| 名稱 石燕化石 | Name Mucrospirifer |
| 地質年代 / | Geological Age / |
| 描述 雙凸殼通常長2.5厘米，但有時長到4厘米。石燕化石的殼有褶皺，它沿著鉸接線大大拉長，鉸接線向外延伸形成尖點。這個生活在泥濘的海洋沉積物中，通過蒂被附著在海床上，殼有時看起來像兩個貝殼粘在一起。 這種腕足動物的體型相對較大，殼沿著其鉸合線展開時達到最寬，其向外展開形成銳利的尖端。臂狀瓣上有明顯的摺皺，在腳狀瓣上有與其對應的凹陷。腳狀瓣的頂部有小孔使牠們的腳能自由出入。 | Descriptions Mucrospirifer fossil is a genus of extinct brachiopods in the class Rhynchonellata and the order Spiriferida. They are sometimes know as ‘butterfly shells’. Like other brachiopods, they were filter feeders. These fossils occur mainly in Middle Devonian strata. The biconvex shell was typically 2.5 cm long, but sometimes grew to 4 cm. The shell of Mucrospirifer has a fold, sulcus and costae. It is greatly elongated along the hinge line, which extends outward to form sharp points. This gives them a fin- or wing-like appearance. The apex area (umbo) of the pedicle valve contains a small fold for the pedicle. Mucrospirifer lived in muddy marine sediments, and were attached to the sea floor via the pedicle. The shell sometimes looks like two seashells stuck together. |
| 地點 廣西 | Location Guangxi |
| 參考 Reference / | |
| 編者 由 3A (28) 王妍曦 於 29/5/2018編寫 3C (24) 吳溢賢 於30/5/2019最後編改 | Editor Created by 3A (28) Wong Yin Hei on 29/5/2018 Last modified by 3C (24) Ng Yat Yin on 30/5/2019 |
