File:Haeckel_Calcispongiae.jpg · Wikimedia Commons · See Wikimedia Commons
Species
calcareous sponges
Calcarea
CLASS
- KingdomAnimalia
- PhylumPorifera
- ClassCalcarea
取自“https://zh.wikipedia.org/w/index.php?title=钙质海绵纲&oldid=48272605” 分类：钙质海绵纲隐藏分类：本地相关图片与维基数据相同無脊椎動物小作品
via GBIF
Wikidata facts
- Image
- Haeckel Calcispongiae.jpg
Show 3 more facts
- taxon name
- Calcarea
- Commons category
- Calcarea
- taxon common name
- 石灰海绵纲
Sources (1)
via Wikidata · CC0
~4 min read
Article
The calcareous sponges or calcereans are sponges that make up the class Calcarea, characterized by spicules made of calcium carbonate in the form of high-magnesium calcite or aragonite. While the spicules in most species are triradiate (with three points in a single plane), some species may possess two- or four-pointed spicules. Unlike the far more common siliceous sponges, calcareans lack microscleres, tiny spicules which reinforce the flesh. In addition, their spicules develop from the outside-in, mineralizing within a hollow organic sheath.
Biology