Modifiers matching gastropod:

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

Simple categories matching intertidal:

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