Horseshoe crabs are arthropods with many appendages each having claws. Like other invertebrates insects and crabs they originate from kingdom animalia and division arthropoda. Horseshoe crabs are considered being untrue crabs and are closely related to scorpions and others with jointed legs like scorpions (Solomon et al, p.573)
Environmental Characteristics
Horseshoe crabs live in water in, oceans and seas. Horseshoe crabs have gills which they use for gaseous exchange. The crabs have six gills with about one hundred gill books on each. In ware, the water passes over the gill books. The gill filaments are able absorbs the dissolved oxygen present ...
