What do Porifera and Placozoa have in common?

1. They have asymmetry, or they’re superficially radially symmetrical. 2. They have 3 cell types (pinacocytes, mesenchyme cells, and choanocytes.)

What is the difference between Porifera and cnidaria?

Porifera are aquatic organisms known as sponges, while cnidarians are for example jellyfishes, corrals, etc. Poriferans are the most simple multicellular animal organisms. They are always sessile while cnidarians may be sessile (the corrals) or free living (jellyfishes).

What makes Porifera different?

Unlike Protozoans, the Poriferans are multicellular. However, unlike higher metazoans, the cells that make up a sponge are not organized into tissues. Therefore, sponges lack true tissues and organs; in addition, they have no body symmetry. Sponges do, however, have specialized cells that perform specific functions.

What exactly are Placozoa?

The Placozoa /plækəˈzoʊə/ are a basal form of marine free-living (non-parasitic) multicellular organism. They are the simplest in structure of all animals.

Do Placozoa have true tissues?

Placozoans (phylum Placozoa) are even simpler than sponges, but they actually have true tissues. They are flat amoeboid organisms with two layers of epithelium, one dorsal and one ventral, and a thin layer of stellate cells.

What are the examples of porifera and coelenterates?

Sycon, Spongilla, and Euspongia are some of the examples of Poriferans. Organisms like Physalia, Adamsia, Pennatula, Gorgonia, and Meandrina are examples of coelenterates. Note: -Coelenterates or cnidarians are found in two body forms – Polyp and Medusa.

What is similar between porifera and Cnidaria?

Porifera and Cnidaria are organisms which share similar characteristics with one another. -They are both multicellular, they consist of many cells working together. They are both eukaryotic, they have DNA in the form of chromosomes contained within a distinct nucleus.

What separates Cnidaria from porifera?

Compare the structural differences between Porifera and Cnidaria. Poriferans do not possess true tissues, whereas cnidarians do have tissues. Because of this difference, poriferans do not have a nerve net or muscle cells for locomotion, which cnidarians have.

What are the 3 types of sponges?

Most sponges fall into one of three categories, based on their canal systems – asconoid, syconoid and leuconoid. Asconoid sponges have the simplest type of organization. Small and tube shaped, water enters the sponge through dermal pores and flows into the atrium.

What are the 3 classes in phylum porifera?

The three classes are: 1. Calcarea or Calcispongiae— (Calcareous Sponges) 2. Hexactinellida or Triaxonida or Hyalospongiae—(Glass Sponge) 3. Demospongiae.

What are 4 interesting facts about phylum Porifera?

Gimme 4 facts about Phylum Porifera. 1. They have asymmetry, or they’re superficially radially symmetrical. 2. They have 3 cell types (pinacocytes, mesenchyme cells, and choanocytes.) 3. They have a central cavity or a series of branching chambers through which water circulates during filter feeding. 4. They have no tissues or organs!!!

What is the main difference between sponges and protozoa?

The main difference between sponges and protozoa is that sponges are marine invertebrates that belong to the phylum Porifera whereas protozoa are a diverse group of unicellular eukaryotes, a subdivision of kingdom Protista.

What is the difference between poriferans and ctenophorians and cnidarians?

Describe the difference between poriferans, ctenophorians and cnidarians in terms of tissue level organization. Poriferans DO NOT have tissue. Ctenophorians and Cnidarians have tissue level organization. How is labor divided in poriferans?

Why are protozoans classified as one-celled animals?

The characteristic features of protozoans including the lacking of a cell wall, mode of motility and predation allow the classification of them as a one-celled animal. Also, protozoans are heterotrophs that live freely or are parasitic on their organic matter.