TRIPLEWART SEADEVIL (newly hatched female in yolk sac)
©Norbert Wu Productions more pix here
The triplewart seadevil is a seadevil of the family Ceratiidae, found in all oceans, from the surface to 2,000 m. Its length is approximately 12”/30 cm for females and 2”/3 cm for males. They belong to the anglerfish family.
The species displays extreme sexual dimorphism. Females are more typical in appearance to other anglerfish, whereas the males are tiny rudimentary creatures with stunted digestive systems. A male must find a female and attach to her near the vent; he then lives on her parasitically, becoming little more than a sperm-producing appendage. Source
Thanks to @heelshats-n-ties for the recommendation!
Anglerfish with attached males