![Chuck "Charles" Bangley, PhD on Twitter: "Spiny dogfish practice a form of live birth called yolk sac viviparity. The terminology has changed around a bit, but the general idea is that these Chuck "Charles" Bangley, PhD on Twitter: "Spiny dogfish practice a form of live birth called yolk sac viviparity. The terminology has changed around a bit, but the general idea is that these](https://pbs.twimg.com/media/EwEDof9XcAsDeMo.jpg)
Chuck "Charles" Bangley, PhD on Twitter: "Spiny dogfish practice a form of live birth called yolk sac viviparity. The terminology has changed around a bit, but the general idea is that these
![Animals | Free Full-Text | Reproductive Anatomy of Chondrichthyans: Notes on Specimen Handling and Sperm Extraction. II. Sharks and Chimaeras Animals | Free Full-Text | Reproductive Anatomy of Chondrichthyans: Notes on Specimen Handling and Sperm Extraction. II. Sharks and Chimaeras](https://www.mdpi.com/animals/animals-11-02191/article_deploy/html/images/animals-11-02191-g006.png)
Animals | Free Full-Text | Reproductive Anatomy of Chondrichthyans: Notes on Specimen Handling and Sperm Extraction. II. Sharks and Chimaeras
![PDF] Group courtship, mating behaviour and siphon sac function in the whitetip reef shark, Triaenodon obesus | Semantic Scholar PDF] Group courtship, mating behaviour and siphon sac function in the whitetip reef shark, Triaenodon obesus | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/7bc72d15689daabe786a70aabbd0fd6dfdd1d1ec/3-Figure2-1.png)
PDF] Group courtship, mating behaviour and siphon sac function in the whitetip reef shark, Triaenodon obesus | Semantic Scholar
![Skate egg sacs . . . commonly known as Mermaid's Purses . . . found in Laguna Beach (west end of PCB) | Mermaid purse, Underwater images, Shark week Skate egg sacs . . . commonly known as Mermaid's Purses . . . found in Laguna Beach (west end of PCB) | Mermaid purse, Underwater images, Shark week](https://i.pinimg.com/originals/74/1d/0c/741d0cb2ebe272a19c52c2d33fce1443.jpg)
Skate egg sacs . . . commonly known as Mermaid's Purses . . . found in Laguna Beach (west end of PCB) | Mermaid purse, Underwater images, Shark week
![LSU Museum of NatSci on Twitter: "(3/4) Some sharks are oviparous and lay eggs affectionately called mermaid purses (top of photo). Using the long strings attached to them they can wrap it LSU Museum of NatSci on Twitter: "(3/4) Some sharks are oviparous and lay eggs affectionately called mermaid purses (top of photo). Using the long strings attached to them they can wrap it](https://pbs.twimg.com/media/DjDbEzjUwAEknwi.jpg)