Encyonopsis indonesica sp. nov. (Bacillariophyceae, Cymbellales), a new diatom from the ancient lake Matano (Sulawesi, Indonesia)

A new species, Encyonopsis indonesica, is described from the ancient lake Matano, Sulawesi island, Indonesia. The morphology of this species was studied by means of light and scanning electron microscopy. E. indonesica has a remarkable valve ultrastructure. The valve surface is ornamented with numerous longitudinal siliceous ribs and siliceous verrucae. Valve face delineated from the mantle by a thickened marginal ridge. Raised sterna border the raphe branches. Raphe is distinctly undulate with distal ends hooked strongly to the ventral side. The only similar species to E. indonesica is Amphora dissimilis described from New Caledonia. Comparison of both taxa is given and A. dissimilis is transferred to Encyonopsis. The taxonomic placement of both taxa is evaluated, and the phenomenon of external siliceous ornamentation is discussed.

Pertumbuhan dan Mortalitas Ikan Endemik Opudi (Telmatherina prognatha Kottelat, 1991) di Danau Matano, Sulawesi Selatan

Lake Matano is an ancient lake that has a high endemicity. Opudi fish (Telmatherina prognatha) is an endemic fish that is vulnerable to extinction and needs to be preserved. The threat of invasive species and habitat degradation can cause a decrease in opudi fish populations. This study aimed to examine the growth parameters associated with growth coefficients and mortality in Lake Matano so that population can be sustainable. The study was conducted at Lake Matano from March 2018 to February 2019. Samples of fish were caught using a net bag measuring 30 m long, 2 m wide with a mesh size of 0.5 inches. Analysis of fish growth was based on total length-frequency data. These data were analyzed using the FISAT II software. The sizes of male and female opudi fish obtained ranged from 30-70 mm. Growth patterns of von Bertalanffy butina in male fish are male Lt = 76.50 [1-e-0.46 (t + 0.47)] and female fish Lt = 74.05 [1-e-0.51 (t + 0.52)]. The total mortality value of male fish was higher (Z = 1.65) compared to female fish (Z = 1.50), the natural mortality value of male opudi fish was lower (M = 0.84) compared to that of female fish (M = 0.91). Keywords: endemic fish, growth, mortality, Telmatherina prognatha

ARKEOLOGI BAWAH AIR: TEMUAN TEMBIKAR SITUS TERENDAM DI DANAU MATANO, SULAWESI SELATAN

Underwater archaeological research usually talks about archaeological remains under the sea like a sinking ship. The issue of sinking ships concerns the cargo, the type of ship, shipping lines, trade routes, and the origin and technology of shipbuilding. The problem is that archeological findings are not only in the sea, but also in lakes, swamps, or rivers. Therefore underwater archeology not only studies archeological findings in the sea but also on the lake. Archaeological findings originating from within the Matano lake include in the form of pottery both intact and fractions mixed with metal objects. Lake Matano located in Luwu Regency in South Sulawesi is an ancient lake and is the deepest lake in Southeast Asia. How and why these pottery findings arrived inside the lake, are the problems that will be answered in this study. The aim is to find out the function and role of pottery in the sites of Lake Matano and what factors influence it. With the method of inductive reasoning and underwater exploration and land and an analogy with the findings of similar pottery in the terrestrial area of the lake, we can find a connection between the findings of pottery and the same activities related to the manufacture of metal objects, and strong suspicion of tectonic activity that affects the site's existence.Keywords: Pottery, Underwater, Terrestrial, Metal, Lake MatanoAbstrak. Penelitian arkeologi bawah air biasanya berbicara tentang tinggalan arkeologi di bawah laut seperti kapal tenggelam. Isu kapal tenggelam ini menyangkut tentang muatan, jenis kapal, jalur pelayaran, jalur perdagangan, dan asal muasal dan teknologi pembuatan kapal. Permasalahannya, temuan arkeologi tidak saja berada di dalam laut, tetapi juga terdapat di perairan danau, rawa, ataupun sungai. Oleh karena itu, arkeologi bawah air tidak saja mempelajari temuan arkeologi di dalam laut, tetapi juga di danau. Temuan arkeologi yang berasal dari dalam Danau Matano antara lain berupa tembikar, baik utuh maupun pecahan yang bercampur dengan benda logam. Danau Matano yang terletak di Kabupaten Luwu di Sulawesi Selatan adalah danau purba dan merupakan danau terdalam di Asia Tenggara. Bagaimana dan mengapa temuan tembikar ini sampai berada di dalam danau adalah permasalahan yang hendak dijawab dalam penelitian ini. Tujuannya adalah untuk mengetahui fungsi dan peran keberadaan tembikar di situs-situs Danau Matano dan faktor-faktor apa yang mempengaruhinya. Dengan metode penalaran induktif dan ekplorasi bawah air dan daratan serta analogi dengan temuan tembikar serupa di area terrestrial danau dapat diketahui adanya hubungan antara temuan tembikar dengan aktivitas yang sama berkaitan dengan pembuatan benda logam, dan dugaan kuat adanya aktivitas tektonik yang mempengaruhi keberadaan situs.Kata kunci: Tembikar, Bawah air, Terrestrial, logam, Danau Matano