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. Um El-Howitat lagoon sediments are enriched in Fe, Mg, Pb, Co and Cu that attributed to the anthropogenic inputs, and recorded the highest total phosphorous content coming from the phosphate shipping in Abu Tartour harbor, in addition to the domestic and sewage materials from the coastal activities. Marsa El Shuni lagoon recorded the lowest content of total phosphorous and the highest content of Zn, Ni and Cd attributed to the natural inputs from Shuni Valley. Abu Sha´ar lagoon recorded the highest total organic matter content, indicating the influx of terrigenous materials. Abu Galawa lagoon recorded the highest carbonate content and the lowest heavy metals content due to the dominance of biogenic sediments from surrounding coral reefs and the absence of terrigenous influx. 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.