Hallirhoidae

Hallirhoidae is an extinct family of heteroscleromorph demosponges found throughout the world from the Cretaceous to the Eocene, whereupon they became extinct.[1] 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.[2][3]

Hallirhoidae
Temporal range: Cretaceous - Eocene
Various Cretaceous Hallirhoiids
Scientific classification
Kingdom: Animalia
Phylum: Porifera
Class: Demospongiae
Subclass: Heteroscleromorpha
Family: †Hallirhoidae
Genera

References
  1. Carlton, Robert L. (2018-03-07). A Concise Dictionary of Paleontology. Springer. ISBN 9783319730554.
  2. "Callopegma en Phymatella, twee tetracladine krijtsponzen van Westerhaar en Sibculo". natuurtijdschriften.nl. Retrieved 2019-01-22.
  3. "Sponge". The Fossil Forum. Retrieved 2019-05-21.


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