3rd quarter zoology Flashcards
____ are underwater invertebrates with no head, arms or legs.
• They atach themselves to plants or rocks and stay in one place.
• Their body is covered with pores.
sponges
their skeleton type allow them to live in either hard or soft sediments their pores allow them to filter the water around them for food
phylum porifera
have a saclike body called “coelenteron.” They
have a single opening or mouth for food and waste.
They have a tree-like or a fan-like appearance.
phylum cnidaria and phylum hydrozoa
These are worms having a flat body.
phylum Platyhelminthes
These are worms having a round, threadlike body.
PHYLUM NEMATHELMINTHES
These are worms with segmented body.
PHYLUM ANNELIDA
These are microscopic aquatic animals with a crown of cilia or short hair on their head which they use to catch food.
PHYLUM ROTIFERA
are covered with exoskeleton that
must be shed or molt as they grow. They have a segmented body and jointed appendages.
arthropods
these are animals with a flattened body divided into segments and each of which has 1pair of legs
CLASS CHILOPODA
These are animals wich a cylindrical body divided into segments and each of which has 2 pairs of legs.
diplopoda
These are animals with a body divided into head, thorax and abdomen and have six legs.
CLASS INSECTA
These are animals with a head fused with the thorax and have eight legs.
CLASS ARACHNIDA
have a soft body that are usually protected
by a hard shell. Some do not have heads or shells.
mollusk
They are “belly-footed” and move by contraction.
• From the Greek words “gaster” which means belly and “podos” which means foot.
• Shelled ______ are called “univalves” because they have one shell typically coiled or spiraled.
Gastropoda and gastropods
They are called “bivalves”
Their shells are made of 2 valves.
CLASS PELECYPODA
They have a distinct head and several arms or tentacles around their mouth.
• Their tentacles are full of suckers, used to hold their prey.
CLASS CEPHALOPODA
They are also called “Sea Stars.”
They have thick, triangular arms connected to the central body.
CLASS ASTEROIDEA
echinoderns have an endoskeleton and
spines all over the body.
PHYLUM ECHINODERMATA
They are also called “Serpent Stars”
• They have much thinner and snake-like arms which are very movable.
CLASS OPHIUROIDEA
Their appearance resembles exotic plants.
CLASS CRINOIDEA
They have a spherical body with no arms.
CLASS ECHINOIDEA
Their body is soft and elongated.
• They are found on the sea floor worldwide.
CLASS HOLOTHUROIDEA
