This form includes verbal or speech developmental apraxia, perhaps the most common form of the disorder. Constructional apraxia affects the person's ability to draw or copy simple diagrams or to construct simple figures. Oculomotor apraxia is a condition in which patients find it difficult to move their eyes.
Medium ones about the size of a golf ball may molt every four to six months and stay buried for about one to three months. The smaller hermit crabs may molt as often every month or even every few weeks for the tiniest ones, and may stay buried to do it for only a couple of weeks or months.
Enzymes are produced and secreted in order to separate the exoskeleton. The crab also pulls and wiggles around inside the shell to encourage separation. About 24 hours before actually molting, the crab takes in a great deal of water in order to swell up and split a seam that runs along the side of the body. Once the seam has split, the crab merely crawls out. This aspect of molting takes about fifteen minutes.