The first report of Charybdis goaensis Padate, Rivonker, Anil, Sawant & Krishnamurthy, 2010 was from Goa, India in 2010 year. Its occurrence in Indonesia is the second report in the world. The samples were harvested by a fisherman in Sibolga city and Natal district-Mandailing Natal Regency, North Sumatera. We recorded three males and ten females of Charybdis goaensis, which consists of juveniles and ovigerous females. Both sampling locations are in one coastline in west coast Sumatera which faces directly to the Indian Ocean. We assumed that the dispersal of this species through the Indian Ocean is at their larval phase.
Abstract. Lubis K, Sudibyo M, Farajallah A, Hanim N. 2020. Short Communication: The mitochondrial cytochrome c oxidase subunit I (COI) for identification of batoids collected from landing sites in Medan, Indonesia. Biodiversitas 21: 5414-5421. Batoids are member of Elsamoranch subclass which consist of many species. Most of batoids species are overexploited, especially in Medan Indonesia. Up to presents, the information about diversity of rays on the east coast of North Sumatra, Indonesia was very limited. Therefore, this research aimed to investigate the diversity of rays on the east coast of North Sumatra. We examined the morphological trait of 82 individuals of batoid from three landing sites on the east coast of North Sumatra, namely: Tanjung Balai, Belawan, and Percut, then identify its species based on determination key. After that, we collected pectoral muscle tissue from an individual in each species which successfully identified to extract its genomic DNA. Molecular based identification was carried out by using DNA fragment form COI gene. The successfully amplificated COI gene DNA fragment then was sequenced and analyzed. Based on morphological trait, we successfully identifying nine species of batoid, which is Maculabatis gerrardi, Gymnura poecilura, Dasyatis zugei, Brevitrygon heterura, Neotrygon kuhlii, Hemitrygon bennettii, Rhinobatos jimbaranensis, Rhinoptera javanica, and Taeniura lymma. The result of identification based on COI gene DNA fragment was in congruent with morphological-based identification based on data BLAST-N and genetic distance value within same species. The nucleotide diversity within same species ranged from 0-15 nucleotide variants.
Brachyuran is an important biotic component in marine ecosystems, and is known as a keystone species. Information about brachyuran species in Indonesia, in this case from Seribu Islands-Jakarta, is still limited, especially for the non-economic crabs. Based on the manual sampling, it was found that there are four crabs that have not been reported from the Islands, i.e. Ozius guttatus, Carpilius maculatus, Gelasimus hesperiae, and Etisus laevimanus. In term of ecological point of view, the Islands are influenced by the Jakarta Bay as food provider for supporting the live of brachyuran crab. Crab database is necessary to increase the utilization of crabs in the future, e.g. as antibacterial activity and the sources of chitin and chitosan.
All previous reports of the genus Emerita from Indonesia have only identified one species, namely Emerita emeritus, which was found on the west coast of Sumatera and the south and northern coast of Java. Previous studies expected that other species, related to Emerita emeritus, should be found in southern Java.
We report a new species of Emerita, which was found on Pangandaran Beach, in an intertidal area, within the southern beach of Java, near Citonjong Estuary. We compared the specimen from a nearby location, that is from Cilacap and the collection of Emerita emeritus from Bengkulu. Here, we describe and illustrate the species.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.