| Named By: | Dore & Reid in 1965 |
| Time Period: | Cambrian Stage 2-Middle Cambrian |
| Location: | Antarctica - Cape Melville Formation. Australia - Coobowie Limestone Formation, Kulpara Formation, Parara Limestone Formation. China. Jordan - Burj Formation |
| Size: | Unavailable |
| Diet: | unavailable |
| Fossil(s): | Numerous specimens |
| Classification: | | Animalia | Coeloscleritophora | Chancelloriida | Chancelloriidae | |
| Also known as: | | Dimidia | Onychia | Rosella | Zhurinia | |
Allonnia is a genus of coeloscleritophoran known as complete scleritomes from the Middle Cambrian Burgess Shale. It is also a constituent of the small shelly fauna.
Its earliest occurrence in Yunnan dates to the Upper Meishucunian (~ Tommotian / Cambrian Stage 2)