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These flashcards cover key terms and definitions related to the phyla Porifera, Cnidaria, Platyhelminthes, Annelida, and Nematoda from the lecture notes.
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Porifera
The phylum of multicellular organisms known as sponges, characterized by a lack of tissues and organs.
Spicules
Structural elements found in sponges that provide support; they can be made of calcium carbonate, silica, or spongin fibers.
Gemmules
Asexual reproductive structures formed by some freshwater sponges, enabling survival in harsh conditions.
Canal System
The arrangement of canals in sponges through which water flows, allowing for filter feeding.
Cnidarians
A phylum that includes organisms such as jellyfish, corals, and anemones, characterized by radial symmetry and the presence of cnidocytes.
Nematocyst
A specialized cell in cnidarians that contains a stinging structure for capturing prey.
Planarians
Flatworms belonging to the class Turbellaria, known for being free-living and possessing a complex nervous system.
Dioecious
Having male and female reproductive organs in separate individuals.
Metamerism
The division of an organism's body into repeating segments, seen in annelids.
Cuticle
A protective layer covering the body of nematodes, aiding in moisture retention and protection against environmental hazards.