Family Eleotridae Bonaparte 1835 (Fig. 3I). Sleepers, Spinycheek Sleepers, Gudgeons; Guavinas, Dormilones, Chupapiedras

Description: Body elongate, stout; up to 60 cm in length, usually less than 20 cm; head short, broad; snout blunt; mouth usually terminal, never inferior; lateral line absent, but canals and pores on head presents; pelvic fins separate (no sucking disc); two separate dorsal fins, the first with 6–7 weak spines, the second with one weak spine and 6–12 rays (Robertson & Allen 2015, Nelson et al. 2016). Distribution: Marine, brackish and freshwater; most tropical and subtropical areas (rarely temperate areas) (Nelson et al. 2016). Seven genera and fourteen species in Nicaraguan freshwaters.