Eleotridae

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Eleotridae

 

a family of littoral and fresh-water fishes of the suborder Gobidae (gobies). Unlike members of the other goby families, the fish do not have concresced ventral fins. The family embraces approximately 60 species, which are found in tropical and subtropical waters. A single species, the Chinese sleeper (Perccottus glehni), is found in the USSR, in the Amur River basin and the Primor’e region. In recent years, the Chinese sleeper has spread to the European part of the USSR and to Middle Asia. It is easy to catch with a fishing pole.

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These institutions have numerous specimens of small Amazonian eleotrids, many of them less than 10 mm standard length, but apparently all are Microphilypnus.
The only eleotrids hitherto known from the interior of the Amazon basin belong to the genus Microphilypnus Myers 1927, and also are quite small.
Diagnosis: Leptophilypnion differs from all other eleotrids in its extremely small size (all known specimens less than 10 mm standard length) and in having only 5 instead of 6 branchiostegal rays.
Its cephalic laterosensory canal system is among the most reduced observed in eleotrids.
Cephalic neuromasts usually are readily visible in gobiids and eleotrids including Microphilypnus and Leptophilypnus and their pattern may be helpful in recognition of taxa and their classification.
Compared to the cephalic neuromasts of Microphilypnus, Leptophilypnus, and other eleotrids, those of Leptophilypnion are much fewer and less organized.