FRESH-WATER FISHES OF SIAM, OR THAILAND 517 



Genus PARAGOBIODON Bleeker 



ParagoUodon Bleekeb (453), Arch. N6erl. Sci. Nat., vol. 9, p. 309, 1874. (Type, 

 Oobitis melanosoma Bleeker=Go6iMS gohiodon Day?) 



The genus Paragohiodon of Bleeker is readily distinguishable from 

 Gobiodon of Bleeker by having the body fully covered with large 

 ctenoid scales. These two genera, with PseudogoModon of Bleeker 

 characterized by the absence of scales and the absence of post-sym- 

 physeal canine teeth, constitute the subfamily Gobiodontinae (phal- 

 anx Gobiodontini of Bleeker, 1874). The oblong-ovate body is com- 

 pressed, the head is obtuse and scaleless, the teeth are pluriserial and 

 simple, the mouth is small and curved, the gill openings are restricted 

 to the side of the head, the dorsal fins are contiguous, with 6 spines in 

 the first dorsal and 9 to 11 branched rays in the second dorsal, the 

 caudal fin is rounded, and the anal has 9 or 10 branched rays. 



PARAGOBIODON KERRI H. M. Smith 

 Paragotiodon kerri Smith, 1931a, p. 42, fig. 20 (Koh Tao). 



This minute but very striking goby remains known only from the 

 type, taken from a small coral head in shallow water on Koh Tao in 

 1928. The body in life was brownish red, darker on back, abdomen 

 pale yellow, head pale crimson, and all the fins except the ventrals 

 were uniformly jet-black, the ventrals being black at base and dusky 

 distally. 



Genus GOBIOPTERUS Bleeker 



Gobiopterus Bleeker (453), Arch. N6erl. Sci. Nat, vol. 9, p. 311, 1874. (Type, 

 Apocryptes hrachypterus Bleeker.) 



The gobies referable to this genus are of very small size, and inhabit 

 fresh and salt lakes, streams, and estuaries in eastern India, Thailand, 

 Malaya, and some East Indian islands. Since Bleeker established the 

 genus for the accommodation of a species {hrachypterus) from Java, 

 very few species have been recognized. The principal generic char- 

 acters are: Transparent body; very oblique, nearly vertical mouth; 

 wide-spaced uniserial conic teeth in both jaws, with a pair of post- 

 symphyseal canines in the lower jaw; bilobate tongue; scaleless head; 

 weak ctenoid scales covering all of the body or only the part posterior 

 to the pectoral base ; 5 spines in the first dorsal fin, 6 to 8 branched 

 rays in the second dorsal, and 7 to 13 branched rays in the anal fin ; 

 ventral fins united into a long, narrow tube. 



Gohiopterus is the only local genus referable to the subfamily Si- 

 cydiinae, as established by Gill in 1860. The action of Koumans 

 (1931) in coining a new subfamily name, Sicydiaphiinae, based on the 

 generic names Sicydium and Aphia, does not seem to have been desir- 



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