Family LACISTORHYNCHIDAE Guiart, 1927
Introduction
The recent redefinition of the family by Campbell & Beveridge (1994) restricts it to three well known genera, Callitetrarhynchus, Floriceps and Lacistorhynchus. The family is characterised by two bothridia and the possession of a chainette on the external surface of the tentacle. There are six hooks in each principal row, with the sixth hook displaced anteriorly; hooks seven and eight form a linear array, in which hook eight is termed a 'satellite' of hook seven, and the chainette is formed by the ninth hooks from each side of the tentacle. In addition, the male and female genital ducts unite to form an hermaphroditic duct.
The adults occur in the spiral valves of a variety of shark families while the larval stages or plerocerci are found in the abdominal cavity or in the liver of teleosts. All three genera are recorded from Australian waters, represented by four species.
General References
Campbell, R.A. & Beveridge, I. 1994. Order Trypanorhyncha Diesing, 1863. pp. 51-148 in Khalil, L.F., Jones, A. & Bray, R.A. (eds). Keys to the Cestode Parasites of Vertebrates. Wallingford, UK : Commonwealth Agriculture Bureaux International 751 pp.