What is Stegastes nigricans?
{{Speciesbox | image = Stegastes_nigricans_1.jpg | taxon = Stegastes nigricans | authority = ([[Bernard Germain de Lacépède|Lacépède]], 1802) | synonyms = *''[[Holocentrus]] nigricans'' <small>Lacepède, 1802</small> *''[[Eupomacentrus]] nigricans'' <small>(Lacepède, 1802</small>) *''[[Parapomacentrus]] nigricans'' <small>(Lacepède, 1802)</small> *''[[Pomacentrus]] nigricans'' <small>(Lacepède, 1802)</small> *''Pomacentrus scolopseus'' <small>[[Jean René Constant Quoy|Quoy]] & [[Joseph Paul Gaimard|Gaimard]], 1825</small> *''Pomacentrus taeniops'' <small>[[Georges Cuvier|Cuvier]], 1830</small> *''Pomacentrus scolopsis'' <small>[[Albert Günther|Günther]], 1862</small> *''Pomacentrus subniger'' <small>[[Charles Walter De Vis|De Vis]], 1885</small> *''[[Abudefduf]] tamaii'' <small>Aoyagi, 1941</small> }} '''''Stegastes nigricans''''', the '''dusky farmerfish''', is a species of [[Pomacentridae|damselfish]] found around [[coral reef]]s at a depth of one to 12 meters, in [[tropical climate]]s between 30°S and 30°N. They are known for farming [[monoculture]]s of algae such as [[cyanophore]]s and [[rhodophyte]]s. It has an average length of 9.0&nbsp;cm, but can reach lengths of 14.0&nbsp;cm. It has 12 [[Dorsal fin|dorsal spines]], and 15 to 17 dorsal soft rays. It also has 2 [[Fish fin#AnchAnal|anal spines]] and 12 to 14 anal soft rays. Adults are generally brown, with the dorsal parts of the head and nape being darker, grading to tan on the lower parts of the head and breast. The scales have darker brown margins. The lips are whitish, the suborbital is mostly blue, and the [[Operculum (fish)|preopercle and opercle]] scales have blue centers. The median and [[Fish fin#AnchVentral|pelvic fins]] are brown, the [[Fish fin#AnchPectoral|pectorals]] are dusky, and sometimes there's a well-defined dark brown or blackish spot at the base of the posteriormost dorsal rays, which distinguishes it from the ''[[Stegastes lividus|S. lividus]]'', where the spot is diffuse. When males are in courtship or guarding their eggs