Grantia compressa is a species of calcareous sponge belonging to the family Grantiidae. It is a very common species of rocky shores along the Atlantic coasts of Europe from France northwards.

How do you identify Grantia?

Description: This sponge is usually white to cream in colour but occasionally pale brown individuals occur. It is flat, like a small hot water bottle and open at one end, it may also be tubular, or composed of contorted flat lobes, with a very short stalk. The surface of the sponge is smooth and clean.

What is Grantia body plan?

These skeletal differences are used to classify sponges. Grantia demonstrates the sycon body plan in which the wall of the colony is folded into a series of internal and external canals that circulate water to bring in dissolved oxygen and prey while removing waste products.

How do Grantia reproduce?

Budding and fragmentation allows Grantia sponges to form identical offspring while sexual reproduction permits genetic mixing. Environmental conditions including water temperature, tidal stage, and the phase of the moon need to be near perfect or else sexual reproduction by these sponges is postponed.

Is grantia a plant or animal?

Grantia compressa (Compressed Purse Sponge) is a species of sponges in the family Grantiidae. They are omnivores.

What is the shape of grantia?

Shape, size, surface and consistency: Flat, like a small hot water bottle (Grantia compressa MCS2), but may be tubular, or composed of contorted flat lobes; with a very short stalk. Surface smooth, has a moderately high friction when stroked.

Do sponges have spicules?

Spicules are the structural components of a sponge, or the “bricks,” and the shapes, sizes, and composition are unique for each species. Together, you can look at these features under a microscope to make a positive identification. Spicules are composed of either Calcium or Silica.

What is the shape of the grantia sponge?

Form: Flat, like a small hot water bottle, but may be tubular, or composed of contorted flat lobes; with a very short stalk. Colour: White or occasionally brown.

What is the common name of sycon?

Scypha, also called sycon, genus of marine sponges of the class Calcarea (calcareous sponges), characterized by a fingerlike body shape known as the syconoid type of structure.

What do grantia spicules do?

Spicules are needle-like structures composed of either calcium carbonate or silica and offer support and protection.

What is water canal system?

Canal system is also known as aquiferous system. The canal system of sponges helps in food acquisition, respiratory gas exchange and also in excretion. The numerous perforations on the body surface of the sponges for ingression and egression of water current are the main constituents of the canal system.

Is Grantia a sycon?

Class Calcarea – Leucosolenia (an ascon sponge), Grantia (a sycon sponge).

Why are Leuconoid sponges so big?

Their body design allows for a much greater body size. The increased (surface area) increases the amount of choanocytes, therefore increasing the amount of food that can be consumed, which increases the body size. Most leuconoids are large masses rather than simple tubes, with numerous oscula.

Do sponges lack true tissue?

The sponges and the cnidarians represent the simplest of animals. Sponges appear to represent an early stage of multicellularity in the animal clade. Although they have specialized cells for particular functions, they lack true tissues in which specialized cells are organized into functional groups.