General Zoology Lab - Porifera, Cnidaria, Platyhelminthes, Annelida, Nematoda

These flashcards cover key terms and definitions related to the phyla Porifera, Cnidaria, Platyhelminthes, Annelida, and Nematoda from the lecture notes.

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.