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The Atlantic horseshoe crab (Limulus polyphemus) is a species of marine and brackish chelicerate arthropod. Despite their name, horseshoe crabs are more closely related to spiders, ticks, and scorpions than to crabs.

he greater blue-ringed octopus (Hapalochlaena lunulata) is one of four species of highly venomous blue-ringed octopuses. The greater blue-ringed octopus is capable of inflicting a deadly bite to its predators that can even be fatal to humans.

The chambered nautilus, Nautilus pompilius, also called the pearly nautilus, is the best-known species of nautilus.

The Chocolate Chip Sea Star (Protoreaster nodosus) is a species of sea star found in the warm, shallow waters of the Indo-Pacific region.

The Christmas Island red crab (Gecarcoidea natalis) is a species of land crab that is endemic to Christmas Island. Christmas Island red crabs are well known for their annual mass migration to the sea to lay their eggs in the ocean.

Chromodoris annae is a species of sea slug, a very colourful nudibranch. They can reach a maximum size of 5 cm length.

The colossal squid (Mesonychoteuthis hamiltoni) is believed to be the largest squid species in terms of mass. It is known from only a few specimens, and current estimates put its maximum size at 12–14 m (39–46 ft) long and weighing possibly up to 750 kilograms (1,650 lb).

Nembrotha kubaryana, also known as the variable neon slug or the dusky nembrotha, is a species of colorful sea slug. This animal can reach a total length of more than 120 mm.

Metasepia pfefferi, also known as the flamboyant cuttlefish, is a species of cuttlefish occurring in tropical Indo-Pacific waters off northern Australia.

Opisthoteuthis californiana, also known as the flapjack octopus, is a species of umbrella octopus.

Hymenocera picta, commonly known as the harlequin shrimp, is a species of saltwater shrimp found at coral reefs in the tropical Indian and Pacific oceans.

The Pacific sea nettle (Chrysaora fuscescens) is common in the eastern Pacific Ocean from Canada to Mexico. Sea nettles have a distinctive golden-brown bell with a reddish tint. The bell can grow to be larger than one meter (three feet) in diameter in the wild, though most are less than 50 cm across. The long, spiraling, white oral arms and the 24 undulating maroon tentacles may trail behind as far as 15 feet. For humans, its sting is often irritating, but rarely dangerous.

Flabellinopsis iodinea (Spanish shawl) is a species of aeolid nudibranch, a very colorful sea slug.