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Vermetidae
Vermetidae, common name the worm snails or worm shells, is a taxonomic family of small to medium-sized sea snails, marine gastropod molluscs in the clade Littorinimorpha. The shells of species in the family Vermetidae are extremely irregular, and do not resemble the average snail shell, hence the common name "worm shells" or "worm snails".
These snails usually grow cemented onto a hard surface, or cemented together in colonies.
==Shell description==
These snails do not have typical regularly coiled gastropod shells; instead they have very irregular elongated tubular shells which are moulded to, and cemented to, a surface of attachment such as a rock or another shell and so on. In the adult the apertural part of the shell is usually free, with the opening directed upward. Some species have an operculum and some do not. Damaged sections of the shell can be sealed off by calcareous septa when necessary.
Some vermetids are solitary, whereas others live in colonies, partially cemented together. The shells of species within this family vary greatly and can sometimes be extremely challenging to identify.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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