Diversity of Platyhelminthes, Xenacoelomorpha, Nematoda, Acanthocephala, Brachiopoda, Kinorhyncha, Nemertea, Chaetognatha, Tardigrada, Gastrotricha, Rotifera, Phoronida, Echinodermata and Chordata (Tunicata, Cephalochordata and Hemichordata) from the

The current biodiversity of 14 phyla, namely Platyhelminthes, Xenacoelomorpha, Nematoda, Acanthocephala, Brachiopoda,Kinorhyncha, Nemertea, Chaetognatha, Tardigrada, Gastrotricha, Rotifera, Phoronida, Echinodermata, and Chordata (invertebratesonly, including the subphyla Tunicata, Cephalochordata, and Hemichordata) from the coasts of Türkiye is revisited. It was found thata total number of 695 species occur along all the coastlines of Türkiye, with the Black Sea being represented by 297 species, the Sea ofMarmara by 305 species, the Aegean Sea by 308 species, and the Levantine Sea by 204 species. The most species-rich phyla in theseregions were Platyhelminthes (249 species), Nematoda (131), Echinodermata (98), and Chordata (85). A total of 26 alien species havebeen reported from the regions to date, of which one species belongs to Chaetognatha, 8 species to Echinodermata, and 17 species toTunicata. The highest number of alien species (17) was encountered in the Levantine Sea and the lowest (2) was in the Black Sea.