Question

Which group of chordates possess sucking and circular mouth without jaws?

Answer 1

Hint: Chordates are the phylum of the animals that have some stages of the development. These are possessed by the notochord and help in their development. Here, we are going to find the group of chordates which possess both sucking and circular mouth without the jaws. Through some of the ideas it could be analyzed.

Complete answer:
Chordata are the deuterostomes. These consist of mainly three groups such as vertebrates, tunicates as well as lancelets. These are based on bilateral body pain. These are mostly coelomates which have the fluid body cavity that are commonly known as coelom. That is during the stage of embryo development, the anus forms before the mouth. The following are the characteristics that come under chordates. They are as follows:

HIGHER CLASSIFICATION	Deuterostome
SCIENTIFIC NAME	Chordata
BIOLOGICAL RANK	Phylum
SUBKINGDOM	Eumetazoa
SUPERPHYLUM	Deuterostomia

Here, the class cyclostomata that comes under phylum Chordata which has the character like possessing the circular mouth without the jaws. So, we can justify that the cyclostomata possess sucking and the circular mouth that includes the jawless fishes. These are also called agnathans. These are very much essential in the ecosystem as they keep up the maintenance of the ecosystem.

Note:
Chordates are the deuterostomes which possess a notochord. These mostly include the aquatic animals that are remaining persistent in the adult stage. This functions as the passage of the respiratory tract that contains water current through the mouth. This is the type of phylum that is most notably portable. This is also considered as the third largest phylum.