Invertebrate Flashcards
Porifera
sponges, and/or These are multicellular organisms which are sessile/sedentary in nature. Most of them are marine while a few are fresh water forms. Body is cylindrical, asymmetrical or has radial symmetry.
Cnidaria
The phylum includes jellyfish, sea anemone and coral. Characterized by a digestive cavity that forms the main body, they may have been the first animal group to reach the tissue level of organization. Cnidarians are radially symmetrical, jelly-like and have a nerve net and one body opening.
Annelida
also known as the ringed worms or segmented worms, are a large phylum
Hydroid
are a life stage for most animals of the class Hydrozoa, small predators related to jellyfish. Some hydroids such as the freshwater Hydra are solitary, with the polyp attached directly to the substrate. When these produce buds, they become detached and grow on as new individuals
Jellyfish
Because their body is 95% water, which means they are perfectly camouflaged. The body of a jellyfish is divided into three main parts, the umbrella, the oral arms (around the mouth) and the stinging tentacles. They are animals with radial symmetry.
Platyhelminthes
a group of soft-bodied, usually much flattened invertebrates
Nematoda
a worm of the large phylum Nematoda, such as a roundworm or threadworm.
Pinworms
are small parasites that can live in the colon and rectum. You get them when you swallow their eggs. The eggs hatch inside your intestines. While you sleep, the female pinworms leave the intestines through the anus and lay eggs on nearby skin
Tapeworms
a parasitic flatworm, the adult of which lives in the intestine of humans and other vertebrates. It has a long ribbonlike 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
have a body cavity called a coelom with a complete lining called peritoneum derived from mesoderm
Acoelomate
an invertebrate lacking a coelom especially, one belonging to the group comprising the flatworms and nemerteans and characterized by bilateral symmetry and a digestive cavity that is the only internal cavity
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
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, moving about, or bearing sense organs
Cnidocyte
is an explosive cell containing one giant secretory organelle or cnida that defines the phylum Cnidaria. Cnidae are used for prey capture and defense from predators. Despite being morphologically simple, lacking a skeleton and many species being sessile, cnidarians prey on fish and crustaceans
Ectoderm
the outermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the epidermis and nerve tissue
Endoderm
the innermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the lining of the gut and associated structures
Ovary
a female reproductive organ in which ova or eggs are produced, present in humans and other vertebrates as a pair
Teste
The male sex gland, located behind the penis in a pouch of skin called the scrotum. The testes produce and store sperm and are also the body’s main source of male hormones, such as testosterone
