Lilies of the deep

The deep is truly a dark and scary place to live- but for other marine animals, it is their home. Welcome again to our #WildlifeWednesday featuring a deep-sea living fossil echinoderm known as the Sea Lily.

Sea lilies or stalked crinoids have stems emanating from underneath their crown with the bottom end attached to a hard substratum such as rocks. They are known as the ancestors of feather stars, which have no stems, can swim freely, and live on shallow warm waters.

Because sea lilies are attached firmly to a hard surface, scientists thought that they cannot move from one place to another. Interestingly, they found out that sea lilies could relocate themselves by detaching their segments anchored on the sea bed, then settle themselves in a new location. They regenerate their lost parts as they live in their new settlement. To prove that they can also move, scientists were able to capture a video of a sea lily “running” away from a predator. Sea lilies spread their arms to filter the seawater that passes through to capture and feed on plankton.

Fossil records of sea lilies indicate that they existed and became abundant in the shallow parts of the sea before the age of dinosaurs. But as time passed, they became less abundant, with only their unstalked offspring dominating the shallow tropical seas to this day. Now, most of the stalked crinoids reside in the deep parts of the ocean ranging from 1,000 to 9,000 meters.

You may visit Gallery 4 – Life Through Time exhibit at the National Museum of Natural History and see the actual specimen of the Sea Lily from the Philippines.

Text and photo by NMP Zoology Division

© 2022 National Museum of the Philippines