[1] It is represented by a single fossil species, Collinsium ciliosum, found in the Xiaoshiba Lagerstätte (Hongjingshao Formation) of China.

Similar to the later Hallucigenia it was a small worm-like creature with spikes along its back and feeding tentacles near its head.

Its body was covered in hair-like papillae and its fine anterior appendages were lined with setae.

Collinsium was a small animal with complete specimens reaching 85mm in length.

It was likely suited for climbing or anchoring on hard surfaces and used its long appendages to filter feed.