Cranchid or “glass” squid are a deep sea family distinguished by completely transparent bodies,camouflage for a life in open water at perpetually dark depths.Some species protect themselves by inflating like a balloon,swelling up into un-swallowable spheres.Same tactic blowfish are famous for,& it’s not all they have in common;some species,like this Cranchia scabra,also covered in sharp,tooth-like protrusions.May also pull their entire head & all of their tentacles inside of their body..
"Females of this unusual octopus species sequester themselves in thin, translucent shells with which they drift across the open seas. Paper nautiluses, also called argonauts, secrete the shells to serve as cases for their eggs—but it has recently been discovered that they also function as air-trapping ballast tanks, which allow the cephalopods to hang effortlessly in the water column without sinking. Clever octopodes!"
This half inch long sea spider is an amazing form of life. It has no lungs or gills, transmitting gasses directly through it's slender exoskeleton. The digestive tract extends down it's legs and is clearly visible here as snaky, colored tubes inside the transparent exoskeleton. This specimen is on fire coral in 30 feet of water in Grand Cayman. Sea Spiders are found in all oceans and at least one species can get up to 2 feet long in some deep sea areas.
Bigfin reef squid use their bioluminescence skills to both communicate and camouflage. Male reef squid have the ability to change multiple colors simultaneously–while protecting a female mate who is laying eggs on the seafloor, the male’s underside is a calm white color while his upper body flashes angry warning colors to potential predators. | Cephalopod of the Order: Teuthida
The slender snipe eel or deep sea duck has more vertebrae in its body than any other animal (around 750), but what makes it truly bizarre is that its anus moved forward during evolution and is now located on its throat.
HEART SORTA ON SLEEVE This so-called glass frog’s transparent body lacks pigmentation and reveals its organs in action—including a beating heart. More than 150 species of glass frogs are found in rain forest trees across Central and South America. (Photo: Paul Hamilton / RAEI via National Geographic)
Vitrelladonella richardi ( no common name as yet) - An incredibly rare, deep-sea translucent octopus - Image : Underseahunter Group - site has a 4 min 36 sec clip; octopus enters at 2 min and exits at 3 min 51 sec