Back نهيد البحر Arabic فصيله نهيد البحر ARZ Trochidae CEB Kotoučovití Czech Kreiselschnecken German حلزونهای نوکدار FA Pyramidikotilot Finnish Trochidae French Trochidae Italian Trochidae Dutch
| Trochidae | |
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| A shell of Coelotrochus tiaratus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Trochida |
| Superfamily: | Trochoidea |
| Family: | Trochidae Rafinesque, 1815 |
| Subfamilies | |
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See text | |
| Synonyms | |
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The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles a toy spinning top.