organisms phylum that are included in the Deuterostomia.
The phylum that is included in the Deuterostomia are:
1. Chordata (which includes vertebrates and some invertebrates)
2. Echinodermata (such as sea stars, sea urchins, and sea cucumbers)
3. Hemichordata (like acorn worms)
4. Xenoturbellida (a small phylum with only two known species)
The phylum Deuterostomia includes several different organisms. Here are some examples:
1. Chordates: This group includes vertebrates, which are animals with a backbone, as well as some invertebrates such as tunicates and lancelets.
2. Echinoderms: This group includes organisms like starfish, sea urchins, and sea cucumbers. They have radial symmetry and a unique water vascular system.
3. Hemichordates: The hemichordates include organisms known as acorn worms. They have a structure called a proboscis that they use for feeding, and some also have a collar and a trunk.
These are just a few examples of the organisms included in the phylum Deuterostomia.
To find out the phyla included in the Deuterostomia, you can follow these steps:
1. Understand Deuterostomia: Deuterostomia is one of the major groups or superphyla within the animal kingdom. It is characterized by a particular pattern of embryonic development called deuterostomy, where the blastopore (the first opening in the developing embryo) becomes the anus.
2. Identify the major phyla: Within the Deuterostomia superphylum, there are three major phyla:
a. Chordata: This phylum includes organisms with a notochord (a flexible rod-like structure), a hollow dorsal nerve cord, and pharyngeal slits. Examples of organisms in this phylum include vertebrates like fish, reptiles, birds, and mammals.
b. Echinodermata: This phylum consists of marine organisms characterized by a spiny exoskeleton, a water vascular system, and a unique five-fold symmetry. Some examples of organisms in this phylum are starfish, sea urchins, and sea cucumbers.
c. Hemichordata: This phylum includes small marine organisms such as acorn worms and pterobranchs. They have characteristics of both chordates and invertebrates, exhibiting pharyngeal gill slits and a dorsal nerve cord.
3. Additional phyla: Apart from the major phyla mentioned above, there are some lesser-known phyla classified under Deuterostomia, including Xenoturbellida and Chaetognatha.
In summary, the phyla included in the Deuterostomia superphylum are Chordata, Echinodermata, Hemichordata, Xenoturbellida, and Chaetognatha.