Flashcards in Chapter 18 Deck (66):
A characteristic that all animals have. Eating food.
A hollow ball of cells.
When the blastula folds inward
The internal sac formed by gastrulation
An outer cell layer that gives rise to the outer covering of the animal and, in some phyla, to the central nervous system.
A third embryonic cell layer which forms the muscles and most internal organs
An immature individual that looks different from the adult animal
A major change of body form that the larva undergoes in becoming an adult capable of reproducing sexually
Those animals that lack a vertebral column
A body plan where the body parts radiate fro the center like the spokes of a bicycle wheel.
A body plan that has a mirror-image right and left sides
part of bilateral symmetry that is the head end
part of bilateral symmetry that is the tail end
part of bilateral symmetry that has a back end
part of bilateral symmetry that is the bottom end
Fluid-filled space between the digestive tract and outer body wall that cushions the internal organs and enables them to grow and move independently of the body wall.
Provides a rigid structure against which muscles contract, moving the animal
A body cavity completely lined by tissue derived from mesoderm
A body cavity not completely lined by tissue derived from mesoderm
The first opening becomes the mouth
The first opening becomes the anus, and the second opening forms the mouth
The animals with true tissues. Every phyla except porifera.
Those phyla of animals that have bilateral symmetry
Inner flagellated "collar" cells of a sponge which help to sweep water through the sponge's body.
One of the layers of the sponge which produce supportive skeletal fibers composed of spongin and spicules
suspension feeders, filter feeder
Animals that collect food particles from water passed through some type of food-trapping equipment.
Anchored in place
A body form of cnidarians that has a cylindrical body with tentacles projecting from one end that is mostly stationary
A freely moving body form of cnidarians that are shaped like an umbrella with a fringe of tentacles around the lower edge
A cavity where food is digested. Fluid in the gastrovascular cavity circulates nutrients and oxygen to internal cells and removes metabolic wastes.
A group of flatworms that has a simple brain and move by using cilia
A group of flatworms that live as parasites in other animals and have complex lifecycles
A group of flatworms that are similar to flukes that inhabit the digestive tracts of vertebrates
Several layers of tough nonliving material that cover the body and prevent an organism from drying out.
complete digestive tract
A digestive tract where food travels only one way through the system and is processed as it moves along.
A part in molluscs that functions in locomotion
A part in molluscs that contains most of the internal organs
A fold of tissue in molluscs that drapes over the visceral mass and secretes a shell
A rasping organ in molluscs that is used to scrape up food.
An organ system that pumps blood and distributes nutrients and oxygen throughout the body.
A type of mollusc, includes the only type that can be found on land.
Molluscs that have shells divided into two halves that are hinged together.
Molluscs that are adapted to the lifestyle of fast, agile predators.
The subdivision of the body along its length into a series of repeated parts
open circulatory system
Blood is pumped through vessels that open into body cavities, where organs are bathed directly in blood.
closed circulatory system
Blood remains enclosed in vessels as it distributes nutrients and oxygen throughout the body. Only annelids and vertebrates have a closed circulatory system.
Annelids that are mostly marine. Many are tube-dwellers and extend feathery appendages to feed.
Annelids that are carnivores. Some suck blood.
Invertebrates with segmented, hard exoskeletons, and joint appendages
An external skeleton that protects the animal and provides points of attachment for the muscles that move the appendages
The process of periodically shedding an old exoskeleton and secreting a larger one
An arthropod that has survived with little change for hundreds of millions of years
An ancient group of arthropods that were abundant in the sea some 300 million years ago. Horseshoe crabs are part of this group.
A group of chelicerates that includes scorpions, spiders, ticks, and mites
Wormlike terrestrial creatures that eat decaying plan matter. They have two pairs of short legs per body segment.
Terrestrial carnivores with a pair of poison claws used in defense and to paralyze prey such as cockroaches and flies. Each of their body segments bears a single pair of long legs.
A group of arthropods that includes lobsters, crayfish, barnacles, crabs, and shrimp
The transition from larva to adult involves a pupa stage.
The transition from larva to adult involves multiple molts, but no pupa stage.
An internal skeleton in echinoderms
water vascular system
A network of water-filled canals in echinoderms that branch into extensions called tube feet.
A characteristic in vertebrates that is a flexible, supportive, longitudinal rod located between the digestive tract and the nerve cord
A characteristic in vertebrates that is located in the pharynx, the region just behind the mouth.
A tail posterior to the anus
A group of marine invertebrate chordates that feed on suspended particles