Characteristics Of Mollusca
It is good to know the characteristics of mollusca and why this beautiful creature is one of the habitants not only in the aquatic but also in the terrestrial regions of earth. The characteristics of mollusca can be complex and knowing there are more than 10 thousand species known to us nature allowed that we co-exist with them harmoniously. In both in marine and land these creatures are important to mankind for the best interest of ecology. Before we learn more on the characteristics of mollusca let us consider that they are beautiful and has established a great connection to mankind in terms of beauty- when used for decoration, edibility- used as food, and the shell and pearl industry made other people rich.
One of the characteristics of mollusca is having a soft body and is protected by a hard shell that is bilaterally symmetrical. The body is comprised of cell layers of tissues and organs with flexible body wall and comes in different shapes and sizes that cover these internal organs. Mollusca can; survive without eating and what goes in must come out. One of the characteristics of mollusca is that it has a complex digestive tract. The foregut region consists of an esophagus and passing the food to the toothed belted radula to scrape food. Their stomachs are also complex and are different in each molluscan species.
The mollusks that belong to the diverse phylum found in the aquatic regions are the most successful among all of the species. Those other species that lived in most environments other than aquatic are far less fortunate than those oceanic inhabitants.
When it comes to breathing characteristics of mollusca , aquatic mollusca breathe through gills (ctenidia) that is located between the mantle and the body wall. However those mollusks living in the terrestrial region don’t have ctenidia and they have lungs that can function in both water and air. They excrete wastes through the gills and the anus as well. Slugs, worms, and other animals with no backbones are called invertebrate animals and since the mollusks belong to the same classification, they rely mostly on the mass on their muscles without requiring a lever action in order to move. It does not mean that they are soft bodied, and they can be weak. That is why the unique characteristics of mollusks are their powerful molluscan muscle to keep up with their movements and posture.
Other characteristics of mollusca include having a nervous system, gaseous exchange organs (they breathe in oxygen and gives out Carbon dioxide), they have a pair of kidney and the reproduction of mollusca is normally sexual and maybe complex. Because they have different classes and lived in different environment they feed their body differently. The characteristics of mollusca are well explained in the science books and encyclopedias and other biological reference books used in schools. As human being we co-exist with them in this world and in this environment we lived in.