Females of this species typically measure between 1.1 to 1.3 mm in length, while males are comparatively smaller, with a body length ranging from 0.8 to 1.0 mm. One of the notable characteristics of this organism is its unusually wide head at the front. Additionally, the body displays vibrant colors, predominantly yellow to orange, although occasional individuals may exhibit a red hue. The diet of O. venusta consists of a diverse range of food sources, including various zooplankton and phytoplankton, highlighting its role in aquatic ecosystems.