Parablennius pilicornis is a particularly fascinating species of blenny due to the wide colour variations that it displays: from golden yellow through (almost) black, both with a faint speckling, to a light or dark patterned version – in which the ringed neck (under the chin) is most obvious.
Dorsal finrays XII + 21; anal finrays II + 23; pectoral finrays 14; pelvic finrays I + 3. Colour: variable, mostly 'spot pattern'; basically yellowish-green and body and dorsal fin with irregular dark brown spots. Spawning males with bulb glands on spiny anal finrays. Size: to 11 cm.
Rocky shores, often at steep walls of surf-exposed sites, from 0.3 to 6m.
Food: invertebrates, especially polychaetes.
Reproduction: no data.
Some researchers have speculated that the golden variety is a developmental phase of the species, as it tends to be about half the size of the other variations.