Sea-Land creature: Squolcraphin

I was thinking about a new creature that could work for almost every type of lake/pond/sea/oasis. Here's what I came up with:

Squolcraphin.

This creature is a part crab, part squid, part dolphin.

It has the face of a dolphin and the appendages of both the squid and a crab.

It acts the same way as a Dolphin would when attacked, with increased range because of its crab-arms. It is just as fast as the squid in the water, and is terrifyingly fast on land with its crab-legs when chasing you, but isn't fast when just walking around.

Spawning conditions are specific; It will only spawn in beach biomes, or lakes/ponds/oases, and only at sunset. They can be bred using any type of raw fish, or with seagrass.

They have a little more HP than dolphins, and when killed by a player they have a chance to drop one of the following items:

1. Crab arm. A weapon you can throw deal 3 attack damage. it is thrown much faster than a trident, but once you've thrown it it will be gone forever. Common item.

2. Food source. Common item.

3. Squolcraphin limb. Used to brew a boost potion, which gives the user speed 15 for 2 or 3 seconds.