Desarrollo embrionario del calamar Sepioteuthis sepioidea

https://naturalscienceseducation.wordpress.com/2012/07/02/ilabs-visitor-question-when-do-aquarium-snails-develop-their-shells/https://books.google.com.pe/books?id=F6se5w-Z6uAC&printsec=frontcover&dq=biologia+del+desarrollo&hl=es&sa=X&ei=osRiVYntIYScNuOWgYgM&ved=0CBwQ6AEwAA#v=onepage&q=caracol&f=false