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Porifera & Cnidaria

TermDefinition
Porifera the sponges; pore-bearing
Marine lives in the ocean
Sessile permanently attached to a substrate; not motile
Ostia incurrent pores on the epidermis of the sponge where water enters the sponge
Osculum large opening at the top of the sponge where water water and waste leave the sponge
Spongocoel hollow cavity inside the body of the sponge; opens to the osculum
Mesenchyme jelly-like material between the epidermis and endoderm of the sponge
Choanocyte (collar cell) Cell type lining the endoderm of the sponge. Has a flagellum that spins to move water, trapping plankton and organic matter in the "collar" of the choanocyte.
Amebocyte Cell type that moves through the mesenchyme of the sponge, picking up food from choanocytes, digesting it, and delivering the nutrients to other cells
Spongin network of protein fibers in the sponge that provides structural support
Spicule hard spear of star-shaped structure in a sponge that provides structural support; made of limestone or silica
Hermaphrodite has both male and female reproductive organs
Gemmule specialized bud made by sponges to survive harsh environments; contains food, amebocytes and spicules
Cnidaria stinging sea animals
Polyp cylindrical form of a cnidarian; bottom attaches to a substrate; mouth and tentacles face "up"
Medusa flattened bell shape form of a cnidarian; motile; mouth and tentacles face "down"
Gastrodermis cell layer forming a gastrovascular cavity (stomach) in a cnidarian
Mesoglea jelly-like material between the epidermis and gastrodermis of a cnidarian
Cnidocyte cell type that contains nematocysts
Nematocyst Stinging capsule that releases a barbed or venomous thread at high speed; used for self defense or to catch prey
Hydra a freshwater cnidarian; lives in polyp form
Class Hydrozoa includes hydras and Portuguese Man-O-War
Class Scyphozoa includes jellyfish
Class Anthozoa includes anemones, corals, sea fans and sea whips; usually in polyp form
Class Cubozoa includes the box jellies
Created by: onceamustang
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