- siliceous sponges
- 六轴海绵类
English-Chinese geology dictionary (英汉地质大词典). 2013.
siliceous sponges
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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
Siliceous rock — Siliceous rocks are sedimentary rocks that have silica (SiO2) as the principal constituent. The most common siliceous rock is Chert other types include Diatomite. They commonly form from silica secreting organisms such as radiolarians, diatoms,… … 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
Diatom — For a molecule of two atoms, see Diatomic molecule. Diatoms Marine diatoms Scientific classification Domain … Wikipedia
Cnidaria — Temporal range: 580–0 Ma … Wikipedia
Ctenophora — For the genus of crane flies, see Ctenophora (genus). Comb jellies Temporal range: Cambrian – Recent … Wikipedia
Silicon — Not to be confused with the silicon containing synthetic polymer silicone. aluminium ← silicon → phosphorus C ↑ Si ↓ Ge … Wikipedia
Spicule — Spic ule, n. [L. spiculum a little point, a dart.] 1. A minute, slender granule, or point. [1913 Webster] 2. (Bot.) Same as {Spicula}. [1913 Webster] 3. (Zo[ o]l.) Any small calcareous or siliceous body found in the tissues of various… … The Collaborative International Dictionary of English
Jurassic Period — Interval of geologic time, 206–144 million years ago, that is one of the three major divisions of the Mesozoic Era, preceded by the Triassic Period and followed by the Cretaceous. During the Jurassic, Pangea began to break up into the present day … Universalium
Ordovician Period — Interval of geologic time, 490–443 million years ago, the second oldest period of the Paleozoic Era. It follows the Cambrian and precedes the Silurian. During the Ordovician, many of the landmasses were aligned in the tropics. Life was dominated… … Universalium
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
