Keanekaragaman fauna banyak ditemukan di ekosistem pesisir. Salah satu Filum yang memiliki daya tarik tersendiri di lingkungan pesisir yaitu Echinodermata. Berdasarkan informasi dan data yang diperoleh, di Pantai Basaan Satu Kecamatan Ratatotok Sulawesi Utara belum pernah ada penelitian Echinodermata sebelumnya. Pengambilan sampel menggunakan metode Purposive Random Sampling dan metode kuadrat. Hasil Penelitian didapatkan 13 spesies Echinodermata yaitu kelas Asteroidea diwakili oleh Linckia laevigata, Protoreaster nodosus dan Nardoa tuberculata. Ophiomastix annulosa termasuk pada kelas Ophiuroidea. Kelas Echinoidea diwakili oleh Diadema setosum, Tripneustes gratilla, Echinometra mathaei, Echinothrix diadema dan Echinothrix calamaris. Kelas Holothuroidea diwakili oleh Synapta maculata, Holothuria atra, Holothuria scabra dan Bohadschia marmmota. Indeks keanekaragaman Echinodermata sedang ditemukan pada habitat mangrove yaitu H'=1,21 dan habitat terumbu karang H'=1,97, sedangkan pada habitat padang lamun indeks keanekaragamannya rendah dengan H'=0,88.The animal diversity can be found in beach-side ecosystem. One of animal phylum wich has its own uniqueness is Echinoderms. According to the information and data, in Basaan Satu beach, Ratatotok district, North Sulawesi, there’s no research related to Echinoderms has been done there yet. Method used in sampling was Purposive Random Sampling and square method. In this research, 13 species of Echinoderms were found. They are Linckia laevigata, Protoreaster nodosus and Nardoa tuberculata from Asteroidea class. Ophiomastix annulosa from Ophiuroidea class. Diadema setosum, Tripneustes gratilla, Echinometra mathaei, Echinothrix diadema and Echinothrix calamaris from Echinoidea class. Synapta maculata, Holothuria atra, Holothuria scabra and Bohadschia marmmota from Holothuroidea class. Diversity index of Echinoderms in mangrove habitat and coral habitat are moderate (H'=1,21 and H'=1,97, respectively), while in seagrass habitat it is low (H'=0,88).
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