Hallirhoidae
| Hallirhoidae Temporal range: Cretaceous - Eocene | |
|---|---|
 | |
| Various Cretaceous Hallirhoiids | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Porifera |
| Class: | Hexactenellida |
| Order: | Lithistida |
| Family: | Hallirhoidae |
| genus | |
| |
Hallirhoidae is an extinct family of lithistid demosponges found throughout the world from the Cretaceous to the Eocene, whereupon they became extinct. The highest concentration of species occurred in the Tethys Ocean during the upper Cretaceous. The hallirhoid demosponges were very distinctive-looking, largely pear-shaped sponges that were attached to the seafloor by a long stem-like stalk.
References
This article is issued from Wikipedia - version of the Friday, May 06, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.