File:Haeckel_Hexactinellae.jpg · Wikimedia Commons · See Wikimedia Commons
hexactinellid
Sign in to saveAlso known as Hexactinellida
thumb|Bolosoma stalked glass sponge Hexactinellid sponges are sponges with a skeleton made of four- and/or six-pointed siliceous spicules, often referred to as glass sponges. They are usually classified along with other sponges in the phylum Porifera, but some researchers consider them sufficiently distinct to deserve their own phylum, Symplasma. Some experts believe that glass sponges are the longest-lived animals on earth; these scientists tentatively estimate a maximum age of up to 15,000 years.
Species
glass sponges
Class
- PhylumPorifera
- ClassHexactinellida
六放海绵纲（Hexactinellida）为多孔动物门的一个纲。该纲动物具有硅质骨针，有些骨针能聚合成网状的骨架。骨骼中无海绵质。本纲又称为玻璃海绵。六放海绵纲动物大多数生活在200～8500米的海底。
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- Image
- Haeckel Hexactinellae.jpg
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- Commons category
- Hexactinellida
- taxon name
- Hexactinellida
- taxon common name
- 玻璃海绵纲
Sources (1)
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Article
9 sectionsContents
- Biology
- Syncytia
- Longevity
- Reefs
- Conservation
- Evolution and taxonomy
- See also
- References
- External links
thumb|Bolosoma stalked glass sponge Hexactinellid sponges are sponges with a skeleton made of four- and/or six-pointed siliceous spicules, often referred to as glass sponges. They are usually classified along with other sponges in the phylum Porifera, but some researchers consider them sufficiently distinct to deserve their own phylum, Symplasma. Some experts believe that glass sponges are the longest-lived animals on earth; these scientists tentatively estimate a maximum age of up to 15,000 years.
== Biology == Glass sponges are relatively uncommon and are mostly found at depths from below sea level. Although the species Oopsacas minuta has been found in shallow water, others have been found much deeper. They are found in all oceans of the world, although they are particularly common in Antarctic and Northern Pacific waters.