Question

Arthropoda is the largest animal phylum.

It includes animals like crabs, spiders, lobsters, centipedes, insects, mites and millipedes.

About 84 percent of all known species of animals are members of this phylum.

Answer 1

Arthropods

Crabs, lobsters, shrimp,barnacles and many other animals belong to the phylum arthropods. In fact, 75% of all animals belong to the phylum arthropoda (which also includes spiders and insects).

All arthropods have a hard exoskeleton made of chiton, a type of protein. This shell provides protection for the animals, and gives support for the attachment of the arthropod's muscles. Although arthropods grow, their exoskeletons do not grow with them. So they must periodically shed, or "molt" their exoskeletons in favor of a new one. Arthropods ("arthro" meaning joint, and "pod" meaning leg) also have jointed appendages. Lost limbs can gradually be regenerated after successive moltings.

Amphipods

Amphipods have two types of legs: five pairs attached to the thorax are used for walking, and three pairs on the abdomen are used for swimming. The most common type of amphipods are the gammarids. You probably know them better as beach hoppers, side-swimmers, scuds, or sand fleas. Unlike real fleas, amphipods do not suck blood. Another type of amphipod, the skeleton shrimp, looks a lot like a praying mantis and hangs out on seaweeds,bryozoans, and hydroids.

Crabs

Crabs belong to the subphylum Crustacean, the largest group of marine arthropods, which also includes lobster, shrimp, and krill, a shrimp-like crustacean. Crabs move sideways, walking on four pairs of legs, and holding their two legs with claws away from their body. If you're feeling a bit fearless, you might attempt to pick up a crab to see if it's a male or female: Female crabs have a wide abdomen to hold eggs, while males have a thin, pencil shaped flap. Crab eggs hatch and mature in three stages: from egg to zoea larva to megalops larva to adult.

Most arthropods are scavengers, eating just about anything and everything that settles to the ocean floor. Skeleton shrimp feed detritus, algae or animals. Crabs feed onmollusks they crack with their powerful claws. Their biggest predators are gulls.

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