1. BIVALVIA
http://en.wikipedia.org/wiki/
Scallops and Oysters
Creatures of the Ocean
Scallops and oysters are part of the class, Responses to Stimuli General Structure
Bivalvia. There are many interesting Scallops and oysters have many defensive Scallops and oysters have bodies that are
characteristics about them. In the next mechanisms. They can detect danger Dlattened from side to side and
few paragraphs, I will be explaining the because they have light‐sensitive cells completely surrounded by two shells
characteristics of oysters and scallops. that can detect shadows that fall over called valves. There is a hinge on the back
External Transport them. of the two shells that holds them
Scallops and oysters move around very Adaptations together. Powerful muscles contract
well. They move by clapping their valves Some scallops and oysters stay in ligaments to keep the valves closed and
together to make a jet of water that colonies for most of their lives, but some relax them to open them. The valves are
propels them forward. others have a foot that enables them to usually the same size, shape, color, and
Internal Transport move around and burry themselves in the texture.
Their internal circulation is an open sand. Place in Food Chain
circulatory system that surrounds the Nutrition Scallops and oysters are at the bottom of
organs and cells in hemolymph. Their Most scallops and oysters are Dilter the food chain. They are mostly eaten by
heart has three chambers; two auricles feeders. They mostly feed on planktonic creatures in the ocean like starDish, eels,
receiving blood from the gills, and a food and other plants and animals snails, Dish, octopuses, and seals. They
single ventricle. The ventricle is muscular Dloating on the surface of the water. usually eat tiny creatures like plankton
and pumps hemolymph into the aorta, Respiration and bacteria.
and through this to the rest of the body. Scallops and oysters obtain oxygen Background of Group
Many bivalves have only one single aorta, through gills. However, some species have Scallops and oysters Dirst appeared in the
but most also have a second, usually no gills. Their mantle cavity is the only Ordovician, the second of six periods in
smaller, aorta going to the hind parts of location for the gas exchange. the Palaeozoic Era. They are found in
their body. Regulation both salt and fresh water.
Reproduction Scallop’s and oyster’s regulation is Clam, Zebra Mussel, and the Japanese
Scallops and oysters reproduce by dependent on what the environment’s Oyster.
external fertilization, which is a form of surrounding temperature is. They need
fertilization in which the egg is external fairly warm water to survive. If it is too
to the reproducing individual. cold, they will freeze.
1

2. BIVALVIA
http://en.wikipedia.org/wiki/File:Coques.jpg
Scallops and Oysters
Creatures of the Ocean
Other Organisms in the Class Endangered Species largest bivalves in the world. They can
Mussels and clams are other Three endangered species from the weigh more than 500 pounds.
organisms found in this class. Some class, Bivalvia, are the tan rifDle‐shell,
species from the class, Bivalvia, are the the Freshwater Pearl Mussel, and the Resources
Eastern Oyster, Atlantic Bay Scallop, Oyster Mussel. http://en.wikipedia.org/wiki/Bivalvia
Northern Quahog Clam, Zebra Mussel, Importance to our Lives
http://animals.jrank.org/pages/1908/
and the Japanese Oyster. Scallops and oysters are valued as
Bivalves-Bivalvia.html
“Oddball” food sources. Throughout history their
The oddball in my group are the shells have been used for buttons. http://animals.jrank.org/pages/1899/
scallops. They are an oddball because Their shell fragments have been used Bivalves-Bivalvia-PHYSICAL-
they are the only bivalves capable of for everything from roads to fertilizer, CHARACTERISTICS.html
jet‐propelled swimming and that their and the pearls in oysters have always
http://www.encyclopedia.com/doc/1O8-
eyes are well developed. They are still been treasured. Scallop shells are also Pteriomorphia.html
classiDied here because they have two used for plates and decorative pieces.
valves that are associated with all Other Interesting Facts
other bivalves. Some interesting facts about scallops By: Taylor Phillips Pd. 5
Type of Symmetry and oysters are that female oysters
Scallops and oysters have bilateral can produce as many as 500 million
symmetry. That means that each side eggs in a year and all bivalves make
of the bivalves are almost identical to pearls. Also, giant clams are the
each other.