Tetrancistrum obesum Caballero, Bravo-Hollis, and Grocott, 1955

Kritsky, Delane C., Galli, Paolo & Tingbao, Yang, 2007, Dactylogyrids (Monogenoidea) parasitizing the gills of spinefoots (Teleostei, Siganidae): revision of Tetrancistrum Goto and Kikuchi, 1917, with descriptions of two new species from Siganus spp. of the Red Sea and Celebes, Journal of Natural History 41 (25 - 28), pp. 1513-1551 : 1545

Tetrancistrum obesum Caballero, Bravo-Hollis, and Grocott, 1955

This species was originally described from the gills of Tetraodon hispidus Linnaeus (Tetraondontidae) in Panama by Caballero et al. (1955). Young (1968), who provided drawings of the species from Australian waters, transferred it to Haliotrema as H. obesa (Caballero, Bravo-Hollis, and Grocott, 1955) Young, 1968 based on the presence of the vas deferens looping the left intestinal caecum and on the general shape of the body. Although Caballero et al. (1955) did not depict the copulatory complex of T. obesum , the general body shape and basic morphology of the haptoral armament suggest that the species belongs in Thylacicleidus Wheeler and Klassen, 1988 (see Řehulková and Gelnar 2005). However, transfer of T. obesum to the latter genus is not made, pending further study of the parasite from Panama. The species is retained in Haliotrema as originally proposed by Young (1968).