Doto hystrix is similar in colour to Doto fragilis, but with ceratal tubercles conical in shape, sharp pointed. The rhinophore sheaths are characteristic, the rim being drawn out into a series of points. The body is uniformly brown.
Doto hystrix feeds exclusively on the plumulariid hydroid Schizotricha frutescens ( synonym Polyplumaria frutescens).
The spawn is laid on the hydroid, it is often pale pink in colour.
Doto hystrix has a widespread distribution in the British Isles, but rather local in its occurrence.