Modifiers matching gastropod:

• herbivorous,
• marine,
• large,
• terrestrial,
• small,
• intertidal,
• common,
• smaller,

Simple categories matching intertidal:

• invertebrate,
• arthropod,
• bivalve,
• organism,
• mollusk,
• shellfish,
• gastropod,
• structure,
• system,
• animal,
• creature,
• fauna,
• prey,
• herbivore,
• mollusc,
• snail,
• species,