The stone canal extends downwards (orally) and opens into a ring canal, around the mouth. Fill in the following classification scheme for the Sea Star, Sea Urchin, & Sea Cucumber. Allows for exit of waste. Where water enters the water vascular system. : 957. Stone canal definition, (in certain echinoderms) a tube lined with calcareous deposits, connecting the madreporite with a circular canal around the mouth. o Pyloric Caeca- secretory gland to aid digestion. Source for information on stone canal: A Dictionary of Zoology dictionary. Label: • gonads . Genus Species 2. Madreporite, stone canal, ring canal, radial canal, ampullae, tube feet . With the starfish's aboral surface facing you, cut off the tip of a ray. Starfish have separate sexes, testes are grey in colour and ovaries are orange. Ask for details ; Follow Report by Harish5129 16.03.2019 Log in to add a comment The stone canal runs upwards to the ring canal, typically located in a circular depression on the upper (i.e. Cut along lines a, b, and c and then remove this flap of skin. o Stone Canal- place were water enters and goes to the ring canal. Water Vascular System. A B C . Connects madreporite to ring canal. Connects stone and radial canals; carries water from the stone canal to the radial canal.
The lumen of stone canal is lined by very tall flagellated cells. ... 10. The water vascular system consists of hollow tubes to circulate sea water around the sea star. A short, canal called the stone canal leads from the ring canal to the madreporite where water enters. Stone canal. internal) surface of the jaws. The ring canal has four polian vesicles. Ophiuroids have no ambulacral groove, and the radial canals instead run through the solid bone-like ossicles of the arms. Anus. Madreporite. stone canal In Echinodermata, a canal with walls strengthened by calcareous matter that connects the madreporite with the water-vascular system. Write the function of Stone canal of Starfish. o Ampullae- contracts and the water is forced out the tube foot to move the starfish. o Esophagus-External Anatomy o Madreporic Plate- pumps water into the starfish. The walls of stone canal are supported by a series of calcareous ringd. Water Vascular System . Ring canal. Preserving starfish specimens may cause them to lose their true colours. Centre of the starfish where the rays meet. o Ring or Circular Canal- were water is distributed into each arm. Sea water enters through the madreoporite and moves by way of canals to all body parts.