Mongolicosa songi is a species of wolf spider

Wolf spider

Wolf spiders are members of the family Lycosidae, from the Ancient Greek word "" meaning "wolf". They are robust and agile hunters with good eyesight. They live mostly solitary lives and hunt alone. Some are opportunistic hunters pouncing upon prey as they find it or even chasing it over short...

 found in Xinjiang

Xinjiang

Xinjiang is an autonomous region of the People's Republic of China. It is the largest Chinese administrative division and spans over 1.6 million km2...

, China

People's Republic of China

China , officially the People's Republic of China , is the most populous country in the world, with over 1.3 billion citizens. Located in East Asia, the country covers approximately 9.6 million square kilometres...

 and adjacent areas of Mongolia

Mongolia

Mongolia is a landlocked country in East and Central Asia. It is bordered by Russia to the north and China to the south, east and west. Although Mongolia does not share a border with Kazakhstan, its western-most point is only from Kazakhstan's eastern tip. Ulan Bator, the capital and largest...

.

This is a dirty-brown coloured spider up to 7.4 mm in length with few distinguishing markings apart from a faint heart-shaped mark on the abdomen. It's closest known relative is M. gobiensis

Mongolicosa gobiensis

Mongolicosa gobiensis is a species of wolf spider only known from a single female collected in Khürmen district, Ömnögovi Province, Mongolia....

, from which it can be distinguished only by details of the genitalia.