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Terms in this set (33)
ItIt is a hypothesis formulated to explain the origin of multicellularity from protists ancestors. Animals may have been derived when protists associated and cells became specialized and interdependent
It is the idea that multicellular organisms could have arisen from by the formation of plasma membranes within a large group of multinucleate protist
It is a thin, flat cell covering the outer surface, and some of the inner surface, of poriferans
It is tubular cells in a sponge body wall that create a water channel to an interior chamber
It is a jelly like layer between the outer(pinacocyte) and inner (choanocyte) layers of a sponge. It contain wandering amoeboid cells
They are Amoeboid cells that move about in the mesohyl and are specialized for reproduction, secreting skeletal elements, transporting and storing food, and forming contractile rings around openings in the cell wall
They are cells of sponges that create water currents and filter food
They are Skeletal elements that some mesenchyme cells of a sponge body wall secrete. May be made of calcium carbonate or silica
It is a fibrous protein that makes up the supportive framework of some sponges
It is the simplest of three sponge forms. these sponges are vaselike, with choanocytes directly lining the spongocoel
It is a sponge body form characterized by choanocytes lining radial canals
It is the sponge body form that has an extensively branched canal system. The canal lead to chambers lined by choanocytes
It is an immature stage that may undergo a dramatic change in structure before attaining the adult body form
It is a resistant, overwintering capsule formed by freshwater, and some marine, sponges that contains masses of mesenchyme cells Amoeboid mesenchyme cells are released and organized into a sponge
It is a sheet of cells covering the surface of an animals body. In invertebrates, a single layer of ectodermal epithelium
It is the endodermally derived lining of the gastrovascular cavity
It is the gel-like matrix between the epidermis and the gastrodermis of Cnidarians
They are epidermal and/or gastrodermall cells that produce structures called cnidae, which are used for attachment, defense, and feeding
It us a fluid-filled, intracellular capsule enclosing a coiled, hollow tube
They are a type of cnida used in food gathering and defense that may discharge a long tube filled with spines that penetrates the pray
It is the attached, usually asexual, stage of a cnidarian
It is usually the sexual stage in the lifestyle of cnidarians. The jellyfish body form.
It is the use of body cavity fluids confined by the body wall, to give support. Also called Hydroskeleton
It is a ciliated, free swimming larva of mot cnidarians. The planula develops following sexual reproduction and metamorphoses into the polyp
It is a structure that hangs from the oral surface of a cnidarian medusa and surrounds the earth.
It is an organ of the equilibrium and balance in many invertebrates. Statocyst usually consist of a fluid-filled cavity containing sensory hairs mdneral mass called a statolith. The statolith stimulates the sensory hons, which helps orient the animal to the pull of gravity.
It is a feeding polyp in a colonial hydrozoan.
It is a sensory structure at the margin of the sclyphozoan medusa. It consist of a statocyst and photo receptor
it is the polyp stage of a scypozoan
It is a miniature medusa produced by asexual bedding of a scyphistoma. Ephurae mature into sexually medusae
It is the condition in a monoecious organism in which the male gonads mature before the female gametes. This prevents self fertilization
They are rows of cilia that are the locomotor organs of ctenophores
They are the adhesive cells that capture prey.
The term for cheeks that are so elastic that they can expand to allow temporary storage of food. This is a derived trait found among the Cercopithecinae Old World monkeys.
What are the differences between sensitization and habituation?
What are the main characteristics of animals?
Using tools and toolmaking is an adaptation by hominins linked to:
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