American toad American toad The American toad ("Anaxyrus americanus") is a common species of toad found throughout the eastern United States and Canada. It is divided into three subspecies—the eastern American toad ("A. a. americanus"), the dwarf American toad ("A. a. charlesmithi"), and the rare Hudson Bay toad ("A. a. copei"). Recent taxonomic treatments place this species in the genus "Anaxyrus" instead of "Bufo". The eggs of the American toad are laid in two strings and can hatch in 2–14 days. When hatched the tadpoles are recognizable by their skinny tails in relation to the size of their black bodies. They may
Crustacean larva an "alima" larva, while in Gonodactyloidea, a "pseudozoea" develops into an "erichthus". A single fossil stomatopod larva has been discovered, in the Upper Jurassic Solnhofen lithographic limestone. The life cycle of krill is relatively well understood, although there are minor variations in detail from species to species. After hatching, the larvae go through several stages called "nauplius", "pseudometanauplius", "metanauplius", "calyptopsis" and "furcilia" stages, each of which is sub-divided into several sub-stages. The "pseudometanauplius" stage is exclusive to the so-called "sac-spawners". Until the "metanauplius" stage, the larvae are reliant on the yolk reserves, but from the "calyptopsis" stage, they begin to