This is straight from dictionary.com, so no credit for me:
"any member of the lower invertebrate phyla in which the mouth appears before the anus during development, cleavage is spiral and determinate, and the coelom forms as a splitting of the mesoderm." That help? :)
Coelomates that develop with the blastopore becoming the mouth are protostomes. An example of a protostome would be the Caribbean reef squid.
Protostomes. Development begins with spiral, determinate cleavage. Coelom formation then begins in the gastrula stage, the coelom forming from splits in the mesoderm. The mouth then develops from the first opening, the blastopore, and the anus develops secondarily.
Bivalves are protostomes. They belong to the phylum Mollusca, which is characterized by protostome development. This means that during their embryonic development, the blastopore becomes the mouth.
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.
Tortoise have endoskeleton because as they move with the help of limbs and limbs only loco mote because they have the combination of Bones & Muscles.The shell is considered a exsoskeleton. The tortoise and turtle have both an endoskeleton and exsoskeleton. ---tylerdude1233thank you,REGARDSAAKASH PAL
the difference is that a duetrostome (second mouth) is the end and the protostome(first mouth) is the begining.
Coelomates that develop with the blastopore becoming the mouth are protostomes. An example of a protostome would be the Caribbean reef squid.
deuterostomes
protosome
Yes, annelids belong to the protostome group of animals. Protostomes are a group of animals whose blastopore develops into the mouth first during embryonic development. Annelids, such as earthworms and leeches, exhibit characteristics consistent with protostome development.
An example of a protostome is a snail. Protostomes are organisms in which the blastopore, the opening of the developing embryo, becomes the mouth of the adult organism.
protostome development
Deuterostome and protostome are two different ways in which animals develop. In deuterostome development, the first opening that forms becomes the anus, while in protostome development, the first opening becomes the mouth. This difference in the formation of the digestive tract is a key distinction between the two processes.
Gastrulation
Protostome means the blastopore becomes the mouth during embryonic development, and deuterostome, the anus. We're deuterostomes.
Protostome development involves the blastopore forming the mouth first, while deuterostome development involves the blastopore forming the anus first. This difference in embryonic development leads to distinct patterns of cell division and fate determination in these two groups of animals.
protostome