What is Rhagon type of canal system?
Rhagon type, with conical shape and broad base Canal system in sponge body is a system of characteristic criss-crossing canals (water channels) for water flow that communicate to exterior through numerous apertures, the ostia and osculum. It is a characteristic feature of poriferans.
What are rhagons?
Definition of rhagon 1 : leucon. 2 : a sponge or sponge larva of leuconoid structure in which the flagellated chambers are few in number and often adjoin the paragaster.
What is Leucon type canal system?
Leucon type or Leuconoid canal system: It is the most complicated canal system. It develops from syconoid type due to folding of walls of radial canals. This type of canal system is found in leuconoid sponges. The radial symmetry of body is lost and thus, the canal system becomes very irregular.
What is asconoid canal system?
The Asconoid type of canal system is the simplest type of canal system and is found in Lecuosolenia and other Homocoela. In this type of canal system, ostia are present on the surface of the body and connected to the spongocoel. It is lined by flagellated choanocyte cells.
What is the difference between ascon sycon and leucon?
Sycon sponges are are more complex than ascon sponges but are simpler than leucon sponges. These sponges have multiple dermal pores, where water enters the sponge, and only have one osculum. The openings lead to radial canals that are lined with choanocytes and after they lead to the spongocoel.
What is sycon type canal system?
Sycon type of canal system is more complex compared to the ascon type. Both these canals blindly end into the body wall but are interconnected by minute pores. Incurrent pores also known as dermal ostia are found on the outer surface of the body. These incurrent pores open into incurrent canals.
What is the difference between ascon sycon and Leucon?
What is ascon type of canal system?
Hint: Asconoid is the simplest type canal system found in sponges. This type of canal system is also called the ascon type. This canal system of sponges helps in food acquisition, respiratory gas exchange and in excretion too. d) Leucosolenia has the asconoid type canal system as it is a sponge.
Is Demospongiae an asconoid?
They are small, usually vase shaped and asconoid, syconoid, or leuconoid in structure. Glass sponges (Clade or Class Hexactinellida) are mostly deep sea forms. Clade (Class) Demospongiae contains most of the sponge species. Spicules are siliceous, but not six-rayed.
How do you identify Demospongiae?
Members of Demospongiae are easily distinguished from those of the Hexactinellida because they have no six-rayed spicules. They possess a leuconoid structure, with a folded choanoderm . The pinacoderm is continuous, and the mesohyl is characteristically thickened.
Is Hexactinellida an asconoid?
They are small, usually vase shaped and asconoid, syconoid, or leuconoid in structure. Glass sponges (Clade or Class Hexactinellida) are mostly deep sea forms. Spicules are six-rayed and made of silica. Hexactinellids lack a pinacoderm or gelatinous mesohyll.
What species is Demospongiae?
Demosponges (Class Demospongiae) are the most diverse class in the phylum Porifera. They include 76.2% of all species of sponges with nearly 8,800 species worldwide (World Porifera Database).