Abstract
In 1834, when F. Eydoux originally described Gelasimus tangeri (family Ocypodidae), the species was abundant in the vicinity of Tangier. It is only now recorded from the type locality for the second time. Only two males and one female were collected near the mouth of Oued el Melaleh although the habitat seems quite suitable for a Uca colony. The reason for this drastic reduction in the population appears to be as follows: Owing to the formation of sandy stietches, leading eventually to the closure of the river mouth, the free interchange of water between river and sea, so essential for the development of the larvae and the maintenance of the adult population, is severely curtailed. The final extinction of the colony is only a matter of a few years.
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