Newly discovered habitat of a threatened goby, Acanthogobius insularis (Perciformes: Gobiidae), in southern part of Okinawa-jima Island, Japan

Acanthogobius insularis Shibukawa and Taki (1996) is a threatened goby species, previously known to be restricted to estuaries on Amami-oshima Island and northern part of Okinawa-jima Island. However, we found this species in two estuaries in the southern part of Okinawa-jima Island (Toyosaki and Manko), which are separated from their habitats in the northern part of the island by approx. 60 km of coral reefs. Morphologies of four specimens collected in Toyosaki and Manko examined in the present study correspond to the original description of A. insularis. This study reports that Toyosaki is the southernmost habitat of this species based on specimens. Because it is thought that A. insularis move to unknown spawning habitats in winter and because only one individual has been found in Manko, it is necessary to understand the habitats that these newly discovered small populations use, in their entirety

Two new species of Rhinogobius (Gobiiformes: Oxudercidae) from Palawan, Philippines, with their phylogenetic placement

Two new species of Rhinogobius found in streams on central part of Palawan Island, Philippines are described. The two new species, Rhinogobius estrellae and Rhinogobius tandikan share unique transverse rows of sensory papillae on the cheek with Rhinogobius similis Gill, 1859, but differ from the latter in fin ray counts, arrangement of the scales, etc. The two new species are distinguished from each other by the pectoral-fin ray count, the longitudinal- and predorsal-scale counts, and colouration of the body. Rhinogobius estrellae new species and R. tandikan new species have been found allopatrically in a stream within Malatgao River system flowing into the Sulu Sea and in the Cayulo River flowing into the South China Sea, respectively. The Malatgao River system is the southernmost habitat of the genus Rhinogobius. Rhinogobius similis had been considered as the only member of the most basal lineage of this genus, but our mitochondrial genome analysis suggested that the two new species are additional members of this lineage. They are considered to be relicts of their common ancestor with R. similis, which probably had a wider distribution.journal articl

Studies on geographic variations and factors affecting the community structuring mechanism for fish assemblages in tide pools of tidal flats in Ryukyu Archipelago.

博士(理学)琉球大

Fig. 4 in Correction

Fig. 4. Map showing the sites where Acentrogobius ocyurus has been recorded (corrected).Published as part of Kunishima, Taiga, Palla, Herminie P., Tachihara, Katsunori & Maeda, Ken, 2022, Correction, pp. 129-138 in Species Diversity 27 (27) on page 129, DOI: 10.12782/specdiv.27.347, http://zenodo.org/record/754480

Do colour-morphs of an amphidromous goby represent different species? Taxonomy of Lentipes (Gobiiformes) from Japan and Palawan, Philippines, with phylogenomic approaches

We document four male colour morphs of the Indo-Pacific goby genus Lentipes in Japan and the Philippines. Despite distinctive colour patterns, males of the different morphs could not be distinguished by meristic or morphometric characters. In contrast, co-occurring females had very similar colouration and could not be sorted into different types. We observed that the four types are not distinguished by mitochondrial genome sequences. On the other hand, genome-wide SNPs analysis clearly separated the four types, suggesting that they indeed represent four independent lineages. We considered that the four lineages could have diverged recently, and therefore, the sorting of mitochondrial haplotypes may not have been completed yet. One of the four lineages is identified as L. armatus Sakai & Nakamura, 1979, and the other three are described in this study as new species: L. kijimuna sp. nov., L. bunagaya sp. nov., and L. palawanirufus sp. nov. We observed that males display their species-specific body colourations during courtship. Pre-zygotic isolation due to female preferences for different male body colours is probably the primary mechanism of reproductive isolation between the four species