Species of the genus Grallenia are unique among gobiids in possessing a combination of 15 segmented caudal-fin rays, a greatly reduced papilla row e, and a pair of characteristic diagonal black markings at the base of the caudal fin (Shibukawa & Iwata 2007). The most useful features for separating the various species include the number of dorsal- and anal-fin rays, patterns of body scalation, dorsal-fin shape, and the presence or absence of cephalic sensory-canal pores and a filamentous extension of the first dorsal-fin spine (Allen & Erdmann 2017).
Author: Bray, D.J. 2017
Cite this page as:
Bray, D.J. 2017, Grallenia in Fishes of Australia, accessed 22 May 2018, http://fishesofaustralia.net.au/Home/genus/602
Allen, G.R. & Erdmann, M.V. (2017) Description of five new species of marine gobies (Teleostei: Gobiidae) of the genus Grallenia from the tropical western Pacific Ocean. Journal of the Ocean Science Foundation 27: 20–47. doi: http://dx.doi.org/10.5281/zenodo.842879 PDF available, Open access
Shibukawa, K. & Iwata, A. (2007) Grallenia, a new goby genus from the western Pacific, with descriptions of two new species (Perciformes: Gobiidae: Gobiinae). Bulletin of the National Museum of Nature and Science, Series A, Supplement 1: 123–136.