Octopus and clams are mollusks. Octopus has no external protection and eight extremities. Bivalves have shells and no extremities. Lobsters are crustaceans.
What are clams?
Clams are mollusks used worldwide as a source of food.
These animals are widely distributed all around the world and live buried in the sand near the sea coasts. They are sedentary animals.
They are bivalves. They protect their bodies with two symmetric calcareous structures known as valves. These are the shells and vary in shape and size according to the species. Their body is soft and plane.
They feed by filtration on organic particles suspended in the water. They can show external reproduction.
What are lobsters?
Lobsters are worldwide distributed crustaceans.
They live in rocky substrate, not far away from the surface.
They body is divided into three segmented parts:
- the cephalotorax that is composed of 13 segments and that carries two pairs of antenae.
- the abdomen that is composed of 6 segments.
- the telson that is not segmented.
Their apendixes emerge from the abdomen and cephalotorax. They use them to move, to sence the environment, and to feed.
Their body is protected by a hard quitin exoskeleton.
They are omnivorous animals.
What are cephalopods?
These animals are marine mollusks, mostly inhabiting warm and template waters.
Their bodies are soft and not protected by any hard structure. Their shell remains in the interior of their bodies in some groups or has completely disappeared in other groups.
They have a big head from where eight extremities emerge. These extremities are tentacles and are used to move, defend themselves, and feed.
These are carnivorous animals. And they reproduce by laying eggs.
A- Lobster ⇒ crustaceans, which have segmented bodies and limbs
with joints.
B. Clams ⇒ mollusks, which live in hard shells and have no limbs.
C. Octopus ⇒ cephalopods, which have a shell inside their bodies,
and they move with tentacles.
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