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36 Cards in this Set

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Phylum Porifera
the sponges, marine animals consisting of loosely organized cells
Radial symmetry
infinite division, "asymmetrical"
Sessile
non-moving
Pinacocytes
thin, flat cells that line the outer surface of a sponge, may be mildly contractive / contraction may change the shape of some sponges
Choanocytes
"funnel + cell" / below the mesohyl/mesoglea layer / flagellated cells that have a collarlike ring of microvilli surrounding a flagellum / creates water currents through the sponge with flagellum
Mesoglea/Mesohyl
"middle matter" / just below the pinacocyte layer / jellylike layer
Ostia
little openings in the side of the tube of sponge / water comes through this area / the outer openings of porocytes and lead directly to a chamber called the spongocoel
Osculum
the big hole on the top of a sponge where water is pushed out
spongocoel
the middle chamber of a sponge that ostia lead to /
ascon sponge body form
the simplest and least common sponge body form / vaselike body form / tear drop shape
sycon sponge body form
sponge body form where the sponge wall appears folded / looks like it has folded layers / wrinkly
leucon sponge body form
sponge body form where the sponge has an extensively branched canal system / water moves through ostia and through canals and then to choanocyte-lined chambers / NO SPONGOCOEL / MULTIPLE OSCULUM
spicules
microscopic needlelike spikes that make up a sponge skelton and support sponge / formed by amoeboid cells / made up of calcium carbonate or silca
spongin
an alternative sponge skeleton / made of fibrous protein made of collagen /commercial sponges are these
monoecious
Most sponges are what type of reproductive system?
monoecious
both sexes occur in the same individual
sponge reproduction
sponges do not usually self-fertilize because individual sponges produce eggs and sperm at different times
sponge reproduction
Sperm and eggs are released from sponge oscula
sponge reproduction
sperm cells exit one sponge through the osculum and enter another songe with the incurrent water
cross fertilization
sponges fertilize by releasing sperm and eggs and the mix in water
asexual budding
some sponges bud
dioecious
means that an individual is only male or female
Phylum Cnidaria
hydras, jellyfish, sea anemones, corals / they are radially symmetric or biradial symmetric
biradial symmetry
modification of radial symmetry in which a single plane, passing through a central axis, divides the animal into mirror images
radially symmetrical animals
have no anterior or posterior ends / terms of direction on based on the position of the mouth opening
polyp cndarian body form
mouth is directed up / don't move much / they can slide / usually asexual and sessile / mouth covered with food-gathering tentacles
medusa cndarian body form
mouth, tenacles directed downward / shaped like an inverted bowl / tentacles dangle / DIOECIOUS / free swimming / mesoglea is more abundant in medusa than in polyp giving jellylike consistency
epidermis
the outer layer of the body wall
gastrodermis
the inner layer of the body wall
mesoglea
jellylike middle layer between epidermis and gastrodermis /
GVC (gastrovascular cavity)
cavity that lines the gastrodermis of all cnidarians / functions in digestion, exchange of respiratory gases and metabolic wastes, and discharge of gametes / things enter through mouth to GVC
cnidocytes
epidermal and gastrodermal cells in cnidarians that produce structures called cnidae which are used for attachment, defense, and feeding
cnida
fluid-filled, intracellular capsule enclosing a coiled, hollow tube / some are nematocysts which on jellyfish tentacles for stinging
cnidarian reproduction
asexual by budding / mostly sexual - dioecious / sperm and eggs may be released into GVC or to the outside of body
planula
embryo of cnidarian elongates to form these ciliated, free-swimming larva / they attach to a sustrate and a young polyp develops
hydra
class of small, relatively common cnidarians / vast majority are marine / "jellyfish"