Reproductive biologists can have a hard time figuring out how sperm reach eggs when females of some species store the sperm for later use. Now, researchers have caught a female Japanese pygmy squid (Idiosepius paradoxus) in the act. The squid inseminates her eggs one at a time using very little sperm. She cradles an egg in the arm crown from which her arms extend and attaches the egg to a surface, such as seagrass, then fertilizes it by placing her sperm-storage organ over it. The scientists published their observations in Current Biology on January 21.
Y. Iwata et al., “How female squid inseminate their eggs with stored sperm,” Current Biology, doi:10.1016/j.cub.2018.12.010, 2019.