貝類

1. Origins, structure, and basic meaning

• Structure: 貝類 is read as かいるい and is a biological category noun collectively covering shell-bearing shellfish or mollusks.
• Basic usage: Use 干潟で見られる貝類 for kinds found on tidal flats and 貝類を扱った調理器具 for utensils that handled them as food.

2. Common pitfalls and similar expressions

• Individual and category
  • 貝 can name a shellfish or shell, while the category-forming 類 makes 貝類 a collective class of kinds.
• Observation and food handling
  • A field guide is used to identify species in the habitat, whereas the kitchen context concerns cleaning utensils after handling shellfish.