Eugnathogobius Smith 1931
Creators: name: Larson, Helen K.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Perciformes
Gobiidae
Eugnathogobius

description: KEY TO SPECIES OF EUGNATHOGOBIUS   
1 Segmented caudal fin rays 16.............................................. 3  
– Segmented caudal fin rays 17.............................................. 2  
 2 Caudal fin pale, conspicuously barred with dark pigment, five elongate black or brown blotches along midside of body; headpores present; lateral scales 22–24...................................................................................... E. siamensis (Fowler, 1934) (Thailand, Malaysia, Singapore, Borneo)   
 – Caudal fin plain greyish to translucent, darker at base, side of body without brown blotches or bars; no distinct elongate dark blotches along midside of body; headpores absent; lateral scales 24–27................... E. microps Smith, 1931 (Thailand)   
 3 Upper jaw teeth in single row, teeth compressed and even in height, with tips pointed, indented and bent to one side, lower jaw teeth conical, pointed......... E. variegatus (Peters, 1869) (Thailand, Singapore, Indonesia, Papua New Guinea)   
– Upper jaw teeth in at least two rows, all teeth conical and pointed.................................................................................. 4  
4 Lateral scales 27–39; headpores present or absent; first dorsal fin spines always VI; all fins well-developed..................... 6  
– Lateral scales 48–63; headpores always absent; first dorsal fin spines VI, V or less; fish small and slender with very low fins........................................................................................ 5  
 5 Back and upper sides with small distinct black spots in both sexes, no distinct black spot on upper base of caudal fin; nape always naked; first dorsal fin spines V or fewer.............................. E. stictos, new species (Northern Territory, Australia)   
 – Body indistinctly mottled, males with black spot on upper base of caudal fin; predorsal scales modally absent, may be 2-16 present; first dorsal fin spines VI, rarely V.............................................................................. E. polylepis (Wu & Ni, 1985) (China, Taiwan, Malaysia, Singapore, northern Australia)   
 6 Headpores always absent; jaws greatly enlarged in males; head with at least two dark stripes, each body scale with fine brown bar or spot....................................... E. kabilia (Herre, 1940) (Thailand, Malaysia, the Philippines)   
– Headpores present or absent; jaw length not greatly dissimilar between males and females; body with small but distinct brown or blackish spots and mottling............................................. 7  
 7 All nape scales small and equal in size, reaching forward as far as over preopercular margin, but not reaching to behind eyes; headpores always absent; about 10 narrow bars or saddles across dorsum, side of body with dark stripe along midline; no distinctive bars or stripes on face............................................. E. indicus new species (Kenya, Mozambique, Aldabra)   
– Nape scales reaching forward to close behind eyes, anteriormost scale often enlarged; headpores present or absent; dark stripes or broad dusky bars present on snout and/or side of head.................................................................................................... 8  
 8 First three dorsal spines often elongate in males; four to five oblique dark brown lines cross side of head; headpores modally absent; anteriormost nape scale enlarged, occasionally all nape scales small, equal in size............. E. mindora (Herre, 1945) (Fiji, Queensland, the Philippines, Thailand)   
 – No dorsal spines elongate in males, second or third spine longest; two or three broad irregular dusky bands cross snout and cheek; headpores modally present; anteriormost nape scale often enlarged..................................... E. illotus Larson 1999 (Thailand, Singapore, Brunei, the Philippines)
description: Published as part of Larson, Helen K., 2009, Review Of The Gobiid Fish Genera Eugnathogobius And Pseudogobiopsis (Gobioidei: Gobiidae: Gobionellinae), With Descriptions Of Three New Species, pp. 127-181 in Raffles Bulletin of Zoology 57 (1) on pages 132-133, DOI: 10.5281/zenodo.5341767