Mollusks and Echinoderms. Mollusks and Echinoderms are In the Animal Kingdom / Kingdom Animalia: Echinoderms are a phylum of marine animals Mollusks are a phylum of invertebrate animals . Echinoderms/Echinodermata:. Brittle star. Invertebrates (no backbone)
They have an outer layer made of calcium carbonate (a chalky substance) and 5 or more arms radiating from the central body called a pentamerous. Sea Stars (otherwise known as Starfish) have sharp spines covering the body, and nerve cells that transport information throughout the body. They also have light sensors at the tip of each arm, and if any part of the sea star is cut off or falls of, it will grow back
Sea stars expel large numbers of sperm and eggs into the ocean. The fertilization is external, and after fertilization there are tiny, transparent larvae (baby sea stars). They get swept along by ocean currents for roughly 2 months, then slowly develop, and eat phytoplankton
Sea stars are carnivores, so they eat mussels, oysters, scallops, clams, coral, fish, and other types of animals. They push their stomachs out through their mouth on the underside of their body to digest the food.
Sea stars live in the ocean on coral reefs, rocks, and sand. They live in both cold and warm salty water, in every ocean.
The male octopus has a special arm called a hectocotylus used to transfer sperm into a females mantle cavity. The female lays the fertilized eggs in her den, and guards the eggs until they hatch, which could take from 30 days to a year, depending on the species. She may seal off the den with more rocks and will remain there until all the eggs have hatched. After the eggs have hatched, the female dies.
Octopuses have a large, bulbous head and large eyes. They have 8 distinctive arms with suction cups, and can weigh up to 400 pounds. If an arm is cut off, it will grow back. Something cool about them, is that they cannot hear.
Octopuses eat small crabs and scallops. They eat shrimp, fish, turtles, and sometimes other octopuses. They catch their prey with their arms and bite them, paralyzing the prey with a nerve poison. They hunt at night, and are carnivores.
They live in the ocean in coral reefs, on the ocean floor, and in tropical and temperate waters. They usually live in dens made of rocks especially when waiting for eggs to hatch.
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