| 名稱 拋光苔蘚蟲化石 | Name Polished Bryozoan fossil |
| 地質年代 奧陶紀 | Geological Age Ordovician |
| 描述 苔蘚蟲是一種固定生活的群體動物。群體的形狀各不相同，有的像被單一樣蓋在貝殼或岩石上；有的則像小樹或網狀複葉。每個群體都由數千個單體組成，每個單體都有管狀或盒狀的骨骼。牠們的外觀雖然很像植物，但具一套完整的消化器官，包括口、食道、胃、腸臟和肛門等。其個體小，不分節，具體腔。 體外分泌一層膠質，形成群體的骨胳。蟲體前端有口，口的周圍有一冠狀物，稱「總擔」，其上生許多觸手。消化道呈U字形，口和肛門十分靠近。無排泄和循環器官。 | Description Bryozoa are a phylum of aquatic invertebrate animals. Typically about 0.5 millimetres (0.020 in) long, they are filter feeders that sieve food particles out of the water using a retractable lophophore, a “crown” of tentacles lined with cilia. Most marine species live in tropical waters, but a few occur in oceanic trenches, and others are found in polar waters. One class lives only in a variety of freshwater environments, and a few members of a mostly marine class prefer brackish water. 5869[7] living species are known. One genus is solitary and the rest are colonial. |
| 地點 / | Location / |
| 參考 Reference https://en.wikipedia.org/wiki/Bryozoa | |
| 編者 由卓志鵬博士於7/4/2020編寫 _________ 於17/1/18最後編改 | Editor Created by Dr. Chuck Chi Pang on 7/4/2020 Last modified by ________ as on 17/1/2018 |
