From the Super Mario Wiki
A Preying Mantas is a Jellyfish found underwater in Super Mario World 2: Yoshi's Island and its remake Yoshi's Island: Super Mario Advance 3. Their name is a pun on praying mantis, which is a kind of insect, and manta ray, a kind of stingray, while enemy itself is designed after jellyfish. Preying Mantas move up and down in a small area, and therefore do not pose much of a threat to the Yoshis. The Yoshis can simply defeat them by shooting a torpedo at them in their Submarine forms. They appear again as enemies in Yoshi's New Island.
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