Parasitic copepods (Copepoda : Siphonostomatoida) from deep-sea and mid-water fishes

The stages in the metamorphosis of the pennellid Cardiodectes medusaeus (Wi lson) are described from mid-water fishes in the Indo-Pacific. The earliest metamorphic stage was found within the body cavity of the second host and indicates a double origin for the frontal processes of the cephalic holdfas t in this species. A new species of Lophoura (family Sphyriidae) is describ ed from a single female taken from a deep-water synaphobranchid eel caught in the North Atlantic. The new species, L. simplex, is characterised by the lack of any neck processes. Another sphyriid, Periplexis lobodes Wilson, i s reported for the second time. It was found on a deep-sea alepocephalid be longing to the genus Rouleina in Fijian waters.