Clampy

Clampies (also known as Giant Clams or simply Clams ) are giant clam enemies that debuted in Super Mario Galaxy. They open and close their valves periodically, often revealing items inside their cavities. The player can collect these items and swim away before getting caught inside the Clampy as it closes its valves.

Super Mario Galaxy
One cream-colored Clampy first appears in Super Mario Galaxy, being encountered in the Beach Bowl Galaxy. Much like the clams in Super Mario 64, it holds treasures inside such as Star Chips and coins, depending on the mission selected.

New Super Mario Bros. Wii
Clampies make their first 2D game appearance in New Super Mario Bros. Wii, only appearing in World 1-4 and in a secret area in World 4-1. They were slightly reshaped, and now display a purple coloration with darker wavy stripes, which would stick to them in most future appearances. They have coins or 1-Up Mushrooms between their valves in order to lure a character close so they can attack them. If a Clampy closes its shell in on a character, it will trap them inside for a brief moment and damage them before opening back up. However, their top shells (when closed) and the inside of their cavities (when open) are safe to tread on. In general, Clampies spawn in mid-water and slowly sink to a ground underneath, after which they begin their routine of opening and closing their valves. One Clampy in World 1-4 slips into a pit after touching the ground.

Super Mario Galaxy 2
A single Clam appears in Super Mario Galaxy 2, behaving and looking identically to the species' initial appearance in Super Mario Galaxy. It appears on the seabed in Starshine Beach Galaxy.

New Super Mario Bros. U
Giant Clams also appear in New Super Mario Bros. U where they act exactly like they do in New Super Mario Bros. Wii. One can be found in a secret area of Waterspout Beach, while multiple inhabit.

Mario Kart 7
Clampies appear in the Cheep Cheep Lagoon and Daisy Cruiser racecourses in Mario Kart 7. They are obstacles that are found only underwater, containing coins and Item Boxes between their valves that racers can pick up, taking care not to be trapped by the Clampy's valves. Racers can perform tricks on them when they are open.

Mario Kart Tour
Clampies reappear in 3DS Cheep Cheep Lagoon in Mario Kart Tour, acting the same as they did in Mario Kart 7. They are able to spin out drivers in a Bubble without popping their Bubble. The Item Boxes that Clampies produce, if broken, do not respawn immediately unlike other Item Boxes.

Mario Party 10
Clampies reappear in Mario Party 10 in the background of the board Whimsical Waters. They also appear in the minigame Cheep Cheep Check, where they are used by the solo player to disperse large clusters of bubbles meant to distract the other players from counting the Cheep Cheeps.

Dr. Mario World
A Clampy appears as an Assistant in Dr. Mario World. When equipped in stage mode, there is a chance that the rainbow meter is filled by three sections when the stage starts. In versus mode, it grants doctors an extra chance to defend against opponent's attacks.

New Super Mario Bros. Wii
Card Number: 34 (Normal), F19 (Silver)
 * Trading Card description: It looks like an open and shut case with this enemy. Clampy lurks in the depths of the sea, patiently waiting to make a move. Clampy will try to clench you in its shell, causing a loss of power—or worse! However, sometimes there a 1-Up mushroom in them, so it may be worth messing with this mollusk. Don't clam up—swim fast, grab the goods, and get out!

Dr. Mario World

 * Stage mode: Grants 50%/60%/70%/80%/100% chance rainbow meter sections (3) will be filled on stage start.
 * Stage mode (Prior to version 2.3.0): Grants 10%/20%/30%/40%/50% chance rainbow meter sections (3) will be filled on stage start.
 * Versus mode: Increases chance to defend by 2%/4%/6%/8%/10%.