| 词条 | Hallirhoidae |
| 释义 |
| name = Hallirhoidae | fossil_range = Cretaceous - Eocene | image = Hallirhoidae.jpg | image_caption = Various Cretaceous Hallirhoiids | regnum = Animalia | phylum = Porifera | classis = Demospongiae | ordo = Heteroscleromorpha | familia = Hallirhoidae | subdivision_ranks = genus | subdivision =
}}{{Unreferenced|date=December 2008}}Hallirhoidae is an extinct family of heteroscleromorph 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.[1] References1. ^{{Cite web|url=http://natuurtijdschriften.nl/search?identifier=404798|title=Callopegma en Phymatella, twee tetracladine krijtsponzen van Westerhaar en Sibculo|last=|first=|date=|website=natuurtijdschriften.nl|archive-url=|archive-date=|dead-url=|access-date=2019-01-22}} {{Taxonbar|from=Q5643013}}{{paleo-sponge-stub}} 9 : Heteroscleromorpha|Prehistoric sponge families|Cretaceous first appearances|Maastrichtian taxonomic families|Danian taxonomic families|Selandian taxonomic families|Thanetian taxonomic families|Ypresian taxonomic families|Eocene extinctions |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。