Starfish are echinoderms, a form of invertebrate marine animals known for radial symmetry and having spiny skin. Researchers said most animal species have similar genetic structures, prompting ...

Scientists couldn't find the starfish head for the longest time as they were looking in the wrong place. Turns out, the head is all over its body.

It describes their unique body structures, including radial symmetry and spiny skin, ... Echinoderms, Starfish & Sea Urchins. Posted: March 22, 2025 | Last updated: March 26, 2025.

A journey back in time to trace the ancestors of starfish. For 25 years, Andrew Smith, a palaeontologist at the Natural History Museum in London, has been troubled by a question of symmetry. It ...

Except Ctenoimbricata didn’t have radial symmetry. It had right-left bilateral symmetry like us, where the left half mirrors the right half, and its mouth faced upwards at one end of its body.

Instead, starfish have pentaradial bodies with five-sided symmetry branching from a central hub. Biologists believe that starfish and other echinoderms evolved from an earlier ancestor which was ...

This comes in the form of five arms for most starfish, although some species have even more — adult sunflower sea stars, for example, can have up to 24 arms. The five-armed shape is in stark contrast ...

This seems to have solved the mystery of how the starfish got its arms. But it doesn’t necessarily answer the ‘why’. Imran and his colleagues are still in the dark as to why starfish and their ...

Yet, as wild as it sounds, you might share more with a starfish than the common cockroach scuttling under your kitchen sink. This isn’t just a quirky fact—it’s a scientific revelation that ...

A 500-million-year-old fossil from Morocco, discovered by Natural History Museum scientists, is offering extraordinary new insights into one of evolution's most puzzling transformations: how ...

Starfish, sea urchins and all other known living echinoderms have a symmetry that allows them to be sliced into five identical parts, but some of their counterparts in the Cambrian period, which ...

Symmetry runs rampant in nature. It’s present wherever mirror images are repeated, like in the right and left halves of elephants or butterflies, or in the repeating patterns of flower petals ...