SEM of Cathayacanthus spinitruncatus n. sp. from Leiognathus equulus. 37. The markedly decreasing size of posterior hooks and the slight increase in the size of the basal hook in the proboscis of a paratype female. 38. The anterior trunk of a paratype female showing the progressively wider spacing of posterior trunk spines compared with the anterior spines. 39. The enlarged anterior trunk spines and the clear separation of the trunk from the neck in one specimen. 40. A high magnification of a trunk spine at the middle trunk. 41. An area of the mid-trunk cleared from encrusted film of sediment showing the micropores. 42. The posterior end of a female specimen showing its nipple shape. 43. The female genital orifice showing the extension of trunk spines to the posteriormost end of the trunk. 44. A ripe egg.