環蛸枕(學名:Linthia),又名林西海膽,是一屬已滅絕的海膽。牠們生存於晚白堊紀至上新世。其化石分佈在非洲、亞洲、歐洲、北美洲及南美洲。[1]
環蛸枕是一種很小、緊密的心海膽,在其前端有很突出的深凹口,線條分明的花瓣狀步帶長有孔。頂盤上四個大生殖孔用於排放卵和精子。牠們生活在鬆軟沉積的洞穴裡。[2][3]
- Linthia aguayoi Sánchez Roig, 1949
- Linthia alta Sánchez Roig, 1949
- Linthia arabica Clegg, 1933
- Linthia atolladosae Sánchez Roig, 1951
- Linthia avilensis Sánchez Roig, 1949
- Linthia balboi Airaghi, 1939
- Linthia boreasteria Nisiyama, 1968
- Linthia brodermanni Sánchez Roig, 1949
- Linthia bulgarica Gocev, 1933
- Linthia caraibensis Jeannet, 1928
- Linthia cretacica Sánchez Roig, 1949
- Linthia dainellii Stefanini, 1928
- Linthia darderi Lambert, 1935
- Linthia desioi Airaghi, 1934
- Linthia garciai Sánchez Roig, 1952
- Linthia gibba Lambert, 1933
- Linthia gonzalezmunozi Sánchez Roig, 1952
- Linthia hanoverensis Kellum, 1926
- Linthia hargeisensis Currie, 1943
- Linthia heimei Jeannet, 1936
- Linthia hollandi Barry, 1942
- Linthia maverickensis Gardner, 1933
- Linthia mortenseni Checchia-Rispoli, 1950
- Linthia mullerriedi Lambert, 1935
- Linthia obesa Arnold & H.L. Clark, 1934
- Linthia praenipponica Nagao, 1928
- Linthia pseudoglobalis Thirring, 1936
- Linthia rolandi Castex, 1930
- Linthia somaliensis Currie, 1927
- Linthia suitensis Jeannet, 1936
- 台灣林西海膽 Linthia taiwanensis Hayasaka, 1948
- Linthia trechmanni Hawkins, 1924
- Linthia yessoensis Minato, 1950