The phylum Mollusca compared to the phyla Porifera, Cnidaria, and Annelida.
Mollusca (squid) are soft bodied, have an organ system, and body symmetry. The have advanced cephalization, very well developed brain and eyes. Mollusca have a closed circulatory system, containing 3 hearts. It's nervous system controls part of the jet propulsion system. They also do not have a skeleton. Porifera have a skeleton, made out of lime and silicon. Cnidaria (jellyfish) have no bones, exoskeleton, or shell. Annelida have a hydrostatic skeleton.
Groups of Mollusks:
Gastropods are shell-less or single-shelled mollusks that move by using a muscular foot located on the ventral side. Cephalopods are typically soft-bodied mollusks in which the head is attached to a single foot. The foot is divided into tentacles or arms.
Ecology:
Mollusks play many different roles in living systems. For example, they feed on plants, prey on animals, and "clean up" their surroundings by filtering algae out of the water or by eating detritus. Mollusks are an important source of food for many organisms.
Mollusca (squid) are soft bodied, have an organ system, and body symmetry. The have advanced cephalization, very well developed brain and eyes. Mollusca have a closed circulatory system, containing 3 hearts. It's nervous system controls part of the jet propulsion system. They also do not have a skeleton. Porifera have a skeleton, made out of lime and silicon. Cnidaria (jellyfish) have no bones, exoskeleton, or shell. Annelida have a hydrostatic skeleton.
Groups of Mollusks:
Gastropods are shell-less or single-shelled mollusks that move by using a muscular foot located on the ventral side. Cephalopods are typically soft-bodied mollusks in which the head is attached to a single foot. The foot is divided into tentacles or arms.
Ecology:
Mollusks play many different roles in living systems. For example, they feed on plants, prey on animals, and "clean up" their surroundings by filtering algae out of the water or by eating detritus. Mollusks are an important source of food for many organisms.