Freshwater habitats in Indo-Pacific tropical islands are mainly inhabited by amphidromous fish, which display a marine larval phase while the rest of their life cycle takes place in rivers. Gobiiformes are the most diversified fish component in these ecosystems. In this study, we focused on the status of the widespread Stenogobius genus (Gobioidei). This genus is distributed from the Indian Ocean to French Polynesia. Recently, a first revision of Stenogobius was undertaken leading to the redescription of Stenogobius genivittatus (Valenciennes, 1837) and the placement of 12 species names as synonyms of Stenogobius genivittatus. This paper focuses on the status of nine Stenogobius species supposedly existing in Indonesia, a country well known as one of the freshwater hotspot of biodiversity. The present study is based on 95 specimens, and includes morpho-meristic data and partial mitochondrial COI sequences. Our results show that, at least, four species occur in Indonesia, including the widespread species, Stenogobius genivittatus.

Sulawesi is the largest island in the Wallacea biodiversity hotspot. However, data on the ichthyofauna of this island are incomplete, and several known species do not have reference DNA barcodes in public databases; these are necessary, inter alia, to enable non-invasive environmental DNA detection. As a contribution ttowards filling this gap, specimens of two species endemic to South Sulawesi were collected from the Maros karst region in March 2023: Dermogenys orientalis and Lagusia micracanthus. Right pectoral fins were preserved in 96% ethanol for DNA barcoding before preservation of three voucher specimens from each species at Hasanuddin University. DNA extraction and PCR (COI mitochondrial genetic marker) was followed by Sanger sequencing. Data analysis was conducted in MEGA 11. These first barcodes were deposited in GenBank: Dermogenys orientalis accessions OR829330- OR829332 and Lagusia micracanthus accessions OR829336- OR829336. Phylogenetic trees were constructed using homologous sequences obtained through the NCBI GenBank BLASTn routine.

Abstract. – We describe a new species of the fossil perciform genus Dapalis (Ambassidae), Dapalis pauciserratus n. sp., based on two articulated skeletons with otoliths in situ from the lower Oligocene of Raljin/Strelac, Babušnica basin, Southern Serbia. This species differs from congeners in the combination of following characters: (i) body elongate, fusiform; (ii) head triangular in shape; (iii) supraoccipital crest distinct; (iv) head without serrations except two large spine-like serrations on the corner of the preopercle; (v) premaxilla with a relatively narrow postmaxillary process located in the distal half; (vi) spines of the first and second dorsal fins, the anal fin and the pelvic fin strong but not massive; (vii) first spine of first dorsal fin long (42% of length of second spine); (viii) otoliths elongate (length : height = 1.4) with a narrow and elongate ostium, indistinct antirostrum, shallow excisura and an asymmetric and prominent rostrum.