The American lobster, lobster of the north or lobster of Maine (Homarus americanus) are a crustacean decápodo of the Nephronidae family. They live generally in dark waters and you cold, in where there are rocks and other places that allow to hide themselves them of their pregivers. These lobsters are peculiar and solitary. They live a complex life on nocturos habits, where they leave to explore in search of food. Found throughout the coast of the United States. Generally they are associated with waters you cold more of the marine coast of Canada, Maine, Newfoundland and Farmer, in where they grow until enormous statures. Their measures oscillate between the 20 and 60 cm in length and weigh generally between 0.5 and 4 kg, but have been species of more than 1 meter in length and 16 kilos of weight. The natural pregiver of the lobster is the codfish and other fish like the codfish and even greater lobsters. The dumb lobster its shell several times during its youth, but only once or less to the year when it is in his maturity (near the 4 years). When one is near the period of dumb, it begins to grow underneath the shell the reemplazante. The rejected shell is put very hard and dark, beginning to cover itself with black marks that shine like scratches. The central line that crosses the shell of the lobster begins to separate and to divide itself in two parts, that soon fall. The pliers and tail still must be cleared from the old shell, being new the very smooth one. While the new shell is smooth, during the two first weeks after dumb, the lobsters they are very vulnerable, as much that they cannot move quickly to defend itself with his clamps. They even can be imprisoned for other lobsters, specially for the females of the species when eggs are incubating, period during which they are put very defensive. The eggs are green and very small, of around 1mm of diameter. They are transported by the mother inside the tail by a period near the month, after as they are dismissed and they are born. The number of eggs that can take a female can vary from ten to more than thousands, but the rate of survival is very low, around the 0.1 percent.

Cycliophora

is the only species of its sort discovered in 1995 by Reinhardt Kristensen and Peter Funch in the mouth of Nephrops norvegicus. East edge for him was created, but it is not known very well where to place it. Morphologically it is resembled Ectoprocta and Entoprocta, but anatónicas similarities with Gnathifera have been discovered.