invertebrate Flashcards
Porifera
are a basal animal clade as a sister of the diploblasts
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.
Platyhelminthes
a phylum of invertebrates that comprises the flatworms.
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.
Pinworms
a small nematode worm which is an internal parasite of vertebrates.
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.
Gastropods
a mollusk of the large class Gastropoda, such as a snail, slug, or whelk.
Coelomate
is the main body cavity in many animals and is positioned inside the body to surround and contain the digestive tract and other organs
Acoelomate
an invertebrate lacking a coelom
Bilateral Symmetry
the property of being divisible into symmetrical halves on either side of a unique plane.
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.
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.
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.
Gizzard
a muscular stomach of some fish, insects, mollusks, and other invertebrates.
Polyp
a projecting growth of tissue from a surface in the body, usually a mucous membrane
Crop
a thin-walled, expanded portion of the alimentary tract
Intestine
(in vertebrates) the lower part of the alimentary canal from the end of the stomach to the anus.
Pharynx
the part of the alimentary canal immediately behind the mouth in invertebrates.
Aortic arches
the section of the aorta between the ascending and descending aorta
