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  • freshwater sponge —  any of about 20 species of the genus Spongilla (class Demospongiae, siliceous sponges), a common, widely occurring group. Spongilla species are found in clean lake waters and slow streams.       Freshwater sponges are delicate in structure,… …   Universalium

  • Sponge spicule — Sponge spicules Spicules are structural elements found in most sponges. They provide structural support and deter predators. Large spicules, visible to the naked eye are referred to as megascleres, while smaller, microscopic ones are termed… …   Wikipedia

  • Sponge — This article is about the aquatic animal. For the porous cleaning tool, see Sponge (material). For other uses, see Sponge (disambiguation). Sponge Temporal range: Ediacaran–Recent …   Wikipedia

  • sponge — spongeless, adj. spongelike, adj. spongingly, adv. /spunj/, n., v., sponged, sponging. n. 1. any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or… …   Universalium

  • Freshwater environmental quality parameters — are the natural and man made chemical, biological and microbiological characteristics of rivers, lakes and ground waters, the ways they are measured and the ways that they change. The values or concentrations attributed to such parameters can be… …   Wikipedia

  • siliceous sponge — ▪ sponge       any sponge in which the main skeletal component is silica as opposed to calcium carbonate or fibrous organic materials only. More than 95 percent of all known sponge species have a siliceous skeleton and belong to the class… …   Universalium

  • Polymastia (sponge) — Taxobox name = Polymastia regnum = Animalia phylum = Porifera classis = Demospongiae ordo = Hadromerida familia = Polymastiidae genus = Polymastia genus authority = Bowerbank, 1863 subdivision ranks = Species subdivision = see text Polymastia is… …   Wikipedia

  • Spongilla —       sponge genus that includes the freshwater sponge (q.v.) species. * * * …   Universalium

  • Spongilla argyrosperma — Taxobox name = Freshwater sponge (North America) image caption = regnum = Animalia phylum = Porifera classis = Demospongiae ordo = Haplosclerida subordo = Spongillina familia = Spongillidae genus = Spongilla species = S. argyrosperma binomial =… …   Wikipedia

  • Spongilla — Taxobox image width = 250px image caption = Spongilla lacustris found in the Hanford Reach of the Columbia River, Washington, USA. name = Spongilla regnum = Animalia phylum = Porifera classis = Demospongiae classis authority = Sollas, 1885 ordo …   Wikipedia

  • Ceramics of indigenous peoples of the Americas — Moche portrait vessel, Musée du quai Branly, ca. 100 700 CE, 16 x 29 x 22 cm …   Wikipedia

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