How do Japanese Spider crabs reproduce?

Answer 1

In general, Spiders mate and the female lays eggs, which she "hides" in an egg sac. The female actually stores the sperm of the male until she is "ready" to lay the eggs. In a number of different species of spider, the female will kill and eat the male, which is considerably smaller, following mating. The eggs later hatch and the young are on their own. Some young spiders might "hang around" the web of the mother, if she is that kind of spider (the black widow is an example). But though she protects them in her web, the young (which are fully formed and capable) must eventually leave to make their own way - without any more assistance from their mother. Wikipedia has a great article on the spider, and a link to the portion of it that deals with reproduction is provided. Why not surf on over, read the short piece and become an expert?

Answer 2

Spider crabs reproduce when females lay huge clutches of eggs. Males then fertilize these clutches and the eggs are abandoned, leaving the young to fend for themselves.