Arthropods (PHYLUM)

Crustaceans (SUBPHYLUM)

Eumalacostraca (CLASS): Crabs, Shrimps, and Lobster -- Decopods


Habitat:  Among rocks, in tidepools, bays and estuaries, and on open rocky shores; from low-tide line to water 260' (79 m) deep.

Size: 6 1/4" (16 cm) wide, 4 1/4" (108 mm) long. Fan-shaped. Upper side brick-red

Food: carnivore: barnacles, bivalves, smaller living crabs and dead fishes.

Interesting Fact: Range from Alaska to Southern California.

 Red Rock Crab Other Sites:


Habitat: Exposed reef, sand, 0 - 820 m depth. Western Australia to North South Wales and around Tasmania.

Size: Carapace width to 125 mm

Food: Small marine invertebrates.

Interesting Fact: These crabs can be recognized by their orange color, massive size and legs. The species normally occurs in deep water but come into shallow in huge numbers to breed and feed.

Spider Crab Other Sites:


Habitat: Eastern seaboard of North America. These shrimps are carried by tides and wind driven into estuaries. Mostly found on shallow seafloors

Size: Female: 200 mm. Large males measure 182 mm. in length

Food: They feed on small animals and plants

Interesting Fact:

White Shrimp

Family: Penaeidae

Other Sites:

Habitat: Atlantic coast from North Carolina to Brazil.

Size: maximum 24", 18 pounds

Food: Mollusks and sea cucumbers.

Interesting Fact: It has up to 4 million babies.

Hannah: Amazing Animals of the World. Danbury, CT: Grolier, 1995.

Northern Lobster Other Sites:

Habitat: found in caves and crevices of rocky reefs

Size: largest spiny lobster weighed more than 26 pounds and was 3 feet long.

Food: worms, snails and mussels

Interesting Fact: An interesting physical characteristic that the Spiny lobster shares with all species of lobsters is that it sheds (molts) it shell up to 25 times in the first five years of life.

Green Spiny Lobster Other Sites:

Habitat: Alaska to Baja California, at depths from 60 to 4,800 feet (18-1,463 meters) 

Size: 15 mm (known as the smallest lobster in the world) but some species to 12 cm

Food: scavengers; they scoop up muddy or sandy deposits and sort out edible bits with their mouth parts

Interesting Fact: These animals look like lobsters, but they’re more closely related to hermit crabs. Squat lobsters’ arms can grow to be several times their body length.

Squat Lobster Other Sites:

Cirripedia: CLASS -- Barnacles

Habitat: Barnacles live on hard surfaces at all latitudes at all depths from the intertidal zone to the deep sea.

Size: Many coastal species are no larger than a few mm tall but some deep water species are 80 mm.

 Food: Plankton (filter feeders)

Interesting Fact: When barnacles are feeding you can see their jointed legs and hard exoskeletons.

Acorn Barnacles Other Sites:

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