About Priapichthys annectens (Regan, 1907)
Priapichthys annectens has black margins along the edges of its body scales, which form a cross-hatched pattern across the body. This pattern is denser along the center of the flanks, and can appear as a series of X-shaped markings running along the length of the body. The flanks bear between 6 and 12 vertical bars, whose intensity varies based on the individual's locality. At the base of the dorsal fin, there are elongated black blotches. The anterior rays of the anal fin are orange, and all other fins are colorless. The eyes and cheeks have a silvery-green tint. This species has an elongated, cylindrical-bodied shape. Males reach a maximum total length of 4 cm (1.6 in), while females reach a maximum total length of 6.5 cm (2.6 in).
Priapichthys annectens is distributed across southern Nicaragua, Costa Rica, and western Panama within its drainage basin. It occurs from the Lake Nicaragua drainage, across both the Atlantic and Pacific slopes of Costa Rica, and extends into the Atlantic slope of western Panama. It inhabits small streams with variable current, and lives over sand or stony substrates in waters with a range of temperatures.
