"Post-spawning care of nonbrooded embryos in the #Colossendeidae is an exciting finding..it may represent an evolutionarily intermediate strategy between free-spawning & the #paternal brooding exhibited by most other groups of sea spiders..mating stacks of more than two individuals also raise interesting questions about the potential for male competition for #fertilization..more detailed observations & identification of the sex of individuals in mating groups are needed"

https://esajournals.onlinelibrary.wiley.com/doi/10.1002/ecy.4258