20 March 2019

Creature feature: Meet the dumbo octopus

Illustration by Maxeen Bayer based on the Disney character Dumbo

Deep in the ocean floor lives an octopus, its common name derived from the Disney character Dumbo who can fly with its big ears. Just as the sky is for the endearing elephant, the dumbo octopus hails from the deep, steering the waters by flapping its ear-like fins [1].

To date, there are 21 known species of dumbo octopus (Grimpoteuthis) [2]. Being bathypelagic animals, they live 13,000 feet below water (or almost 4000 m) and are rarely seen in shallow waters. They live in tropical to temperate latitudes and have been observed in New Zealand, California, Oregon, Philippines, and in other areas [3].

Dumbo octopus comes in different sizes, shapes, and colors. Its average size is 20 to 30 cm (7.9 to 12 inches) in length and its mantle, either U- or V-shaped. Like other families of octopi, their tentacles are umbrella-shaped, characterized by webbing between their tentacles, which help them navigate while swimming and crawling on the surface. Their ear-like lateral fins also help them propel around the water [4].

Grimpoteuthis has large eyes, about a third the diameter of their head, but it has limited use in the eternal darkness of the deep oceans. However, to defend itself against predators, it uses its ability to change color and camouflage against the ocean floor. When it camouflages, the ears emit a different color than the rest of its body [4].

They are carnivorous, eating isopods, amphipods, bristle worms and more. Their mouth is different from their kin, engulfing their prey rather than grinding and ripping [1].

The male octopus has a special protuberance in one of its 8 tentacles used to deliver the sperm to a female octopus, which the octopus stores until conditions are favorable for laying eggs on shells or small rocks on the seafloor. Young dumbo octopi are large when they are born and must survive on their own. They can live for 3 to 5 years [1].

Very little is known about these creatures. If you have more information on dumbo octopus, SeaLifeBase welcomes collaboration. Kindly send us a message at sealifebase(at)q-quatics(dot)org.

Written by Maxeen Danielle Bayer

[1] Helmenstine, A.M. (2018, April 24). All about Grimpoteuthis, the dumbo octopus. ThoughtCo. Retrieved from https://bit.ly/2W3CUtP
[2] WoRMS Editorial Board (2019). World Register of Marine Species. Available from http://www.marinespecies.org at VLIZ. Accessed 2019-03-15. doi.10.14284/170
[3] Oceana. Cephalopods, crustaceans and other shellfish: dumbo octopus. Retrieved from https://bit.ly/2Jfo2qM
[4] Ocean Conservancy (2018, October 8). Everything you need to know about the dumbo octopus. Retrieved from https://bit.ly/2OAYNBg
[5] National Geographic (2018, October 29). Rare dumbo octopus shows off for deep-sea submersible. YouTube. Retrieved from https://bit.ly/2u9gcEP

04 March 2019

World Wildlife Day 2019 celebrates marine life

Photo from UNDP

United Nations World Wildlife Day has been celebrating the sheer diversity of plants and animals for six years now by raising awareness on the threats they're facing through a series of events across the globe. 

Inspired by UN's 14th Sustainable Development Goal (SDGs)—life below water—this year marks the first ever World Wildlife Day to celebrate the huge importance of marine life in our everyday lives. It also commemorates the establishment of CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora), a treaty which underscores the protection of all endangered plants and animals.

This event gives the opportunity to highlight critical issues faced by marine life, commend successful initiatives for their conservation and scale up future endeavors towards sustaining them for future generations.

One of the major concerns that this campaign addresses is plastic pollution, in which 57 countries have already vowed to reduce their use of single-use and non-recoverable plastics.  

It's a step further to know more about the marine species we need to protect. And SeaLifeBase hosts this information. If you're keen to dive deep into the threatened non-fish marine species in the Philippines (and around the world), you may visit SeaLifeBase.