Vocab. for Invertebrates
Terms
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- Invertebrates
- Animals that lack a backbone
- Vertebrates
- Animals that possesses a backbone
- Spherical symmetry
- If it can be cut into two identical halves by any cut that runs through the organism's center.
- Radial symmetry
- An organism possesses radial symmetry if it can be cut into two identical halves by any longitudinal cut through its center.
- Bilateral symmetry
- If it can only be cut into two identical halves by a single longitudinal cut along its center which divides it into right and left halves.
- Epidermis
- outer layer of cells designed to provide protection
- Mesenchyme
- the jelly like substance that separates the epidermis from the inner cells in a sponge
- Collar cells
- flagellated cells that pump water into a sponge
- Amebocytes
- cells in a sponge that perform digestion and transport functions
- Polyp
- a sessile, tubular chidarian with a mouth and tentacles at one end a basal disk at the other.
- Medusa
- a free-swimming cnidarian with a bell shaped body and tentacles
- Epithelium
- animal tissue consisting of one or more layers of cells that have only one free surface, because the otehr surface adheres to a membrane or other substance
- Mesoglea
- jelly-like substance that separates the epitelial cells in a cnidarian
- Nematocysts
- small sapsules that contain a toxin which is injected into prey or predators
- Testes
- the organ that produces sperm
- ovaries
- organ that produces eggs
- anterior end
- the end of an animal that contains its head
- posterior end
- the end of an animal that contains the tail
- circulatory system
- a system designed to transport food and other necessary substances throughout a creatures body
- nervous system
- a system of sensitive cells that respond to stimuli such as sound, touch, and taste
- Ganglia
- masses of nerve cell bodies
- Hermaphroditic
- possessing both the male and the female reproductive organs
- regeneration
- the ability to re-grow a missing part of the body
- mantle
- a sheath of tissue that encloses the vital organs of a mollusk, makes the mollusk's shell, and performs respiration
- shell
- a tough, multi-layered structure secreted by the mantle. It is usually used for protection, but sometimes for body support
- visceral hump
- a hump that contains a mollusks heart, digestive, and excretory organs
- foot
- a muscular organ that is used for locomotion and takes a variety of forms depending on the animal
- radula
- a organ covered with teeth that mollusks use to scrape foodinto their mouths
- univalve
- an organism with a single shell
- bivalve
- an organism with two shells