Information:  - The Russell 3000 Index is a capitalization-weighted stock market index, maintained by FTSE Russell, that seeks to be a benchmark of the entire U.S stock market. It measures the performance of the 3,000 largest publicly held companies incorporated in America and is based on market capitalization. It represents approximately 98% of the American public equity market. The stocks of the Russell 3000 Index have a weighted average market capitalization of about $126 billion; the median market capitalization is approximately $1.6 billion. The index was launched on January 1, 1984.  - A stock index or stock market index is a measurement of the value of a section of the stock market. It is computed from the prices of selected stocks (typically a weighted average). It is a tool used by investors and financial managers to describe the market, and to compare the return on specific investments.  - The Russell Small Cap Completeness Index measures the performance of the companies in the Russell 3000 Index excluding the companies in the S&P 500 . It provides a performance standard for active money managers seeking a liquid extended benchmark , and can be used for a passive investment strategy in the extended market . Weighted average market capitalization is approximately $ 5.7 billion ; median market capitalization , $ 711.5 million . The index 's largest company has a market capitalization of approximately $ 83.7 billion ; the smallest , $ 182.6 million .    What is the relationship between 'russell small cap completeness index' and 'stock market index'?
Ans: instance of

Information:  - The Pyrgotidae are an unusual family of flies ( Diptera ) , one of only two families of Cyclorrhapha that lack ocelli . Most species are `` picture - winged '' ( i.e , have patterns of bands or spots on the wings ) , as is typical among the Tephritoidea , but unlike other tephritoids , they are endoparasitoids ; the females pursue scarab beetles in flight , laying an egg on the beetle 's back under the elytra where the beetle can not reach it . The egg hatches and the fly larva enters the body cavity of the beetle , feeding and eventually killing the host before pupating . In the United States , some species of Pyrgota and Sphecomyiella can be quite common in areas where their host beetles ( typically the genus Phyllophaga , or `` June beetles '' ) are abundant . Like their host beetles , these flies are primarily nocturnal , and are often attracted to artificial lights .  - The Brachyceran infraorder Muscomorpha is a large and diverse group of flies, containing the bulk of the Brachycera, and, most of the known flies. It includes a number of the most familiar flies, such as the housefly, the fruit fly, and the blow fly. The antennae are short, usually three-segmented, with a dorsal arista. Their bodies are often highly setose, and the pattern of setae is often taxonomically important.  - Cyclorrhapha is an unranked taxon within the infraorder Muscomorpha. They are called "Cyclorrhapha" ('circular-seamed flies') with reference to the circular aperture through which the adult escapes the puparium. This is a circumscriptional name that has significant historical familiarity, but in the present classification, this name is synonymous with the more recent "Muscomorpha"; details and reasoning are presented .    What is the relationship between 'pyrgotidae' and 'muscomorpha'?
Ans: parent taxon