- When the egg case is first laid, it is soft and pale; the case hardens and darkens in a few hours.
The egg case, when it is first laid is soft and pale.
- The developing embryo receives nutrients from a yolk formed prior to fertilization.
A tiny shark embryo still attached to its yolk.
- Oviparous sharks include horn sharks and swell sharks (Cephaloscyllium ventriosum).
Horn sharks lay spiral egg cases.
- Port Jackson sharks carry their egg cases in their mouths, possibly to drop them in a hiding spot. This is about the only shark parental care observed by humans.