الفهرس 
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Abstract
Sixty-three invertebrate species (19 foraminifers, 4 bryozoans, 20 gastropods and 20 bivalves) from four lagoons along the Red Sea coast have been identified, illustrated and their habitat, bio-and-paleogeographic distribution (if present) were done. They belong to 48 genera and 34 families. The habitat of the recorded fauna indicated that they belong to Indo-Pacific affinity and few of them also have Mediterranean-Atlantic one. There is a relationship between the faunal diversity and the geochemistry of the studied lagoons. In Um El-Howitat lagoon, where the highest heavy metals content, and the total phosphorous content are recorded, it shows the relatively low diversity and also low total organic matter. On the other hand, in Abu Galawa lagoon – and to some extent Marsa El Shuni lagoon-, the lowest heavy metals content is recorded, and the highest relative diversity and carbonate content is also observed.