It takes guts for a sea spider to pump blood
These arthropods’ unusual digestive system can act like a heart and gills
![sea spider](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/01/011117_SM_sea-spider_main.jpg?fit=860%2C460&ssl=1)
LEGGY MULTITASKERS The skinny legs of sea spiders (one shown from Antarctica) hold guts that digest food and help pump blood.
Timothy Dwyer (PolarTREC 2016), Courtesy of ARCUS