Platygnathochromis

Genus Overview: Platygnathochromis

The genus Platygnathochromis represents an exceptionally rare, morphologically unique, and highly localized lineage of predatory non-Mbuna cichlids endemic to Lake Malawi. It is a monotypic genus containing only a single valid species: Platygnathochromis melanonotus. Natively tracking the wide sandy plains and intermediate transitional zones, this elusive hunter is specialized for wide-angle substrate scooping.

The Shovel Jaw & Bottom Ambush Traits

The name Platygnathochromis is a descriptive hybrid derived from the Greek words platys (flat or broad) and gnathos (jaw), completely identifying their core taxonomic trademark. All members of this lineage possess a significantly broadened, flattened lower mouth frame that projects forward like a small shovel or scoop.

In their natural wild biotope, this broad mouth profile serves an elite foraging function. While sleek predators chase schools in the upper water columns, Platygnathochromis melanonotus hovers closely along the sand lines. It utilizes its wide, shovel-like lower jaw to scoop up mouthfuls of loose sand and sediment, capturing small burrowed invertebrates, insect nymphs, and sleeping juvenile cichlids with a wide, efficient sweep.

Species & Colour Profile

There is only one recognized species within this lineage:

• Platygnathochromis melanonotus (Regan, 1922) – The Broad-Mouth Shovel Hap.

Females and sub-dominant juveniles display a cryptic, highly reflective silver-gray camouflage pattern consisting of a prominent dark horizontal stripe cutting across the lower half of their flanks. When a dominant male fully matures, he undergoes a beautiful colour shift—his entire head and upper back erupt into a shimmering metallic emerald-green and deep cobalt-blue sheen, complemented by a warm golden-yellow flush spreading along his lower stomach.

Aquarium Husbandry

Adult males can slowly achieve a maximum length of roughly 6.5 to 7.5 inches (16–19 cm), demanding an aquarium measuring at least 5 feet in length (100 to 125 gallons). To properly satisfy their natural behaviour and protect their broad mouth structures, a deep, clean layer of very fine, smooth sand substrate is a critical prerequisite; rough or sharp gravel will severely irritate their lip linings.

They are a remarkably peaceful, social, and non-aggressive genus toward any tank mates too large to fit whole into their mouths. They do beautifully inside mixed large "Hap and Peacock" community displays and can be easily fed high-quality commercial pellets, frozen krill, and mysis shrimp.