The protochordates (General characteristic features)
Protochordates are commonly called lower chordates. They lack a head and a cranium, so they are also known as Acraniata. Protochordates consists of three sub-phyla […]
Month: January 2018
General characteristic features of phylum Chordata
Chordates are bilaterally symmetrical, deuterostomial, eucoelomate eumetozoans. A flexible but firm supporting skeletal rod, called notochord is present in the embryo or throughout life. From […]
General characteristic features of superclass Pisces (Fish)
They are the first jawed vertebrates and the study of fish is called Ichthyology. They are aquatic (may be fresh water or marine). Fish are […]