Sri Lankan flathead (Thysanophrys tricaudata), first described by Knapp, 2013 is a small fish in the family Platycephalidae (order Perciformes). Adults typically reach 11.70 cm in maximum length. It inhabits marine coastal and open-ocean environments. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator. On the IUCN Red List, it is classified as Data Deficient.
Dorsal spines (total): 8; Dorsal soft rays (total): 11; Anal soft rays: 12; Vertebrae: 27. This species of is characterized by the following: no papillae on the upper eye; diagonal scale count 4-5: D fin I,VII, A 11; single preocular and preorbital spines; short snout, its length in HL 3.7-4.0 times; caudal fin with 3 dark bars and a dark saddle crossing back under the entire D1 fin .: elongated.
Behavioural data for Sri Lankan flathead is currently being reviewed.
Marine; reef-associated; depth range ? - 15 m . Tropical Indian Ocean: Sri Lanka.
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