protostomes:)
In protostome ("first mouth") the blastopore, or the first opening formed becomes the mouth. In deuterostomes ("second mouth"), the blastopore forms the anus and the mouth develops from a second opening.
blastopore
Its a deuterostome
blastopore
blastopore
At the stage of development when the gut forms there is only a single opening into the digestive track, this opening may become either the mouth or anus. In the echinoderms, chordates, and hemichordates the blastopore becomes the anus and a new opening forms the mouth, these are called deuterostomes
In deuterostomes, the first opening that develops during embryonic development is called the blastopore. This opening typically develops into the anus, while the mouth forms later from a secondary opening. This is in contrast to protostomes, where the blastopore usually becomes the mouth. Examples of deuterostomes include chordates and echinoderms.
Deuterostome development is a type of animal embryonic development in which the blastopore becomes the anus during gastrulation. This process is characterized by radial cleavage, indeterminate cleavage, and formation of an anus before a mouth. Deuterostomes include organisms such as vertebrates, echinoderms, and some invertebrate chordates.
The blastopore is located at the site of the invagination during the early stages of embryonic development in organisms that undergo gastrulation. In protostomes, it typically develops into the mouth, while in deuterostomes, it usually becomes the anus. The position of the blastopore is crucial for determining the body plan of the developing organism.
Coelomates that develop with the blastopore becoming the mouth are protostomes. An example of a protostome would be the Caribbean reef squid.
Animals in which the anus develops before the mouth belong to a group called deuterostomes. Examples include echinoderms (such as starfish and sea urchins) and chordates (which include vertebrates like humans). During early embryonic development in deuterostomes, the blastopore develops into the anus first, with the mouth forming later.
Protostomes Deuterostomes 1.Mouth develops first then anus 1. Anus develops first then mouth 2.Blastopore develops into mouth 2.Blastopore develops into anus 3.Coelom absent and a schizocoel 3. Coelom develops as enterocoel by fusion develops by a split of mesoderm of gut pouches. 4.Cleavage is spiral and determinate 4. Cleavage is radial and indeterminate. 5.Larva is trochophore. 5. Larva is bipinnaria or tornaria 6.E.g. Molluscs, annelida & 6.E.g. Echinodermata & Chordata arthropodes