Echinodermata
No, chaetognaths are not considered deuterostomes. They belong to the phylum Chaetognatha (arrow worms), which are classified as protostomes. They are characterized by certain developmental and anatomical features that distinguish them from deuterostomes.
Our close relative phylum are the echinoderms because they are also deuterostomes.
The phylum that have a true coelom and are deuterostomes are the phylum Chordata. This phylum includes animals with a notochord, dorsal nerve cord, pharyngeal slits, and post-anal tail at some stage in their development. Examples of Chordata include vertebrates such as fish, amphibians, reptiles, birds, and mammals.
Deuterostomes that show radial symmetry in their adult form called phylum Echinodermata. Phylum Echinodermata are things like sea stars, sea urchins and sea cucumbers.
They are neither a deuterostome or a protostome, since they only have one opening.
Yes, lancelets are deuterostomes. Deuterostomes are a group of animals characterized by their embryonic development, in which the blastopore becomes the anus. Lancelets belong to the phylum Chordata along with vertebrates, and they exhibit deuterostome development.
Snails have both exoskeleton and endoskeleton. The shell is the exoskeleton. And the remaining part is endoskeleton.
The spine is a part of the endoskeleton.
None of them. An invertebrate is, by definition, an animal which has no spine.
No, sponges are not deuterostomes. Deuterostomes are a distinct classification of animals characterized by a particular pattern of embryonic development, which includes echinoderms and chordates such as humans. Sponges belong to the phylum Porifera, and they are considered one of the most basal and primitive animal groups.
There are many. The only phylum that contains invertebrates with exoskeletons are Echinoderms. An example is cuttlefish.
Eucoelomata is further divided into two subgroups: Protostomia and Deuterostomia. Protostomes include groups like arthropods, annelids, and mollusks, where the blastopore becomes the mouth. Deuterostomes include chordates, echinoderms, and hemichordates, where the blastopore becomes the anus.