How are sponges and cnidarians different?

Sponges have multiple cell types that are geared toward executing various metabolic functions. Cnidarians have outer and inner tissue layers sandwiching a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion.

What are Excurrent pores?

adjective. zoology having an outward flow, as certain pores in sponges, ducts, etc. botany. (of veins) extending beyond the margin of the leaf.

What is the name of the Excurrent pores in sponge?

The essential elements of the water-current system include the pores, or ostia, through which water enters the sponge (incurrent system); the choanocytes, or collar cells, which are flagellated cells that generate water currents and capture food; and the oscula, openings through which water is expelled (excurrent …

Which characteristic do sponges and cnidarians share?

The characteristic shared by all of these species is that their gonads are derived from epidermal tissue, whereas in all other cnidarians, they are derived from gastrodermal tissue (Figure 15.2.

What is the difference between asconoid Syconoid and Leuconoid sponges?

During their development, syconoid sponges pass through an asconoid stage. Leuconoid sponges lack a spongocoel and instead have flagellated chambers, containing choanocytes, which are led to and out of via canals. Physiology: Sponges have no real circulatory system, however the water current is used for circulation.

What is the function of pores in sponges?

In addition to the osculum, sponges have multiple pores called ostia on their bodies that allow water to enter the sponge. In some sponges, ostia are formed by porocytes: single, tube-shaped cells that act as valves to regulate the flow of water into the spongocoel.

What is Prosopyle and Apopyle?

Water enters the sponge through these pores and moves into the incurrent canal. Water leaves this area to enter the. radial canal (area of choanocytes) via the prosopyle – (a porocyte cell) Water leaves the area of choanocytes via a much larger pore, made by many cells = the apopyle.

What is the relationship between sponges and Cnidaria?

Sponges vs Cnidarians One interesting difference between sponges and cnidarians is that sponges lack tissue while cnidarians have tissues but not the organ systems. Sponges and Cnidarians are very primitive acoelomic invertebrates with very simple body structures. Both organisms are found in aquatic ecosystems.

How are animals of Porifera different from those of Cnidaria?

Animals of the phylum Porifera have an asymmetrical body with the cellular level of body organisation, whereas cnidarians have radial symmetry and tissue level of body organisation. Cnidarians have nematocysts, whereas poriferans have choanocytes performing different functions.

What characteristic do all cnidarians have in common?

Cnidarians share several basic characteristics. All Cnidaria are aquatic, mostly marine, organisms. They all have tentacles with stinging cells called nematocysts that they use to capture food. Cnidarians only have two body layers, the ectoderm and endoderm, separated by a jelly-like layer called the mesoglea.