The genus Manonichthys, described by Gill in 2004, differs from other genera in the family Pseudochromidae in having an incomplete lower lip and a varying pterygiophore formula of the dorsal fin (usually with four pterygiophores inserting anterior to neural spine 4).
The genus contains 7 species, with two occurring in Australian waters. Species live within large tubular sponges.
Allen, G.R. & Erdmann, M.V. 2007. A new species of Manonichthys Gill, 2004 (Pisces: Pseudochromidae) from Irian Jaya Barat Province, Indonesia. Zoological Studies 46, 541-546.
Gill, A.C. 2004. Revision of the Indo-Pacific dottyback fish subfamily Pseudochrominae (Perciformes: Pseudochromidae). Smithiana, Publication in Aquatic Biodiversity, Monographs 1: 1-213.
Gill, A.C. & Williams, J.T. 2011. Description of two new species of Pseudochrominae from northern Palawan and Mindoro, Philippine Islands (Teleostei: Perciformes: Pseudochromidae). Zootaxa 3140: 49-59.