Revision of the monogenean subfamily Thoracocotylinae Price, 1936 (Polyopisthocotylea : Thoracocotylidae), with the description of a new species of the genus Pseudothoracocotyla Yamaguti, 1963

Members of the subfamily Thoracocotylinae are gastrocotylid monogeneans of Spanish mackerels (scombrid fishes of the genus Scomberomorus) from warm to warm-temperate seas around the world. We revise the diagnosis of the subfa mily and recognise two genera and three species as valid. The genus Paradaw esia Bravo Hollis & Lamothe Argumedo, 1976 is synonymised with Thoracocotyl e MacCallum, 1913, and Dawesia Unnithan, 1965 and Methoracocotyle Lebedev, 1984 are synonymised with Pseudothoracocotyla Yamaguti, 1963. Thoracocotyle crocea MacCallum, 1913 (syns T. paradoxica Meserve, 1938 and Paradawesia b ychowskyi Bravo Hollis & Lamothe Argumedo, 1976) is recorded from two speci es of Scomberomorus in the eastern Pacific (California to Peru) and four in the western Atlantic (South Carolina to Brazil). Pseudothoracocotyla ovali s (Tripathi, 1956) Yamaguti, 1963 (new syns Dawesia indica Unnithan, 1965, D. incisa Lebedev, 1970, Methoracocotyle scomberomori (Young, 1968) Lebedev , 1984, M. gigantica (Rohde, 1976) Lebedev, 1984 and Thoracotyle indica (Un nithan, 1965) Murugesh, 1995) is recorded from the gills of seven species o f Scomberomorus from the Indo-west Pacific (eastern South Africa north to t he Persian Gulf, and east to Fiji). Pseudothoracocotyla whittingtoni n. sp. is described from an eighth Indo-west Pacific scomberomorid, S. munroi, in Australian waters.