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LS AD Chapter 1

Invertebrates

TermDefinition
Invertebrate A creature lacking a backbone
Vertebrate A creature with a backbone
Porifera The phylum of creatures which includes sponges
Cnidaria The phylum of creatures which includes jellies, anemones, and ocean coral
Platyhelminthes The phylum of creatures which includes flatworms
Nematoda The phylum of creatures which includes roundworms
Ectoderm Means "outer covering" or "outer skin". Refers to outer layer of cells on a sponge
Choanocyte Collar cells lining the inner surface of a sponge. These generate water current by spinning their flagella. They capture food with the sticky collar, then pull the food into their mouth.
Spicule Structure in the body of a sponge; made of carbonate or silicate material. Responsible for the spines found on the surface of some sponges.
Collagen Flexible protein found in tendons and ligaments in humans. Also found in fibers of fibrous (soft) sponges.
Demospongia Class of sponges in phylum Porifera. The bath sponges are members of Demospongia.
Calcarea Class of sponges in phylum Porifera. The "rock" sponges are members of Calcarea.
Hexactinellida Class of sponges in phylum Porifera. The "glass" sponges are members of Hexactinellida.
Amebocyte Motile cell in the body of a sponge. Responsible for carrying food from collar cells to ectoderm cells.
Hydrozoa Class of Cnidarians including hydra and Portugese man O War
Scyphozoa Class of Cnidarians that includes true jellies.
Cubozoa Class of Cnidarians that includes box jellies
Anthozoa Class of Cnidarians that includes corals and anemones
Planula Larvae form of a cnidarian. Has small hairs for swimming until settling to ocean floor.
Budding Polyp Product of asexual reproduction in cnidarians. Identical to parent polyp.
Mid-Sagittal Plane that divides a bilaterally symmetric creature into a right and left half.
Frontal Plane that divides a bilaterally symmetric creature into a dorsal and ventral.
Transverse Plane that divides a bilaterally symmetric creature into a posterior and anterior.
Coelem A hollow interior cavity, surrounded on all sides by mesoderm.
Turbellaria Class of Platyhelminthes which includes planaria and most marine flatworms.
Tremetoda Class of Platyhelminthes which includes flukes.
Cestoda Class of Platyhelminthes which includes tapeworm.
Nematocyst Stinging cell of Cnidarians.
Sessile Stationary. Having a lifestyle of little movement.
Bilateral Symmetry Symmetry with only one plane that divides the creature into two identical halves.
Radial Symmetry Symmetry with multiple planes that divide the creature into two identical halves.
Polyp The sessile form of the Cnidarian life cycle
Medusa The motile form of the Cnidarian life cycle
Hermaphrodite A creature with no specific gender. Generates both male and female gametes.
Herbivore A creature for which plant matter is the exclusive diet.
Carnivore A creature for which animal matter is the exclusive diet.
Omnivore A creature for which both plants and animals form the diet.
Created by: MrGross