What are the characteristics of Cephalochordata?
What are the characteristics of Cephalochordata?
Cephalochordates and vertebrates have a hollow, dorsal nerve cord, pharyngeal gill slits, and a notochord. In most vertebrates, the embryonic notochord is eventually replaced by bony vertebrae or cartilaginous tissue; among cephalochordates, the notochord is retained into adulthood and is never replaced by vertebrae.
Do Cephalochordata have bones?
Unlike vertebrates, urochordates and cephalochordates never develop a bony backbone.
Does Cephalochordata have head?
The body of cephalochordates is fish-like and is adapted for swimming and burrowing. Adult cephalochordates have a head and a tail but, do not have appendages. Instead, dorsal, ventral, and caudal fins are present in the body.
Does Cephalochordata have Endoskeleton?
The phylum Chordata has three Subphyla, the Urochordata, the Cephalochordata and the the Vertebrata. Only the first two are invertebrates. The chordata have an endoskeleton so they can grow continuously without moulting.
What coelom is found in Cephalochordata?
Coelom of Branchiostoma (With Diagram) | Cephalochordata | Chordata | Zoology. ADVERTISEMENTS: The body cavity is a well-developed coelom lined with somatic and splanchnic mesodermal epithelium. It contains a lymph-like coelomic fluid.
How do animals of Urochordata differ from those of Cephalochordata?
The main difference between Urochordata and Cephalochordata is the location and presence of notochord. In urochordates, the notochord is present in the larval tail, whereas, in cephalochordates, the notochord is present throughout the life and extends from the head to the tail region.
What are the affinities of Cephalochordata?
Chordate Affinities: Cephalochordata (Branchiostoma) exhibits the three basic chordate features such as notochord, dorsal tubular nerve cord and pharyngeal gill-slits in the most typical manner and there is no doubt about its chordate nature.
Do cephalochordates have appendages?
Appendages appeared during the early evolution of the fishes. Fins are present in fishes and limbs are present in land vertebrates. Paired appendages are not present in hemichordates, urochordates and cephalochordates.
How cephalochordates are different from Urochordata?