Simple invertebrate Flashcards
(22 cards)
Referred to as sponges. Don’t have mouths, they have tiny pores in their outer walls.
Porifera
More complex than sponges. They have 2 main layers of cells that sandwich a middle layer of “jelly”. (radial symmetry)
Cnidaria
Referred to as segmented worms. (earth worms, leeches). Has 3 body regions; Head, Segments, Pygidium.
Annelida
A life stage for most animals in the class of hydrozoa. A hydrozoan polyp as distinguished from a hydrozoan jellyfish.
Hydroid
Jellyfish or sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a big part of the phylum Cnidaria.
Jellyfish
Flatworms; Platy meaning flat, helminth meaning worm (in greek). Unsegmented, soft body, invertebrates.
Platyhelminthes
Round worms, bilaterally symmetrical, worm like organisms surrounded by a strong flexible noncellular layer called a cuticle.
Nematoda
Also known as a thread worm (parasite), common intestinal parasite
Pinworms
Parasitic worm, in the flatworm phylum. They anchor themselves in the intestines. Have no mouth, absorb nutrients from the hosts gut.
Tapeworms
Aquatic mollusk that has a compressed body enclosed within a hinged shell, such as oysters, clams, mussels, and scallops.
Bivalves
Mollusk of the large class Gastropoda, (Ex; snail, slug, or whelk).
Gastropods
Have a fluid filled cavity between the body wall and the gut. The cavity is completely enclosed by mesoderm. (Ex; Molluscs, arthropods, chordates).
Coelomate
(“False cavity”), which is a fully functional body cavity. Tissue derived from mesoderm only partly lines the fluid filled body cavity of these animals. Digestive cavity is the only internal cavity.
Acoelomate
Symmetry around a central axis, (starfish or a tulip flower)
Radial symmetry
If the sides are different, that’s asymmetry. (Sponges)
Asymmetry
Being divisible into symmetrical halves on either side
Bilateral symmetry
Flexible limb or appendage in an animal, especially around the mouth of an invertebrate, used for grasping, moving about. (Octopus, Suction)
Tentacle
Produce & store sperm, are also the body’s main source of male hormones, such as testosterone. These hormones control the development of the reproductive organs and other male characteristics.
Teste
Explosive cell containing one giant secretory organelle or cnida. Used for prey capture and defense from predators.(corals, sea anemones, hydrae, jellyfish, etc.)
Cnidocyte
The outermost layer of cells or tissue of an embryo in early development, which include the epidermis (ecto-epid) and nerve tissue.
Ectoderm
The innermost layer of cells or tissue of an embryo in early development, which include the lining of the gut and associated structures.
Endoderm
A female reproductive organ in which ova or eggs are produced, present in humans and other vertebrates.
Ovary
