Amphidiscosida

Amphidiscosida is an order of hexactinellid sponges characterized by amphidisc spicules, that is, spicules having a stellate disk at each end.[2] They are in the class Hexactinellida and are the only order classified in the monotypic subclass Amphidiscophora.[3] Species of the order Amphidiscosida have existed since the Ordovician period, and still flourish today.[4]

Amphidiscosida Temporal range: Ordovician–Recent PreꞒ Ꞓ O S D C P T J K Pg N
On exhibit in Naturmuseum Senckenberg
Scientific classification
Kingdom:	Animalia
Phylum:	Porifera
Class:	Hexactinellida
Subclass:	Amphidiscophora Schulze, 1886
Order:	Amphidiscosida Schrammen, 1924[1]
Families
Hyalonematidae Gray, 1857 Monorhaphididae Ijima, 1927 Pheronematidae Gray, 1870

Families

• Hyalonematidae Gray, 1857[5]
• Monorhaphididae Ijima, 1927[6]
• Pheronematidae Gray, 1870[7]

References

1. Schrammen, A. (1924). Die Kieselspongien der oberen Kreide von Nordwestdeutschland. Volume 3. Berlin: Gebrüder Borntraeger.
2. "Amphidiscophora".CS1 maint: ref=harv (link)
3. "Search Results - AccessScience from McGraw-Hill Education". www.accessscience.com. Retrieved 9 February 2019.
4. "Hexactinellida: Fossil Record".CS1 maint: ref=harv (link)
5. Gray, J. E. (1857). Synopsis of the families and genera of axiferous zoophytes or barked corals. Proceedings of the Zoological Society of London, 25(1), 278–294.
6. Ijima, I. (1927). The Hexactinellida of the Siboga Expedition. In Weber, M. (Ed.), Siboga-Expeditie (1–383). Leiden: E. J. Brill.
7. Gray, J. E. (1870). Notes on anchoring sponges (in a letter to Mr. Moore). The Annals and Magazine of Natural History, [4]6(34), 309–312.