Invertebrate Flashcards
Invertebrate
Animals without backbones.
Exoskeleton
Hard or tough outer coverings that provide a framework of support.
Endoskeleton
Internal skeleton.
Vertebrate
Endoskeleton and backbone.
Hermaphrodites
Produce eggs and sperm at in the same animal body.
Zygote
Sperm penetrates the egg to form a fertilized egg cell.
Internal Fertilization
Sperm and egg combine inside the animal’s body.
External Fertilization
Egg and sperm combine outside the animal’s body.
Radial Symmetry
Can be divided along any plane, through a central axis, into roughly equal halves.
Bilateral Symmetry
Means the animal can be divided into mirror image halves only along one plane through the central axis.
Coelom
Fluid-filled cavity. Has tissue formed from mesoderm that lines and encloses the organs.
Pseudocoelom
Fluid-filled body cavity that develops between mesoderm and the endoderm rather than developing entirely within the mesoderm as in colemates.
Acoelomates
Animals that do not have a coelom.
Protostomes
Mouth develops from the first opening in the gastrula. (mouth)
Deuterostomes
The anus develops from the first opening in the gastrula. (butt)
Sessile
Attached to and stay in one place.
Cnidocytes
Contain nematocysts.
Ganglion
Group of nerve cell bodies that coordinates incoming and outgoing nerve signals.
Regeneration
Process in which body parts that are missing due to damage or predation can be regrown.
Hydrostatic skeletion
Fluid within a closed space that provides rigid support for muscles to work against.
Trichinosis
Contracted by eating raw or undercooked pork and pork products, or wild game infected with the larvae of Trichinella.
Open circulatory system
Which the blood is pumped out of vessels into open spaces surrounding the body organs.
Close circulatory System
Blood is confined to vessels as it moves through the body
Crop
Where food is stored until it is passed to the gizzard.
Gizzard
Muscular sac containing hard particles that help grind soil and food before they pass into the intestine.
Clitellum
Thickened band of segments
Thorax
Middle body region, consisting of three fused main segments to which in many arthropods the legs and wings are attached.
Abdomen
Contains fused segments and is at the posterior end of the arthropod bears additional legs and contains digestive structures and the reproductive organs.
Cephalothorax
Thorax region fused with the head into a single structure.
Molting
Shedding the exoskeleton.
Mandibles
Mouthparts of most arthropods including a pair of appendages.
Tracheal tubes
Most terrestrial arthropods have this system of branching tubes.
Book Lungs
Saclike pockets with highly folded walls for respiration.
Malpighiam Tubules
Cellular waste removed from the blood through these tubes. These tubules also help terrestrial arthropods preserve water in their bodies to maintain homeostatic water balance.
Spiracles
Both tracheae and book lungs open to the outside of the body of the arthropod in these openings.
