What is the difference between Asconoid and Syconoid sponges?
What is the difference between Asconoid and Syconoid sponges?
Asconoid sponges have the simplest type of organization. Syconoid sponges appear to be larger versions (with more infoldings) of asconoids, still having just a single osculum. However, the body wall is generally thicker and more complex with incurrent canals rather than simple pores.
What is Asconoid canal system?
The asconoid type of canal system is considered the simplest and most primitive type of canal system. It is the only canal system in which choanocytes are lined with spongocoel. Cells called porocytes are expressed by the ostia. Within them, these cells have an intracellular canal.
What is the difference between the Asconoid body plan and the Syconoid body plan?
The main difference between asconoid and syconoid body plans is that syconoid sponges have a row of tiny chambers, called radial canals, within their tissue that house their choanocytes.
What is Syconoid type of 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 body type do these porifera have?
Body types: Sponges have three body types: asconoid, syconoid, and leuconoid. Asconoid sponges are tubular with a central shaft called the spongocoel. The beating of choanocyte flagella force water into the spongocoel through pores in the body wall. Choanocytes line the spongocoel and filter nutrients out of the water.
What is the most efficient canal system?
As the canal system becomes more complex, the number of flagellated cells increases and the force to draw water current is increased. The syconoid canal system is therefore more efficient than the asconoid type and the leuconoid type is the most efficient.
Which is the most efficient canal system?
Which is the simplest canal system?
The simplest type of canal system found in Sponges is Ascon type. Sycon type and leucon type of canal systems are advanced canal systems which are produced by folding in the body wall of ascon type of sponges.
Do sponges have a nervous system?
Sponges are among the most primitive of all animals. They are immobile, and live by filtering detritus from the water. They have no brains or, for that matter, any neurons, organs or even tissues.
Why is it called porifera?
The name porifera means ‘pore bearer’ in Latin (a pore is a tiny hole). A sponge’s body is covered by a skin, one cell thick.
Why is Leuconoid most efficient?
The sponges have evolved in their body structure and three types of canal systems are found in sponges. The leuconoid organization is considered the most complex type of body plan for sponges as it permits greater size and allows more efficient water circulation.
Where water canal system is found?
Phylum Porifera members also known as sponged have a water transport or canal system. Water enters through the minute pores of sponges called ostia in the body wall into a central cavity called spongocoel, from where it goes out through the osculum.
What does asconoid, syconoid and leuconoid mean?
(redirected from Asconoid, syconoid, and leuconoid.) Also found in: Dictionary, Thesaurus, Medical . [Lat.,=pore bearer], animal phylum consisting of the organisms commonly called sponges.
Which is better a syconoid or a leuconoid canal system?
The main advancement of leuconoid canal system over that of syconoid type of canal system is due to: (i) The limitation of choanocytes only to the small chambers, (iii) The elaboration and complication of the incurrent and excurrent water passages.
Which is the first step above the asconoid canal system?
The first step above the asconoid type of canal system is represented by the syconoid type of canal system. The complication is due to the out-pushing of the wall into finger-like projections, called the radial canals, at regular intervals. In this type of canal system, choanocytes are only limited to the radial canals.
What kind of sponge has a syconoid canal system?
The Syconoid (Stage III) canal system is found in many genera of calcareous sponges, viz., Grantia, Grantiopsis, Heteropia, Ute, etc. The complication is due to the spreading of the dermal membrane (consisting of epidermis plus a thin layer of mesenchyme) over the entire surface of the sponges to form the cortex of variable thickness.