http://creationwiki.org/Horseshoe_crab

Jan 20, 2012 ... Horseshoe crabs breathe with five sets of "book lungs" that are located on the ventral side of its body. Book lungs act as gills when the ...

https://coast.noaa.gov/data/estuaries/pdf/hooray-for-horseshoe-crabs-student-master-1.pdf

Like other crabs, horseshoe crabs are arthropods. But so are spiders ... Like many other aquatic animals, horseshoe crabs breathe through gills. They have six ...

https://www.stlzoo.org/visit/thingstoseeanddo/stingraysatcaribbeancove/horseshoecrabfacts

Their second body section is their abdomen, and it contains five sets of book gills -- flap-like structures that allow the horseshoe crab to breath under water.

https://janicepetrie.com/the-horseshoe-crab-anatomically-speaking/

C. Telson: This is the horseshoe crab's tail, used to help the horseshoe crab ... to breath; and by flapping its gills, the horseshoe crab propels itself through the ...

https://www.aqua.org/Experience/Animal-Index/horseshoe-crab

It has six pairs of jointed legs and six leather-like flaps, called book gills, which are used for breathing and swimming. The horseshoe crab's brain is located in a  ...

http://www.edc.uri.edu/restoration/html/gallery/invert/shoe.htm

Horseshoe crabs are not true crabs as their name suggests. ... leaves of paper, which the horseshoe crab uses for breathing and for moving when upside down.

http://www.pbs.org/wnet/nature/crash-a-tale-of-two-species-horseshoe-crab-anatomy/593/

Mar 13, 2011 ... When you first look at a horseshoe crab, chances are the first thing ... The book gills are versatile organs used not only to breathe but also for ...

http://marinebio.org/species.asp?id=281

A protein found in the blood of horseshoe crabs is used to detect impurities in ... the operculum, protects the other five pairs, which are respiratory organs and ...

https://sites.google.com/site/horseshoecrabrbhs/respiration

Book gills are used for both swimming and breathing. They are covered in a membrane that allows oxygen to enter, but repels water. The first of the six pairs is ...

https://www.nwf.org/Educational-Resources/Wildlife-Guide/Invertebrates/Horseshoe-Crab

The spines are movable and help protect the horseshoe crab. On the underside of the abdomen are muscles, used for movement, and gills for breathing.