What are the body structures of porifera?

What are the body structures of porifera?

Many sponges have internal skeletons of spongin and/or spicules of calcium carbonate or silica. Primarily, their body consists of a thin sheet of cells over a frame (skeleton). As their name suggests, Poriferans are characterized by the presence of minute pores called ostia on their body.

What are the 3 body types for porifera?

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.

How do porifera support their bodies?

They are supported by a skeleton made up of the protein collagen and spicules, which may be calcareous or siliceous, depending on the group of sponges examined. Skeletal elements, choanocytes, and other cells are imbedded in a gelatinous matrix called mesohyl or mesoglea.

What is the body wall of porifera?

The body wall of a sponge i.e. Porifera consists of two layers, the outer layer is called pinacoderm and the inner layer is called choanoderm, with non-cellular mesenchyme in between. It is the interconnecting proteinaceous gelatinous matrix.

Which is the most specific feature of sponges?

Sponges differ from other animal phyla by their unique possession of 5 distinct features.

• Choanocytes.
• Water canal (aquiferous) system.
• Organic and inorganic skeletons.
• Totipotency. Plasticity.

What kind of body structure does sponge have?

A sponge’s body is hollow and is held in shape by the mesohyl, a jelly-like substance made mainly of collagen and reinforced by a dense network of fibers also made of collagen. The inner surface is covered with choanocytes, cells with cylindrical or conical collars surrounding one flagellum per choanocyte.

Which is a feature of the sponge’s body?

A sponge’s body is covered by a skin, one cell thick. This skin has lots of small pores and a few large openings. The small openings are the entrances to a complex system of channels. The channels lead to inner chambers lined with specialized feeding cells called choanocytes or collar cells.

How does porifera relate to the structure of a sponge?

Porifera originates from two words called Porous = having holes and fer = bearing. Body of sponge is diploblastic, which surrounds a ‘spongocoel’ and the body is perforated by innumerable incoming pores called ostia. There are one/more larger pore called osculum through which water is thrown out of spongocoel.

What are the features of a sponge?

What are the physical features of a sponge?

Physical characteristics: Freshwater sponges are crustlike, branched, or clumped. The texture is fragile and soft, and the color is whitish or green. Freshwater sponges have irregularly scattered and barely visible water-exit holes. The surface is uneven and roughened by spicules.

What are the distinguishing characteristics of Porifera?

Characteristic Features of Phylum Porifera. They are generally marine aquatic organisms, with a few freshwater species. Their bodies are asymmetrical. Body shape can be cylindrical, vase-like, rounded or sac-like. They are diploblastic animals with two layers, the outer dermal layer and the inner gastral layer.

What are five examples of phylum Porifera?

Some of the common Porifera examples are: Sycon. These are solitary or colonial marine sponges found in shallow waters attached to the rocks. The body is cylindrical in shape with numerous Hylonema. Cliona. Euplectella. Spongilla.

What type of body cavity does Porifera have?

There are following characteristics of the phylum Porifera: Their bodies consist of loosely organized cells. They vary in size from less than a centimeter to a mass that can fill your arm. They are asymmetrical or radially symmetrical. They have three cell types: pinacocytes, mesenchyma cells, and choanocytes. They have central cavity or spongocoel.

What are the major classes of Porifera phyla?

The following points highlight the three main classes of Phylum Porifera. The three classes are: 1. Calcarea or Calcispongiae – (Calcareous Sponges) 2. Hexactinellida or Triaxonida or Hyalospongiae-(Glass Sponge) 3. Demospongiae.