Curated OER
Invertebrate Chordates
Most chordates are easy to identify because of the specific classification criteria of their phylum. But what about tunicates? Young scientists read a short explanation about why tunicates, or sea squirts, are considered to be members of...
Palomar Community College District
Palomar College: Kingdom to Subphylum
The highest category of taxonomic classification is the kingdom. This website from Palomar College presents the five kingdoms in an easy-to-read chart and discusses the Animalia and Plantae kingdoms in depth. After reading through the...
Khan Academy
Khan Academy: Human Embryogenesis
Explains what happens during embryogenesis, the first eight weeks of pregnancy.
University of California
Ucmp: Introduction to Chordata
This site from UC Berkeley is an excellent site about the animal phylum chordata. Click on various sections to learn more, covering topics such as the fossil record, life history & ecology, systematics, and morphology. This site is a...
University of California
Ucmp: Introduction to Urochordata
This site introduces Urochordates and mentions the characteristics of Chordates that Tunicates exhibit. There are links to additional information about Chordate Characteristics
CK-12 Foundation
Ck 12: Biology: Invertebrate Evolution
[Free Registration/Login may be required to access all resource tools.] An overview of the major events in invertebrate evolution.
Untamed Science
Untamed Science: Phylum Chordata
Learn about the characteristics, classification, and phylogeny that make the Phylum Chordata, a distinct animal classification group. See examples and photos of different species of chordates.
CK-12 Foundation
Ck 12: Life Science: 10.1 Chordates
Explore the behaviors, characteristics, and diversity of chordates.
California Academy of Sciences
California Academy of Sciences: Echinoderm Webpage
Resource provides a brief overview of echinoderms. Includes pictures and links for more information.
University of California
Ucmp: More on Morphology
A concise site that describes the four basic features that all chordates share.
CK-12 Foundation
Ck 12: Biology: Invertebrate Chordates
[Free Registration/Login may be required to access all resource tools.] Discusses the characteristics of the two major subphyla of chordates without a backbone.