Is Spiders Protostome Or Deuterostome?
WouterProtostomes and deuterostomes are animals that have a common ancestor. However, there are differences between the two groups. Among other things, deuterostomes and protostomes have different mouths.
The deuterostomes include the vertebrates, echinodermata, and mollusks. Several other invertebrate groups, including the annelids, nematodes, and mollusks, are protostomes. These protostomes have a relatively simple composition of their bodies.
Deuterostomes, on the other hand, have evolved over a long period of time. In many cases, they have retained features that are unique to their ancestor. In addition, deuterostomes have more complex body plans. For example, some deuterostomes have brains, and some mollusks have specialized rings around their mouths.
The earliest undisputed terrestrial animal fossils date to 400 million years ago, and are found in Europe, Scotland, and Germany. The oldest invertebrate fossils include scorpions, centipedes, wingless insects, and other species.
Cnidarians and protostomes are similar in that they have bilateral symmetry. They share certain genes that are involved in multicellularity. They also have a common system for controlling head development. The mouths of these protostomes and cnidarians are differentiated by the timing of mouth formation. Some protostomes have a specialized ring-like structure surrounding their mouths to enable suspension feeding and filter feeding.
The embryo of an animal is formed by the fusion of two gametes. This process is called ciliation. The gastrointestinal tract is channeled to the embryo through the anus. When the zygote completes the ciliation process, it has the ability to filter and transport food particles and water into the intestines.
