 development protostome versus deuterostomes, first the contents, development of mouth and anus, slown formation and the larval types in protostomes and the deuterostomes. So first the development of mouth and anus. So if we talk about protostomes and deuterostomes, a comparative study tells that the developmental differences present in protostomes and deuterostomes include the formation of mouth and the anus. In case of protostomes, the blastopore which is formed during the gastrolation process that is ultimately converted into mouth. If we talk about protostomes, then during the gastrolation, the blastopore which is formed, it is either closed or not in some cases, in fact most of the cases it remains open and it is developed into the mouth, it will develop in the mouth, so as the blastopore is forming the mouth, then the protostome is formed in the mouth first. When the anus develops from some other portion, it will develop on the opposite portion or on the opposite side and the anus will develop separately. In these cases, deuterostomes are opposite to the deuterostomes. In deuterostomes, the blastopore is converted into anus. When the blastopore is converted into anus, the mouth or oral cavity will develop from some other end, the distal end, the opposite end will develop from there. If we look at it in a simple way, then the blastopore is on one side of the gastrolation, If the cavity is opening from here, then the anus will develop in protostome and in deuterostomes, the anus will develop from here. When we have a position on the opposite side of the case, then the anus will develop in protostome and in deuterostomes, the mouth will develop from here. House is on different side of the stage. Siloam formation. So, siloam is the body cavity. Siloam is the body cavity. There are a lot of proto-storms in which the siloam is present. There are a few proto-storms in which the siloam is not formed. For example, platyhylaminthase is not formed in siloam, but just in A-silomates. The siloam formation in the proto-storms, if we discuss the siloam formation pattern in that, initially, there is a solid mass of mesenchyme cells. Mesenchyme or mesodermal cells have a solid mass. Later this mass will split. This mass will split and siloam will be formed. While in the case of deuterostomes, in deuterostomes, siloam is formed by the out-poaching of orcantiron. Orcantiron is made out of out-pockets. Later, the mass is spread between the mesoderms. It forms the siloam. The major difference between proto-storms and deuterostomes is that in proto-storms, mesoderm is formed by splitting of mesodermal cells or mesenchyme. Whereas in deuterostomes, siloam is formed by the out-poaching of the orcantiron. There will be some out-poaching from the orcantiron which will be converted into siloam. Here in this diagram, you can see that One. Siloam formation we have on the top of this that we will have siloam formation in deuterostomes. So first, out-pockets from the out-poaching and the updates will spread between the acroletororm and endoderms. It will have siloam formation. This pattern among deuterostomes is called interosilus pattern. While in case of protostromes, the mesodermit is present in the solid mass. In solid mass, the mesodermit is present. Later on, the mesodermit will split and the selom will be formed. This pattern by which the mesodermit is formed by the splitting of mesoderm. The pattern by which the selom is formed by splitting of mesoderm is called schizosilus selom formation. If the selom is split off because of the mesodermit, it is a schizosilus pattern and if it is formed because of out poaching, it is an interosilus pattern. Larval Stages Many of the phyla of animal kingdom have larvae. Both animal kingdom, especially protostromes have larvae. Many of protostromes have larvae and this larvae having specific name that is called prokofor larvae. Protostromes have prokofor larvae. When it is present in deuterostromes, all deuterostromes do not have larvae. But when it is present, it is a specific kidney shape and it is called dipylerolar larvae. Dipylerolar larvae in deuterostromes have prokofor larvae. The first one is the prokofor larvae. This prokofor larvae has a specific structure. The second one is the dipylerolar larvae.