Among the larger known sponges at up to a meter in height and width, the common name Neptune's cup refers to its characteristic wine glass shape and the Roman god of the sea. The species was thought to be extinct since the early 1900s due to overharvesting, but live specimens were discovered in 2011 off the coast of Singapore and Thailand. Later they were transported so they can be close enough to reproduce. In the early 1900s, they were used as baby baths because they grew so large. They can grow up to 5m, and grow a couple centimeters every month.
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- Platt, John R. (17 November 2011). "Amazing Neptune's Cup Sponge Rediscovered in Singapore". Extinction Countdown blog. Scientific American. Archived from the original on 18 November 2011. Retrieved 2011-11-17.
- Attenborough, David (2016). Wild City:Islands. Channel NewsAsia.
- Hance, Jeremy (22 November 2011). "Bathtub-sized marine sponge rediscovered after a century of extinction". news.mongabay.com.
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