ハタタテハゼ、アケボノハゼ、シコンハタタテハゼ（ヘルフリッチ） ピンクダートゴビー タンザクハゼ、タンザクハゼ属の１種
Compared to its cousins in Navigobius, this species is identified most readily by the shape and coloration of the dorsal fin, which is relatively tall and deeply incised in comparison to N. dewa, but lacking the dramatic filamentous extensions seen in N. vittatus. A similar fish is also known from aquarium imports that have originated from Bali and the Maldives, but these differ in having a prominent orange band along the midbody. In all likelihood, this is an undescribed Indian Ocean sister species, but we won’t known this for sure until specimens can be studied. Lastly, the recently described N. khanhoa of Vietnam is suggested to actually be a misidentified juvenile of the ribbongoby genus Oxymetopon, due to several morphological discrepancies—the dorsal and anal fins have too many rays… the caudal fin isn’t noticeably lobed… the mouth is protrusible… and apparently its preoperculum has a groove which ought not be there. The authors don’t go so far as to formally synonymize the two, as more specimens are needed to confirm this, but this would leave Navigobius with just three valid taxa in the West Pacific, along with the presumably undescribed Indian Ocean fish. Are there others yet awaiting discovery, or is this really all the Navigobius in the world?
- Gill, A.C., Tea, Y. and Senou, H. (2017) Navigobius kaguya, new species of ptereleotrine goby (Teleostei: Gobiidae) from the West Pacific. Zootaxa 4347 (2): 371–380 https://doi.org/10.11646/zootaxa.4347.2.11