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Hallirhoidae : ウィキペディア英語版 | Hallirhoidae
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.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Hallirhoidae」の詳細全文を読む
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