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Syconoid sponges are similar to asconoids. They have a tubular body with a single osculum, but the body wall is thicker and more complex than that of asconoids and contains choanocyte-lined radial canals that empty into the spongocoel.
- What is the function of Syconoid?
- What are asconoid Syconoid and Leuconoid?
- What is Syconoid canal system?
- What is Leuconoid?
- What do Pinacocytes do in sponges?
- How do Syconoid sponges feed?
- What do Porocytes do?
- What is the role of Archaeocytes?
- Where are Archaeocytes found?
- What is the most efficient canal system?
- What is the simplest type of canal system?
- What does Gemmule mean?
- What is the Osculum in a sponge?
- Is Demospongiae an Asconoid?
What is the function of Syconoid?
In most syconoid sponges (e.g., Scypha) the radial canals are bordered by incurrent canals through which passes the water entering the pores; other openings (prosopyles) allow water into the choanocytes, from which it passes directly into the internal cavity and out of it through the osculum.
What are asconoid Syconoid and Leuconoid?
Asconoid sponges have the simplest type of organization. ... In fact there is quite a variation in complexity in syconoid sponges. In some of these sponges water enters through a canal lined by many cells. Leuconoid sponges are the most complex in design in that not all the chambers are flagellated.
What is Syconoid canal system?
Syconoid type of canal system is the first stage above the asconoid type. • It is formed by the out pushing of the wall of an asconoid sponge at regular intervals into finger like projections, called radial canals.
What is Leuconoid?
The most complex sponge body plan is called leuconoid. In these sponges the canal system forms a more elaborate branched network, and the canals lead to digestive chambers instead of a spongocoel. In leuconoid sponges the choanocytes line the digestive chambers and not the canals.
What do Pinacocytes do in sponges?
Function. Pinacocytes are part of the epithelium in sponges. They play a role in movement (contracting and stretching), cell adhesion, signaling, phagocytosis, and polarity. Pinacocytes are filled with mesohyl which is a gel like substance that helps maintain the shape and structure of the sponge.
How do Syconoid sponges feed?
Water enters through a large number of dermal ostia into incurrent canals and then filters through tiny openings called prosopyles into the radial canals. There food is ingested by the choanocytes. Syconoids do not usually form highly branched colonies as asconoids do.
What do Porocytes do?
Porocytes control the amount of water that enters pores into the spongocoel, while choanocytes, which are flagellated cells, aid the movement of water through the sponge, thereby helping the sponge to trap and ingest food particles.
What is the role of Archaeocytes?
Archaeocytes (or amoebocytes) have many functions; they are totipotent cells that can transform into sclerocytes, spongocytes, or collencytes. They also have a role in nutrient transport and sexual reproduction.
Where are Archaeocytes found?
Archaeocytes (from Greek archaios "beginning" and kytos "hollow vessel") or amoebocytes are amoeboid cells found in sponges. They are totipotent and have varied functions depending on the species.
What is the most efficient canal system?
The syconoid canal system is therefore more efficient than the asconoid type and the leuconoid type is the most efficient.
What is the simplest type of canal system?
A) Asconoid canal system: This is the simplest form of canal system present in Leucosolenia - like asconoid sponges. This is the only canal structure in which choanocytes are coated with spongocoel. Cells called podocytes are expressed by the ostia. Within them, these cells have an intracellular canal.
What does Gemmule mean?
Gemmules are internal buds found in sponges and are involved in asexual reproduction. It is an asexually reproduced mass of cells, that is capable of developing into a new organism i.e., an adult sponge.
What is the Osculum in a sponge?
The osculum (plural "oscula") is an excretory structure in the living sponge, a large opening to the outside through which the current of water exits after passing through the spongocoel. Wastes diffuse into the water and the water is pumped through the osculum carrying away with it the sponge's wastes.
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.
