Diversity of Sea Stars (Asteroidea) in Baluran National Park Bilik Beach Intertidal Zone As a Source of Learning Biology

Starfish (Asteroidea) is one of the biota that make up Bilik Beach, Baluran National Park. The aim of the research was to determine the diversity of starfish species (Asteroidea) in the intertidal zone of Bilik Beach, Baluran National Park, Situbondo Regency, East Java. The research method used is survey method. Data collection was carried out by site surveys, determining research locations, sampling, observing, and identifying species. Sampling was carried out when the seawater reached its maximum ebb. The research location uses 3 stations with location points that represent the area of Bilik Beach. Sampling used transect plotting technique with a total of 3 transects at each station. Based on the research results, 2 types of starfish (Asteroidea) were found, namely Linckia laevigata and Archaster typicus. The results of the calculation of the diversity index of starfish (Asteroidea) found on Bilik Beach are 0.44 which is relatively low. The findings of sea stars are used as a learning resource in the form of popular scientific books.