Invertebrates Flashcards
(23 cards)
Vertebrates
An animal with a backbone.
Invertebrates
An animal that does not have a backbone.
Consumer
An organism that feeds on other animals in the food chain.
Ganglion
A mass of nerve cells.
Gut
The digestive track.
Coelom
A body cavity that contains the internal organs.
Bilateral Symmetry
Being divisible into symmetrical halves on each side.
Radial Symmetry
Symmetry around a central axis.
Asymmetry
Lack of equality on both halves.
Sponges
An aquatic invertebrate with a soft spongelike body.
Cnidarians
An aquatic invertebrate animal of the phylum Cnidaria.
Flatworms
A worm that includes the planarians together with parasitic flukes and tapeworms.
Roundworms
A nematode, especially a parasitic one found in intestines of mammals.
Mollusks
An invertebrate of a large phylum that includes slugs, snails, mussels, and octopusses.
Open circulatory system
A system in which the circulatory fluid is not contained entirely with vessels.
Annelid worms
also known as the ringed worms or segmented worms, are a large phylum, with over 17,000 extant species including ragworms,
Exoskeleton
rigid external covering for the body in some invertebrate animals, especially arthropods, providing both support and protection.
Compound eye
an eye consisting of an array of numerous small visual units, as found in insects and crustaceans.
Closed circulatory system
Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness.
Antenna
a pair of long, thin sensory appendages on the heads of insects, crustaceans, and some other arthropods
Metamorphosis
the process of transformation from an immature form to an adult form in two or more distinct stages.
Endoskeleton
an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.
Water vascular system
a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.
