Phyla such as Porifera (sponges) lack organs and have asymmetrical or no specific body symmetry. Another example is Placozoa, which also lack organs and have asymmetrical body shapes.
They belong to the phyla Platyhelminthes, along with the flatworms. Members in this phyla are acoelomates.
Yes
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asconoid sponges, and syconoid
Two other phyla members of a roundworm are Nematoda and Nematomorpha. They are both non-segmented worms that belong to the superphylum Ecdysozoa along with roundworms (phylum Rotifera).
An exoskeleton is an external skeleton that protects and supports the animal's body. Two phyla that have exoskeletons are Arthropoda and Heterokontophyta.
Sponge phyla primarily include Porifera, which contains various classes and species of sponges. Other members of the animal kingdom that are related to sponges, albeit not within the same phylum, include members of phyla such as Cnidaria, which includes jellyfish and corals, and Ctenophora, known as comb jellies. Both of these phyla share some primitive characteristics with sponges but are distinct groups with their own unique features.
All phyla contain invertebrates. The only one that contains vertebrates is the phylum Chordata, but it also contains some invertebrates.
Arthropoda and Heterokontophyta
In the Linnaeus system, organisms within the same class contain similar phyla. Classes are one taxonomic rank above phyla and encompass groups of organisms that share similar characteristics and evolutionary relationships.
sea star and ocean fish star