What are the body parts of a sponge?
Parts
- archaeocytes (amoebocytes)
- choanocyte – also called collar cells, choanocytes line the inner cavity of the sponge.
- epidermis (pinacocyte)
- flagellum whip-like structure of a choanocyte;
- mesohyl (mesenchyme) the gelatinous layer between the outer body of the sponge and the spongocoel (the inner cavity).
What are the three types of sponges based on the composition of their spicules?
Sponges are divided into classes based on the type of spicules in their skeleton. The three classes of sponges are bony (Calcarea), glass (Hexactenellida), and spongin (Demospongiae).
How many species of sponge are there?
The approximately 8,550 living sponge species are scientifically classified in the phylum Porifera, which is comprised of four distinct classes: the Demospongiae (the most diverse, containing 90 percent of all living sponges), Hexactinellida (the rare glass sponges), Calcarea (calcareous sponges), and Homoscleromorpha …
What’s the difference between Ostia and porocytes?
Once through the pores, water travels down canals. The opening to a porocyte is a pore known as an ostium. In sponges, like Scypha, there are some cells that have an intracellular pore. These cells are known as porocytes.
What are the three classes of porifera?
The three classes are: 1. Calcarea or Calcispongiae— (Calcareous Sponges) 2. Hexactinellida or Triaxonida or Hyalospongiae—(Glass Sponge) 3. Demospongiae.
What are the five types of sponges?
What are Some Types of Sponge? There are four different types of sponges from different classes: Calcarea, Hexactinellida, Demospongiae, and Sclerospongiae. They are split into the classes based on the type of spicules they have. For example, spicules may be made of calcium carbonate or a spongin fiber.
What are the 4 classes of sponges?
Calcarea, Hexactinellida, Demospongiae, and Homoscleromorpha make up the four classes of sponges; each type is classified based on the presence or composition of its spicules or spongin. Most sponges reproduce sexually; however, some can reproduce through budding and the regeneration of fragments.
What is the difference between an Incurrent canal and a radial canal?
The incurrent canals are non-flagellated as they are lined by pinacocytes and not choanocytes. On the other hand radial canals are flagellated as they are lined by choanocytes. These canals open into the central spongocoel by internal ostia or apopyles.
How do you classify phylum Porifera?
Phylum porifera is classified mainly basing on skeleton. It is divided into 3 classes. sponges spicules plays a very important role in classification of porifera….Order 2 : Heterocoela
- Spongocoel is lined by epithelial cells.
- Choanocytes restricted to radial canals only.
- Leuconoid or Syconoid canal system is seen.
What describes the body plan of a sponge?
Sponge Body Plan Sponges, members of the Porifera phylum, are multicellular organisms with bodies full of the porous channel that causes water molecules to move through them; it is composed of jelly-like mesohyl, which is sandwiched between two thin cell layers.
What are the three types of sponges?
There are three types of sponge body forms: ascon, sycon, and leucon. Ascon sponges are the simplest and least common sponge body from.
What are some features of the sponge’s body?
Sponges exhibit resemblances with colonial Protozoa in having the following features: Absence of digestive cavity and presence of intracellular digestion. Presence of collar cells and amoeboid cells like those of colonial flagellates. The production of skeleton by single cell or a group of cells. The cells of sponge body are interdependent in their function.
What are some characteristics of sponges?
Physical Characteristics. Sponges are clumps of cells arranged around masses of tubes. The surface is covered with small holes. The movement of whiplike cells in the center of the sponge draws water through the holes and into the sponge.
