A line of yellow across a restricted map
The Sulfurhead Peacock male can look as though a narrow beam of yellow light has fallen from the forehead along the top of a dark blue body. The pattern is so clear that the common name almost functions as a field description.
The distribution is even narrower. Aulonocara maylandi is associated with Chimwalani Reef and nearby Luwala Reef in the southeastern arm of Lake Malawi. Two small reef systems carry most of the wild story.
A species named in 1984
Ethelwynn Trewavas described A. maylandi in 1984. The name honors Hans-Georg Evers Mayland, and the species became one of the best-known examples of a localized peacock whose visual identity is inseparable from its geography.
Its description arrived during an era when Lake Malawi aquarium collecting and detailed taxonomic work were revealing how many familiar trade fishes represented restricted populations rather than lake-wide color types.
The sulfur line over a listening head
Beneath the yellow blaze lies the enlarged sensory-canal system of Aulonocara. The fish lives around sand and rock, detecting tiny invertebrates hidden in the substrate and striking where movement gives prey away.
The male display may be the first thing a person remembers. The sensory ecology is the reason the head is shaped and perforated as it is.
Critically Endangered makes the farm part of the solution
The 2018 IUCN assessment lists A. maylandi as Critically Endangered. With such a narrow range, one destructive pressure can affect a substantial portion of the species rather than one expendable local population.
Captive breeding is therefore not an ornamental side story. It gives aquarists a renewable source, maintains living populations and breeding knowledge away from the reefs, and reduces the need for wild collection. Fish farms cannot guard Chimwalani Reef, but they can stop making that reef replace every Sulfurhead sold around the world.