: Most sea stars exhibit a distinctive starlike shape with five arms arranged around a central disc. However, some species can have up to 50 arms .
: Most species can regenerate lost arms; in some cases, a single separated arm can grow into a new sea star if part of the central ring nerve canal is attached. Ecological & Human Impact asteroidea
, commonly known as sea stars or starfish, are a highly diverse class of marine invertebrates within the phylum Echinodermata . With approximately 1,900 accepted extant species worldwide, they are found across all of the world's oceans, from the shallow intertidal zone to the deep sea (~6,000 m). Key Biological Features : Most sea stars exhibit a distinctive starlike