W.H. de Weerdt

Elimination of two reef-building hydrocorals following the 1982-83 El Niño warming event

One probable extinction and one range reduction of eastern Pacific reef-building hydrocoral (Millepora) species mark the first documented cases of species eliminations resulting from the worldwide 1980s coral reef bleaching events. Two of 12 Panamanian coral species were eliminated suddenly from their former ranges by prolonged high sea temperatures during the 1982-83 El Ni�o-Southern Oscillation event. Three conditions contributed to their demise: high sensitivity to sea warming, populations confined to a small geographic area, and bathymetric restriction to the euphotic zone (≤20 meters depth) where El Ni�o sea warming had its greatest effect

The Haplosclerid Sponge Fauna of Banyuls-Sur-Mer (Mediterranean), with the Description of a New Species

The Haplosclerid sponge fauna of Banyuls-sur-mer (Mediterranean) is the subject of this study. Fifteen species were collected among which one is described as new to science, viz. Haliclona griessingeri n.sp. A review of the Haplosclerid fauna of the Banyuls region is given and comparisons with neighbouring areas are made.

A review of North-Eastern Atlantic Hemigellius (Niphatidae, Haplosclerida)

Eight nominal species referable to Hemigellius have been described from the north-eastern Atlantic area, but only two of them are well-established, viz. Hemigellius arcoferus (Vosmaer) and H. pumiceus (Fristedt). The remaining species are either synonyms of these two, or insufficiently documented.