madreporite造句

• Just underneath the madreporite, is a cup-like depression called the ampulla.
• As the arms grow the disc begins to develop and eventually a madreporite appears.
• The first is called the madreporite.
• Beneath this is a water-filled cavity which contains the madreporite and delicate gill structures known as papullae.
• It is created in larval pairs, with the left axocele developing into a channel between the hydrocele and the madreporite.
• The color of the madreporite is light orange, and it has raised pores that connect to the water vascular system.
• The sieve-like madreporite allows entry of seawater into the stone canal, which connects to the ring canal around the mouth.
• The madreporite is usually located within one of the jaw plates, and not on the upper side of the animal as it is in starfish.
• Its main parts are the madreporite, the stone canal, the ring canal, the radial canals, the lateral canals, and the tube feet.
• At some stage in their development as yet unexplained, only 5 arms and one madreporite appear, and the ability to divide in this way is lost.
• In holothuroids, the podia may be reduced or absent and the madreporite opens into the body cavity so that the circulating liquid is coelomic fluid rather than sea water.
• The animals apparently did not have an anus, but a madreporite was on the upper surface, surrounded by what appear to be genital pores for the release of gametes.
• According to a definition at biology-online . org, a Madreporic Plate ( also called a madreporite ) is a perforated plate in echinoderms, through which water is admitted to the ambulacral tubes.
• At this stage they become radially symmetrical, each one having a single central plate, a madreporite plate, five radial and five interradial plates, and five terminal plates which are the first stage in the development of the arms.