Image of the Day: Circularity

A marine flatworm swarms in a circular fashion off the coast of Guernsey.

Aug 15, 2018
Sukanya Charuchandra
The worm Symsagittifera roscoffensis undergoes circular milling.
ANA B. SENDOVA-FRANKS ET AL./THE ROYAL SOCIETY, OPEN SCIENCE

Researchers studied the marine flatworm Symsagittifera roscoffensis in petri dishes and found its circular swimming, a type of collective behavior, helps the green algae living within its gut to photosynthesize. In findings published July 25 in Royal Society Open Science, the same team provides proof that these worms behave the same in natural surroundings off the coast of Guernsey.

A.B. Sendova-Franks et al., “Plant–animal worms round themselves up in circular mills on the beach,” Royal Society Open Science, doi:10.1098/rsos.180665, 2018.