Sponge | Definition, Features, Reproduction, & Facts | Britannica
2025年1月10日 · Sponge, any of the primitive multicellular aquatic animals that constitute the phylum Porifera. They number approximately 5,000 described species and inhabit all seas, where they occur attached to surfaces from the intertidal zone to depths of …
Sponge - Wikipedia
Sponges are multicellular organisms consisting of jelly-like mesohyl sandwiched between two thin layers of cells, and usually have tube-like bodies full of pores and channels that allow water to circulate through them.
Characteristics and life cycle of sponges | Britannica
sponge, Any of some 5,000 species (phylum Porifera) of permanently affixed (sessile), mostly marine, solitary or colonial invertebrates, found from shallow to deep (more than 30,000 ft, or 9,000 m) waters. Simple sponges are hollow cylinders with a large opening at the top through which water and wastes are expelled.
Sponges - MarineBio Conservation Society
Sponges are considered animals because they are multicellular and lack cell walls, which distinguishes them from plants and fungi. Sponges are typically found in aquatic environments, both in saltwater and freshwater habitats. They come in various shapes, sizes, and colors, ranging from encrusting forms to large vase-like structures.
What is a sponge? - NOAA's National Ocean Service
Sponges — simple aquatic animals with dense, yet porous, skeletons — are highly adapted to their environments. A variety of sponges dot the seascape of Flower Garden Banks National Marine Sanctuary. From round to encrusting to branching, the colors and textures of sponges add to the complexity of the reef. Credit: G.P. Schmahl. Did you know?
Sea Sponges or Porifera - Definition, Types, Reproduction, and …
2024年12月30日 · Sponges have a simple but effective body design built for filtering water to get food. Let's look at how their basic parts work together. The body is shaped like a tube with a hollow center where water flows through.Small holes in the body wall let water in, while a larger hole at the top (called the osculum) lets it out.; The body wall has three main parts: an outer layer, a jelly-like middle ...
ADW: Porifera: INFORMATION
Sponges are a diverse group of sometimes common types, with about 5000 species known across the world. Sponges are primarily marine, but around 150 species live in fresh water.
Sponge - Filter Feeding, Skeleton, Reproduction | Britannica
2025年1月10日 · Sponges accumulate silicon, calcium, and considerable quantities of metals. The spongins are iodine or bromine-containing scleroproteins similar to the keratin found in skin, claws, hair, and feathers of other animals. The two types of spongin, known as A and B, differ in composition and structure.
Phylum Porifera - Definition, General Characteristics, …
2024年3月20日 · Phylum Porifera refers to a group of simple, sessile aquatic animals commonly known as sponges. Sponges lack true tissues and organs and have a porous body structure with numerous channels and chambers that allow water to flow through them. They feed by filtering small particles from the water and are considered to be the simplest multicellular ...
Sponges: Definition, Features and Habitat | Phylum Porifera
General Features of Sponges: 1. All are aquatic; mostly marine (98%) but a few are freshwater (Fam. Spongillidae). 2. They are sessile and sedentary animals. 3. Body either asymmetrical or some radially symmetrical in adult stage. 4. Multicellular organisms having cellular grade of organization without true tissues.