Do molluscs have radial symmetry?
These creatures are radially symmetrical, meaning all their appendages emanate outward from a central point. Most mollusks, on the other hand, exhibit bilateral symmetry.
Do mollusks have bilateral symmetry?
Mollusks are generally considered a phylum of bilaterally symmetrical animals, although there are also many asymmetrical species. Bilateral symmetry means that an organism can only be divided into two equal halves if it is cut from top to bottom along the middle of the anterior-posterior (front-back) axis.
What type of symmetry to most molluscs show?
bilateral symmetry
Do mollusks have an endoskeleton or exoskeleton?
Unlike the internal skeleton of humans, mollusks actually have an external skeleton. This exoskeleton protects the animal’s soft inner body parts and acts as a sight for muscle attachment.
Is a turtle a mollusk?
Mollusks are not members of the insect family, but many people think they are. A mollusk may or may not have a shell. This is not how you distinguish a mollusk; other animals have shells such as turtles. Nevertheless mollusks are often considered pesks, and are hunted in gardens and by small children.
Do mollusks have Endoskeleton?
Mollusks have neither endoskeletons nor exoskeletons.
Is a Butterfly a hydrostatic skeleton?
Like almost all insects, butterflies are protected by an external skeleton. Unlike humans, whose bones are beneath soft tissues forming an endoskeleton, the soft tissue of butterflies is encased in a hard shell called an exoskeleton.
Do humans have hydrostatic skeleton?
Humans use hydrostatic fluid to support their tongue movement, starfish use hydrostatic support to move their hundreds of fluid filled tube-feet, squid and octopus us hydrostatic support to move their arms and legs, and many vertebrates like turtles and elephants have hydraulic/hydrostatic penises (spring loaded fluid …
Do echinoderms have hydrostatic skeleton?
Hydrostatic skeletons have a role in the locomotion of echinoderms (starfish and sea urchins), cnidarians(jellyfish), annelids (earthworms), nematodes, and other invertebrates. Despite this, they still possess a hydrostatic skeleton.
Do worms have a skeleton?
Earthworms do not have an internal skeleton as we do, and they do not have a protective hard exoskeleton as does an insect. They are flexible, long bundles of muscle, especially designed for life underground.
What animal has exoskeleton?
Examples of animals with exoskeletons include insects such as grasshoppers and cockroaches, and crustaceans such as crabs and lobsters, as well as the shells of certain sponges and the various groups of shelled molluscs, including those of snails, clams, tusk shells, chitons and nautilus.
Do ants have an exoskeleton?
Like all insects, an ant’s body is divided into three main parts: the head, the thorax, and the abdomen. Ants have a hard, waterproof exoskeleton, which is made of a material called chitin.
Which body part do ants have but we lack?
While they lack a proper heart, they do have a pumping organ called a dorsal aorta that pumps blood towards the head, achieving a small current. Unlike blood, hemolymph does not carry oxygen; so, ants – and all other insects – lack lungs entirely.