Reproduction 200px|right|thumb| Female scorpion Vaejovis cashi carrying its young (white) Horseshoe crabs use external fertilization; the sperm and ova meet outside the parents' bodies. Despite being aquatic, they spawn on land in the intertidal zone on the beach. The female digs a depression in the wet sand, where she will release her eggs. The male, usually more than one, then releases his sperm onto them. Their trilobite-like larvae look rather like miniature adults as they have full sets of appendages and eyes, but initially they have only two pairs of book-gills and gain three more pairs as they molt.
Reproduction 200px|right|thumb| Female scorpion Vaejovis cashi carrying ,it,s young (white) Horseshoe crabs use ex.ternal fertilization; the sperm and ova meet outside the parents' bodies. Despite being aquatic they spawn on land in the intertidal zone on the beach. The female digs a depression in the wet sand where she will release her eggs. The male, usually more than one, then releases his sperm onto them. Their trilobite-like larvae look rather like miniature adults as they have full sets of appendages and eyes, but initially they have only two pairs of book-gills and gain three more pairs as they molt