What is Porifera classification?

Phylum Porifera is an exclusive classification of aquatic animals. It belongs to the Animalia kingdom with a sponge-like structure. As it is a multicellular organism, the cells are arranged either randomly symmetrical or asymmetrical. They are simply called with the name of sponges.

What is the meaning of Hexactinellida?

Hexactinellids (glass sponges) are deepwater marine sponges that have skeletons of siliceous (glass) spicules with a distinctive triaxonic (cubic three-rayed) symmetry. Unlike the other two main classes of sponges (Calcarea and Demospongiae), glass sponges lack either a calcareous or organic skeleton.

What are the examples of Hexactinellida?

Hexasterophora
LyssacinosidaEuplectellidaeAmphidiscophoraStauroderma
Glass sponges/Lower classifications

What are the characteristics of Hexactinellida?

Overview. Hexactinellida are characterized by having siliceous hexactine (six-pointed) spicules, making them the second class within the major sponge group Silicea. They also construct two different body plans: sycon and leucon.

What are 5 examples of Porifera?

Some common examples of Porifera

  • Sycon.
  • Hylonema.
  • T.S. Of Sycon. 3.1 Water(enters) –⇒ostia–⇒incurrent canal–⇒passes into radial canals through prosopyles–⇒ from radial canal into spongocoel by apopyles—⇒leaves spongocoel by osculum.
  • L.s. of sycon.
  • SPICULES OF SPONGES.
  • GEMMULE.
  • Cliona.
  • Euplectella.

What is the distinguishing characteristics of Porifera?

Characteristics of Phylum Porifera Only a few are found in freshwater. They are either radially symmetrical or asymmetrical. Their body is usually cylindrical. The scleroblast secretes spicules while spongin fibres are secreted by spongioblasts.

What is the other name of Hexactinellida?

glass sponge, any of a class (Hexactinellida, also called Hyalospongiae, or Triaxonia) of sponges characterized by a skeleton that consists of silica spicules (needlelike structures) often united into a delicate geometric network—e.g., that of Venus’s flower basket (q.v.).

Why is Hexactinellida called glass sponge?

Glass sponges in the class Hexactinellida are animals commonly found in the deep ocean. Their tissues contain glass-like structural particles, called spicules, that are made of silica (hence their name).

Where are Hexactinellida found?

the deep ocean
Glass sponges in the class Hexactinellida are animals commonly found in the deep ocean. Their tissues contain glass-like structural particles, called spicules, that are made of silica (hence their name).

What type of canal system does Hexactinellida have?

The skeleton consists of six-rayed siliceous spicules. The rays lie in three mutually perpendicular planes; in some of the needles, one or more rays are reduced. The canals that thread through the body wall (the canal system) are of the simple leuconoid type.

What are the main characteristics of Porifera?

What are the characteristics of phylum Porifera?

  • These are pore-bearing multicellular animals.
  • The body has no organs.
  • They exhibit holozoic nutrition.
  • The body is radially symmetrical.
  • They can regenerate their lost parts.

What are 5 characteristics 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.

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