1 st Bioinformatics and Biodiversity Conference Volume 2021 http://dx.doi.org/10.11594/nstp.2021.0703 How to cite: Cahyadi, G. A. B. Y. P., Pinasti, R., & Salwa, A et al. (2021). Biodiversity of gastropods in intertidal zone of Krakal Beach, Gunungkidul, Yogyakarta. 1 st Bioinformatics and Biodiversity Conference. NST Proceedings. pages 16-24. doi: 10.11594/ nstp.2021.0703 Conference Paper Biodiversity of Gastropods in Intertidal Zone of Krakal Beach, Gunungkidul, Yogyakarta G. A. B. Y. P. Cahyadi, Ragil Pinasti, Assyafiya Salwa, Maghfira Aulia Devi, Lutfiyah Rizqi Fajriana, Nila Qudsiyati, Pinkan Calista, Rury Eprilurahman* Faculty of Biology, Gadjah Mada University, Jl. Teknika Selatan, Sekip Utara, Yogyakarta, 55281, Indonesia *Corresponding author: ABSTRACT Krakal Beach is located in Gunungkidul Regency, Yogyakarta Special Region. This beach is built by coral reefs. The coral reef is an ecosystem that can sup- port various biota to live on it by being a habitat for many species, such as Molluscs. Mollusc is the phylum that has the most members after Arthropods. Approximately 60,000 living species and 15,000 fossil species belong to Mol- lusc. The phylum Mollusc is divided into seven classes, one of which is Gas- tropods. Gastropods are Molluscs that move with their abdominal muscles. Molluscs are so diverse, so this research is aimed to study the biodiversity of Molluscs in the intertidal zone of Krakal beach, Gunungkidul, Yogyakarta. The research was conducted on October 4th, 2019 at 03.10 WIB. The research held when ecological parameters were ±21.3 o C for water temperature, ±3.6% for salinity, and 7.5 for pH. The samples were collected using a purposive sampling method, preserved by using a dry preservation method, and identi- fied by determining the morphological characteristics of the shell and re- ferred to many references. This study found 7 families from the class Gastro- pod in the intertidal zone of Krakal beach, those are Aplustridae, Conidae, Cypraeidae, Mitridae, Muricidae, Nacellidae, and Turbinidae. Keywords: Biodiversity, Gastropod, Krakal, Mollusc E-mail: rurybiougm@ugm.ac.id Introduction Indonesia is an archipelagic country. As an archipelagic country, Indonesia’s territory stretched from 6°N to 10°S and from 95°E to 142°E, consists of 18,110 islands with 108,920 km coastline (Hutomo & Moosa, 2005). Krakal Beach is located in Gunungkidul Regency, Yogyakarta Special Region. This beach is built by coral reefs. A coral reef is an ecosystem that can support various biota to live on it by being a habitat for many species, such as Molluscs (Bolam et al. 2002). Mollusc is the phylum that has the most members after Arthropods. Approximately 60,000 living species and 15,000 fossil species belong to Mollusc (Brusca & Brusca, 1990). Molluscs are so diverse. They have conquered all habitats in the sea such as intertidal, littoral zone, even deep-sea hydrothermal vents. They also can be found in freshwater environments and land (Haszprunar & Wanninger, 2012). Mollusc has diverse body shapes. Based on the body shape and the number of the shells, molluscs are classified into seven different classes: Aplacophora, Monoplacophora. Polyplacophora, Gastropods, Bivalves, Scaphopoda, and Cephalopod (Moore, 1960). Gastropods are Molluscs that move with their abdominal muscles (Houart, 2010). Also, biodiversity, abundance, and density of Molluscs in the intertidal zone can be used as a reference of the ecological quality in a certain area. This research aims to study the biodiversity of Molluscs in the intertidal zone of Krakal beach, Gunungkidul, Yogyakarta. Yogyakarta.