Observation of larvae PP

An unknown organism was given for observation. The body of the creature is approximately 14mm in length and 3mm in width; it also has a flexible thin tail around 17mm long. The specimen is worm like in movement, extending and contracting its body to propel forward. It is a translucent yellow or tan color so some of the interior is visible through the first layer. Underneath this layer, it can be seen that at both ends of the body it appears to be black, while the middle body is white. At the back the darker portion extends through the tail and is exposed at the tip. The specimen is very active. At first, the organism moved along the edges of the dish it was contained in, occasionally stopping at the edge, but as time went on it tried to scale the sides of the dish more often. It would be useful to know what environment the specimen lives in and what it consumes.