Photo: Sponge and sea tulip make nice

18 of 1098
18 of 1098

Our photo of the day comes from Middle Head, Sydney Harbour, Australia.

Photographer John Turnbull describes this striking photo of a sponge and a giant sea tulip ascidians (Pyura spinifera) as "Sponge and not sponge." He explains:

"The animal on the left is a simple one – a sponge, which has no distinct organs and merely filters water for its food. On the right in pink is an ascidian – more complex, with an animal living inside each "tulip." Ascidians have a rudimentary spinal cord in their larval stage (notocord) and body parts such as a heart, stomach, intestines and enlarged pharynx which they use to also filter food from seawater."

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