伸展角石

{{Automatic Taxobox
| taxon = Ectenolites
| fossil_range = 寒武紀晚期–奧陶紀早期
| image =
| image_caption =
| authority = Ulrich & Foerste, 1935
| type_species = Ectenolites subgracilis海洋中的頭足類。其化石分布於美國和中國等地。

物種
*Ectenolites clelandi Ulrich & al. 1944
*Ectenolites extensus Flower, 1964
*Ectenolites primus Flower, 1964
*Ectenolites sinuatus Flower, 1964
*Ectenolites subgracilis Ulrich & Foerste, 1935

參考文獻
史前頭足綱