Animal Phyla and Characteristics of Chordata
Animalia Phyla
Definition of Animalia: The kingdom Animalia encompasses a vast array of organisms that are multicellular, heterotrophic, and primarily reproduce sexually.
Importance of Identifying Phyla: Understanding different phyla is crucial for the classification and identification of animals in biological sciences.
Instruction: You will need to identify each of the phyla by sight.
List of Common Animal Phyla with Examples:
Phylum Porifera
Example: Sponges
Phylum Cnidaria
Example: Jellyfish
Phylum Platyhelminthes
Example: Flatworms
Phylum Nematoda
Example: Roundworms
Phylum Mollusca
Example: Snails
Phylum Annelida
Example: Earthworms
Phylum Arthropoda
Example: Insects
Phylum Echinodermata
Example: Starfish
Phylum Chordata
Example: Mammals
Phylum Chordata
Definition of Phylum Chordata: Chordates are animals that exhibit certain characteristics during at least one stage of their development.
Four Characteristics of Chordates:
Notochord:
A flexible, rod-shaped body structure that provides support. In vertebrates, it is replaced by the vertebral column (spine).
Dorsal Hollow Nerve Cord:
A tube-like structure located above the notochord that develops into the central nervous system, including the brain and spinal cord.
Pharyngeal Slits:
Openings in the throat region that are present during embryonic development. In some species, they develop into gills, while in others, they are modified for different functions.
Post-anal Tail:
An extension of the body that is present after the anus. This structure is used for locomotion in many species.
Chordata Classes
List of Chordata Classes with Examples:
Class Mammalia
Example: Humans (Homo sapiens)
Class Aves
Example: Eagles
Class Reptilia
Example: Snakes
Class Amphibia
Example: Frogs
Class Chondrichthyes
Example: Sharks
Class Agnatha
Example: Lampreys
Class Osteichthyes
Example: Goldfish