The Large Splurchin is a large member of the Splurchin Family featured in Hey! Pikmin. It is a urchin-like creature with very large spikes all over its body. Despite the fact that it is named the Large Splurchin, it is currently the only known member of the Splurchin family.
Hey! Pikmin Log
"The S.S. Dolphin II says that this mindless, floating creature is delicious on the inside. It hasn't told me how to get past the spikes yet to try it."