I found Polymerurus squammofurcatus between decomposing plant masses in the Simmelried. The species is fast swimming, very mobile and flexible. The specimens of my populations were up to 480 µm long and thus about 150 µm longer than previously described. The species has been found rarely and the available descriptions are not complete. For example, the exact shape of the dorsal and ventral scales has not been described in detail so far. According to my observations the dorsal scales of the neck region are about 4 – 5 µm long (s. fig. 5) and about 10 µm long in the mod-body region (s. figs. 6 and 7). The anterior margin of them is rounded and the posterior margin is incised in a U-shape. At the posterior end, there is a field of spine-free scales on the dorsal side (s. fig. 12), but they are keeled. The ventral scales on average 18 µm wide and 7 µm high (s. figs. 13 and 14). The anterior margin of them is straight and rounded at the corners, while the posterior margin is formed into a row of 5-8 teeth (s. fig. 13). A very distinct character of this species are the scales on the toes, which cover them only laterally on the outer side (s. fig. 12). I was able to demonstrate the presence of a hypostomium (s. fig. 14).