Last updated over 2 years ago
A small selection of marine invertebrates.
Like counting rings in the trunk of a tree, the age of corals can be determined by examining coral growth rings.
Horseshoe crabs have three main parts to the body: the head region, known as the 'prosoma', the abdominal region or 'opisthosoma' and the spine-like tail or 'telson'.
The shore crab feeds on invertebrates including worms, mollusks and crustaceans.
This enormous shellfish is the largest species of bivalve mollusk in the fossil record, and the heaviest of all the living mollusks.
The Purple Urchin has a round body that consists of a radially symmetrical test, or shell, covered with large spines.
The native oyster is a bivalve mollusc, which means 'two shells', and is rough, scaly and yellowish-grey in colour.
Barnacles are found more readily in tropical tidal zone marine environments, but may also thrive in cooler areas. These species attach to almost any roughened surface such as rocks, whales, piers, ship hulls and sea turtle shells.
The common starfish has 5 arms (although individuals may occasionally have just 4 or as many as 6).
Like anemones and corals, the moon jellyfish is a cnidarian, which means it has a sac-like body with a mouth and tentacles.
Although they may seem to be fixed to the rock, common limpets actually move around to graze on algae during moist conditions or when they are submerged by the tide. They return to the same spot by following the mucus trail that they deposit.
The marbled body of the whelk is encased in a calcified shell, which ranges from 6-10 cm in length. The body is composed of three basic parts: the foot, the head, and a visceral mass.
Despite the common name, hermit crabs are related more closely to lobsters than to crabs. They lack a hard exoskeleton, and adopt the empty shells of gastropod mollusks,carrying them around and swapping them for a larger shell as they grow.
A lobster's body is divided into twenty-one segments: six segments from the head region, eight segments compose the thorax (mid-section), and seven segments make up the abdomen (often called the tail).
The compass jellyfish is easy to recognize by the brown v-shaped markings found running from the center of the jellyfish down to the outer edge. This jellyfish has long stinging tentacles hanging from the rim.
Become part of the EOL community—sign up for the EOL Newsletter today
Become part of the EOL community!
Join EOL now
Already a member?
Visit the Biodiversity Heritage Library