Echinodermata
sea star and ocean fish star
mammalia
Hexapoda (I may be wrong though).
No, most animal phyla don't have brains either.
The phyla that show cephalization include Chordata (which includes vertebrates), Arthropoda (including insects, crustaceans, and spiders), Annelida (segmented worms), and Mollusca (which includes snails, clams, and octopuses).
Phyla: Echinoderms Class: -Asteroidea - Sea stars -Ophiuroidea - Brittle stars -Holothoridea- Sea cucumbers
A starfish is actually an echinoderm. Its Its water vascular system and lack of segmentation, or even an exoskeleton composed of chitin, mean that it is not an arthropod in ANY sense...two completely different phyla.
Sea StarsJellyfishSponges
A sea star is called a sea star simply because of where it lives (the sea) and what it looks like (a star), simple!
no, a sea star is a vertebrate!
the sunflower sea star
The nine most populous animal phyla include several invertebrates, notably Arthropoda (insects, arachnids, crustaceans), Mollusca (snails, clams, octopuses), Annelida (segmented worms), Cnidaria (jellyfish, corals, sea anemones), and Echinodermata (starfish, sea urchins). These phyla collectively encompass a vast diversity of species and play crucial roles in ecosystems. In contrast, the five most populous phyla, including Chordata (vertebrates), contain both invertebrates and vertebrates.