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Invertebrates
Most osmoconformers are marine invertebrates such as echinoderms (such as starfish), mussels, marine crabs, lobsters, jellyfish, and scallops. Some insects are also osmoconformers.

Chordates
There are a couple of examples of osmoconformers that are chordates such as hagfish, skates and sharks. Their body fluid is isoosmotic with seawater, but their high osmolarity is maintained by making the concentration of organic solutes unnaturally high. Sharks concentrate urea in their body, and since urea denatures proteins at high concentrations, they also accumulate trimethylamine N-oxide (TMAO) to counter the effect. Sharks adjust their internal osmolarity according to the osmolarity of the sea water surrounding them. Rather than ingesting sea water in order to change their internal salinity, sharks are able to absorb sea water directly. This is due to the high concentration of urea kept inside their bodies. This high concentration of urea creates a diffusion gradient which permits the shark to absorb water in order to equalize the concentration difference. The crab-eating frog, or Rana cancrivora, is an example of a vertebrate osmoconformer. The crab-eating frog also regulates its rates of urea retention and excretion, which allows them to survive and maintain their status as osmoconformers in a wide range of external salinities.

Hazon, N., and G. Flik. Osmoregulation and Drinking in Vertebrates. Oxford: BIOS Scientific, 2002. Print.

Gibson, Amelia. Sharks - Osmoregulation. Sharks - Osmoregulation. Web. 20 Mar. 2015.

Saladin, Kenneth S. "Biology Reference." Osmoregulation. N.p., n.d. Web. 08 Apr. 2015.