What Exactly is: Mermaid's Purse and Why it Looks so Weird

You might have seen mermaid's purse randomly while strolling on the beach, or perhaps saw it on the internet. It's actually quite a unique traits in the animal kingdom. You should return it to the sea if possible.
0:00 Opening thought
0:35 What is mermaid’s purse
2:09 Morphotypes of mermaid’s purse
5:38 Reasons behind the peculiar shape
7:14 Closing thought
References
Fischer, J., Licht, M., Kriwet, J., et al. (2014). Egg capsule morphology provides new information about the interrelationships of chondrichthyan fishes. Journal of Systematic Palaeontology, 12,3: 389-399. dx.doi.org/10.1080/14772019.2012.762061.
Ebert, D.A. & Davis, C.D. (2007). Descriptions of skate egg cases (Chondrichthyes: Rajiformes: Rajoidei) from the eastern North Pacific. Zootaxa, 1393: 1-18.
Caruso, J., & Bor, P.H. (2007). Egg capsule morphology of Parascyllium variolatum (Duméril, 1853) (Chondrichthyes; Parascylliidae), with notes on oviposition rate in captivity. Journal of Fish Biology, 70, 1620-1625.
O'Neill, H.L., Avila, C., & White, W.T. (2020). Description of the egg cases and juvenile colouration in two catsharks of the genus Atelomycterus (Carcharhiniformes: Scyliorhinidae). J Fish Biol; 97: 1724-1732. doi.org/10.1111/jfb.14536.
Mancusi, C., Massi, D., Baino, R., et al. (2021). An identification key for Chondrichthyes egg cases of the Mediterranean and Black Sea. The European Zoological Journal, 88, 1: 436-448. DOI: 10.1080/24750263.2020.1862926.
Outro:
Bubbles Drifting in the Morning Breeze - Artificial.Music & Akosmo
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[@maxnum1sgameclub263]

These are shark/ray eggs ^^. Zoo’s and aquaria often have them on display once they are hatched. They are pretty cool tbf.

[@shamaniccolonic777]

This is the kinda content I've been longing for, you're awesome!🦌 I especially appreciated the hydration prompt lol. These are sort of like aquatic e-seeds 🤔

[@Itz_tocabocagirl]

I went to the beach, and there were loads of them! Sadly one of them where open and one of the skates weren’t okay ):. (As a future marine biologist I go to the becah a lot XD)

[@OutofPlaceZoologist]

That's unfortunate.
But hey, good luck on your journey of becoming a marine biologist