![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
Sulikowski Shark and Fish Conservation Lab - Blue shark baby! Blue shark (Prionace glauca) are viviparous, with a yolk-sac placenta. In this form of reproduction the mother and baby have a direct
![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
![Shark Devocean on Twitter: "#Deepsea dogfish give birth to live young and nourish their embryos from a yolk sac. Baby longnose velvet dogfish. #shark #lecithotrophy https://t.co/Ho5k0UImvN" / Twitter Shark Devocean on Twitter: "#Deepsea dogfish give birth to live young and nourish their embryos from a yolk sac. Baby longnose velvet dogfish. #shark #lecithotrophy https://t.co/Ho5k0UImvN" / Twitter](https://pbs.twimg.com/media/C-QQYFmXkAEMs6G.jpg)
Shark Devocean on Twitter: "#Deepsea dogfish give birth to live young and nourish their embryos from a yolk sac. Baby longnose velvet dogfish. #shark #lecithotrophy https://t.co/Ho5k0UImvN" / Twitter
![Gareth Fraser on Twitter: "It's Easter, so here's a baby #shark (small spotted catshark; Scyliorhinus canicula) still attached to the yolk sac, with external gills visible. These egg laying sharks emerge from Gareth Fraser on Twitter: "It's Easter, so here's a baby #shark (small spotted catshark; Scyliorhinus canicula) still attached to the yolk sac, with external gills visible. These egg laying sharks emerge from](https://pbs.twimg.com/media/EVaHjsJX0AElght.jpg)
Gareth Fraser on Twitter: "It's Easter, so here's a baby #shark (small spotted catshark; Scyliorhinus canicula) still attached to the yolk sac, with external gills visible. These egg laying sharks emerge from
![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)
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
![Empty Egg Sac | Whitespotted Bamboo Shark (Chiloscyliium plagiosum) | Japan | Tony Wu Underwater Photography Empty Egg Sac | Whitespotted Bamboo Shark (Chiloscyliium plagiosum) | Japan | Tony Wu Underwater Photography](https://stockphotos.tonywublog.com/img-get/I0000WW8b9sB4OSI/s/1200/I0000WW8b9sB4OSI.jpg)