The larval and post-larval stages of Gymnammodytes semisquamatus (Jourdain)

In the course of investigations (1955–8) into the Ammodytidae of the south of the Isle of Man, five species of sand eel were identified: Gymnammodytes semisquamatus (Jourdain, 1879), the Smooth Sand Eel; Ammodytes lanceolatus Lesauvage, 1825, the Greater Sand Eel; A. immaculatus Corbin, 1950; A. tobianus Linnaeus, 1758 ( = A. lancea Cuvier), the Lesser Sand Eel; A. marinus Raitt, 1934. Five different types of post-larvae were obtained and investigated. Four of these were the post-larvae of the above four Ammodytes species and the fifth type proved to be Gymnammodytes semisquamatus.