Read on to find out how sponges use their special holes and tunnels to eat and breathe, and how you use these same holes and tunnels to soak up the water and rinse off the soap. Many sponges have internal skeletons of spongin andor spicules skeletallike fragments of calcium carbonate or silicon dioxide. See more ideas about sea sponge, flower basket and types of sponges. The many diverse orders in this class include all of the large sponges. Their skeletons are made of spicules consisting of fibers of the protein spongin, the mineral silica, or both. Their skeletons are made of spikelike structures consisting of fibers of the protein spongin and the mineral silica. Hexactinellid sponges have sturdy latticelike internal skeletons made up of fused spicules of silica. Different groups of sponges hadhave skeletons composed entirely of spongin a tough organic compound that readily decomposes after death, entirely of silica opala in the form of siliceous spicules, of both spongin and silica, or of calcium carbonate in the form of spicules or as layered and crosssupported walls. Its bath time, and your sponge is actually the skeleton of an animal that lived under the sea. It is also involved in magnetic orientation, gravity detection, and the storing of ions. Porifera have no internal organs, nervous tissue, circulatory system, or digestive systems, making them the most primitive of the multicellular animals. Hemoscleromorpha sponges tend to be massive or encrusting in form and have a very simple structure with very little variation in spicule form all spicules tend to be very small. Bath sponges have spongin skeletons and lack siliceous spicules altogether. Sponges is now available with audio readalong in an ipadfriendly format.
As a whole, poriferans have diverse skeletal elements including calcareous laminae, organic filaments, and siliceous and calcareous spicules. Calcareous sponges produce spicules made of calcium carbonate. Holly keller explains how sponges are animals that live in the ocean and how they are harvested and used by humans. Book clubs book fairs scholastic education classroom magazines about us. Other sponges grow into elaborate shapes, such as tubes, webs, and vases.
Sponges are basal animals that lack true tissues a complete digestive tract the ability to make organic compounds from co2 and water a nervous system true tissues all of the listed responses are correct. These are also called coralline sponges after their multilayered calcium carbonate skeletons. The most famous glass sponge is a species of euplectella, shown here in the northwestern gulf of mexico. Spicules are formed by carbonates of lime or silica in the form of needle like pieces. Although there are freshwater species, the great majority are marine salt. Sponges build their skeletons in a completely different way than other animals do, researchers have found.
In structure, function, and development, sponges are distinct from other animals. I like how the book clarified that most sponges we used are made in factories. Sponges, like all animals, possess some sort of a skeleton that gives their bodies shape. My son loved the book and was excited when he found real sponges washed on the beach.
Sponges are skeletons letsreadandfindout science 2. Phylum porifera characteristics, types, functions and. There was quite a bit of information presented in a readable way. A fourth class of sponges, the sclerospongiae, was described from species discovered in underwater tunnels. The book invites you into the underwater world of sea sponges and explains how they grow in different colors and shapes.
Sponges use various materials to reinforce their mesohyl and in some cases to produce skeletons, and this forms the main basis for classifying sponges. Barbara juster esbensen and holly keller have paired an engaging text with funny, kidfriendly illustrations to show that a sponge is not just a bath toy. Did you know your bath sponge once lived in the sea. Where spicules of silica are present, they have a different shape from those in the otherwise similar glass sponges. Traditionally the living species of sponges have been divided into three classes. A new genus of aspiculate homoscleromorph, pseudocorticium, is described along with the new species p. A sponge is an animal that grows in one spot like most plants do. Adventist youth honors answer booknatureporifera and.
This sponge, monorhaphis chuni, belongs to the class of glass sponges, which have skeletons made with silicon. Esbensen describes the sponge as the skeleton of an animal, but gives few specifics on the live animal. There is an illustration of the skeletal structure of a person and a cat which is a. Because their cells are interconnected in this way, the hexactinellid sponges have no mesohyl. A bath sponge, with protein spicules, the framework skeleton of a glass sponge, with silica spicules, and two different shapes of sponges preserved as fossils. Members of this group include glass sponges, demosponges, and calcareous sponges. A 10foot long, 11,000yearold sponge skeleton has a. There is an illustration of the skeletal structure of a person and a cat which is a pretty cool way to explain that sponges are skeletons. Sponges are skeletons 4 out of 5 based on 0 ratings. The skeleton of sponges consists of microscopic calcareous or silicious spicules. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Explains how sponges are animals that live in the ocean and how they are harvested and used by humans.
The demospongiae are the largest class in the phylum porifera. Biomineralization is the process that produces the skeletons, shells, and teeth of most animals. Sponges are skeletons by barbara juster esbensen scholastic. Skeleton in sponges zoology for ias, ifos and other. Spongin fibres are composed of a silklike scleroprotein. I kept waiting for them to mention that maybe we shouldnt harvest sponges and kill them so we could take our baths, but i was pleasantly. Identifying sponges the identification of sponges is very difficult due to their unique morphological traits and intraspecific variability in shape and colour. Examples include the genera hippospongia, meyenia, spongia, and spongilla.
The author explains that sponges are animals that grow underwater and describes how they are used by humans. Adventist youth honors answer booknatureporifera and cnidaria. But still sponges are more than colonies of independent cells. In many ways, animals from the phylum cnidaria seem very similar to sponges. Where the spikelike structures of silica are present, they have a different shape from those in the similar glass sponges. Phylum porifera is a group of simple animals that includes the sponges. The demosponge is the largest class in the phylum porifera. Float along with a diversity of sponges and explore where they live, how their skeletons support their bodies, and how they eat. Skeletal structures in porifera skeletal structures of sponges are spicules and spongin fibres. The animal nature of sponges, first described in 1755, was confirmed in 1765 after observations of their water currents and the changes in diameter of the openings into their central cavity. The latter are also called glass sponges because their skeletons have a glass texture. Sponges are skeletons is very interesting and educational.
Barrel sponges glass sponges glass sponges are deepsea sponges with beautiful, delicate skeletons. Sponge simple english wikipedia, the free encyclopedia. This book compares a diverse number of systems, including mineral deposition of invertebrates, vertebrates, algae, and. This is a great book about sponges as far as picture books about sponges go. All sponges are sessile aquatic animals, meaning that they attach to an underwater surface and remain fixed in place i. Sponges porifera are a group of animals that includes about 10,000 living species. Adult sponges are sessile animals that live attached to hard rocky surfaces, shells, or submerged objects. Sponges can be almost any color and look like tubes, fans, vases, cups, or barrels. Barrel sponges among the largest of all sponges are the barrel sponges, which grow on tropical coral reefs. Commonly called the venus flower basket, this sponge builds its skeleton in a way that entraps a certain species of crustacean inside for life.
The demosponges include 90% of all species of sponges. Following types of cells are present in phylum porifera. Sponges are skeletons by barbara juster esbensen, holly. Sponge cells build skeletons with poleandbeam structure. All members of this class have a leuconoid body plan and most are marine, except the members of the freshwater family spongillidae. To support and protect their soft bodies, sponges produce skeletons of calcium carbonate, silica, or a soft organic material called spongin. Spicules the spicules constitute major part of skeletal system, which are secreted by special mesenchymal cells called scleroblasts.
Most sponges have skeletons made of a protein material called spongin and spicules made of calcium carbonate or silica. Sponges are generally placed in the phylum porifera. What are the three types of skeletons sponges have. It is a simple animal with many cells, but no mouth, muscles, heart or brain. Researchers reporting in the cell press journal current biology on september 17 have found that sponges build their skeletons in a completely. Their skeletons are made of spicules consisting of fibers of the protein sponge, the mineral silica, or both.
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