Leptophilypnion is a genus of tiny fishes in the family Eleotridae endemic to the Amazon Basin in South America. At less than in standard length they are the smallest sleeper gobies and among the smallest fish. The larger Microphilypnus sleeper gobies are also found in the Amazon,Caires, R.A. (2013). Microphilypnus tapajosensis, a new species of eleotridid from the Tapajós basin, Brazil (Gobioidei: Eleotrididae). Ichthyological Exploration of Freshwaters, 24 (2): 155–160. and sometimes occur together with Leptophilypnion. The bottom-dwelling Leptophilypnion are typically found in shallow, stagnant or slow-flowing water among soft debris, leaf-litter or water plants.
Species The recognized species in this genus are:Roberts, T.R. (2013): Leptophilypnion, a new genus with two new species of tiny central Amazonian gobioid fishes (Teleostei, Eleotridae). aqua, International Journal of Ichthyology, 19 (2): 85–98. Leptophilypnion fittkaui T. R. Roberts, 2013 Leptophilypnion pusillus T. R. Roberts, 2013
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