invertabrates Flashcards
Porifera
a phylum of aquatic invertebrate animals that comprises the sponges.
Cnidaria
a phylum of aquatic invertebrate animals that comprises the coelenterates.
Annelida
a large phylum that comprises the segmented worms, which include earthworms, lugworms, and leeches.
Hydra
a minute freshwater coelenterate with a tubular body and a ring of tentacles around the mouth.
Jellyfish
a free-swimming marine coelenterate with a gelatinous bell- or saucer-shaped body that is typically transparent and has stinging tentacles around the edge.
Nematoda
a large phylum of worms with slender, unsegmented, cylindrical bodies, including the roundworms, threadworms, and eelworms. They are found abundantly in soil and water, and many are parasites.
Platyhelminthes
a phylum of invertebrates that comprises the flatworms.
Pinworms
a small nematode worm which is an internal parasite of vertebrates.
Gastropods
a mollusk of the large class Gastropoda, such as a snail, slug, or whelk.
Tapeworms
a parasitic flatworm, the adult of which lives in the intestines. It has a long ribbon-like body with many segments that can become independent, and a small head bearing hooks and suckers.
Bivalves
an aquatic mollusk that has a compressed body enclosed within a hinged shell, such as oysters, clams, mussels, and scallops.
Coelomate
body cavity in which well-developed organs can be accommodated
Acoelomate
any animal without a body cavity, such as a flatworm
Radial Symmetry
symmetry around a central axis, as in a starfish or a tulip flower.
Asymmetry
lack of equality or equivalence between parts or aspects of something; lack of symmetry.
Tentacle
a slender, flexible limb or appendage in an animal, especially around the mouth of an invertebrate, used for grasping or moving about, or bearing sense organs.
Bilateral Symmetry
symmetry in which similar anatomical parts are arranged on opposite sides of a median axis so that one and only one plane can divide the individual into essentially identical halves.
Medusa
a free-swimming sexual form of a coelenterate such as a jellyfish, typically having an umbrella-shaped body with stinging tentacles around the edge. In some species, medusae are a phase in the life cycle which alternates with a polypoid phase.
Polyp
a solitary or colonial sedentary form of a coelenterate such as a sea anemone, typically having a columnar body with the mouth uppermost surrounded by a ring of tentacles. In some species, polyps are a phase in the life cycle which alternates with a medusoid phase.
Gizzard
The gizzard, also referred to as the ventriculus, gastric mill, and gigerium, is an organ found in the digestive tract of some animals
Crop
a cultivated plant that is grown as food, especially a grain, fruit, or vegetable.
Intestine
the lower part of the alimentary canal from the end of the stomach to the anus.
“the contents of the intestine”
Pharynx
the membrane-lined cavity behind the nose and mouth, connecting them to the esophagus.
Aortic arches
segment of the aorta that helps distribute blood to the head and upper extremities via the brachiocephalic trunk, the left common carotid, and the left subclavian artery.
