- Kingdom: Animalia
- Phylum: Chordata
- Subphylum: Vertebrata
- Superclass: Gnathostomata
- Class: Actinopterygii
- Order: Perciformes
- Family: Stichaeidae
- Scientific name: Chirolophis ascanii
- Norwegian: hornkvabbe
The Yarrell's blenny is approximately of the same size as the similar butterfish. It does not grow longer than 25 cm. However, it lacks the dark spots of the butterfish. On the head there are two small, branched tentacles. The first two or three rays of the dorsal fin are branched as well. The dorsal fin runs from behind the head and down the entire body length. The color is usually pale brown with pink blotches.
It usually lives from the subtidal zone and down to 40 meters. It thrives on rocky locations where it hides between stones and in crevices.
It is registered in northern Europe, including Norway, the British Isles, the Orkneys, Faroes, Shetlands and Iceland. It is rare in Skagerak and Murmansk.