327, 10.1139 / f55-018
- ↑ World Register of Marine Species , World Marine Mollusca database: Euspira catena (da Costa, 1778)
