simple invertebrate Flashcards
primitive invertebrate animals comprising the sponges and having a cellular grade
porifera
phylum of more or less radially symmetrical invertebrate animals that lack a true body cavity, possess tentacles studded with nematocysts, and include the hydroids, jellyfishes, sea anemones, and corals.
cnidaria
also known as the ringed worms or segmented worms, are a large phylum
annelida
also known as the ringed worms or segmented worms, are a large phylum
hydriod
free-swimming marine coelenterate with a jellylike bell- or saucer-shaped body that is typically transparent and has stinging tentacles around the edge.
jellyfish
phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
platyhelminthes
having a tough outer cuticle. The group includes free-living forms and disease-causing parasites,
nematoda
small nematoid worm that inhabits the rectum of the human host.
pinworms
bothria that aid in attaching to their host, as well as a thin, long strobila body resembling a strip of tape or ribbon.
tapeworms
shell consisting of two halves hinged together
bivalves
usually with a univalve shell or none and a distinct head bearing sensory organs.
gastropods
univalve shell or none and a distinct head bearing sensory organs.
coelomate
invertebrate lacking a coelom especially
acoelomate
rrangement of parts of an organism around a single main axis, so that the organism can be divided into similar halves
radial symmetry
lack or absence of symmetry
asymmetry
balanced distribution of duplicate body parts or shapes within the body of an organism.
bilateral symmetry
unjointed part extending from the body of certain animals, such as an octopus, jellyfish, or sea anemone.
tentacle
explosive cell containing one giant secretory organelle or cnida
cindocyte
one of the three primary germ layers in the very early embryo
ectoderm
e innermost of the primary germ layers of an animal embryo.
endoderm
female gonad or reproductive gland, in which the ova and the hormones that regulate female secondary sex characteristics develop.
ovary
produce and store sperm and are also the body’s main source of male hormones, such as testosterone
teste
