[[File:Shark egg case video, Bristol Aquarium, Nov 2014.ogv|thumb|Embryo active inside egg case.]]
An '''egg case''' or '''egg capsule''' is the casing that surroundsurrounds the [[egg (biology)|egg]]s of [[Oviparity|oviparous]] [[shark]]s, [[Skate (fish)|skate]]s, and [[chimaera]]s. Egg cases typically contain one embryo, except for [[big skate]] and [[mottled skate]] egg cases, which contain up to 7 embryos.<ref name="Ebert" /> Oviparity is completely absent in the superorder [[Squalomorphii]].<ref name=":1" /><ref name="1st ed" />