Filipinos are an Austronesian people, a linguistic and genetic group that includes other ethnicities from maritime Southeast Asia, Madagascar, and the Pacific islands. Haplogroup O1a-M119 (labeled as "Haplogroup H"), is commonly found among Filipinos and is shared with other Austronesian-speaking populations. After the 16th century, the colonial period saw the influx of limited genetic influence from Europeans and other populations from the Americas, Oceania, and Asia. Today, genetic markers of Europeans is found in about 4% of the population.Filipinos also exhibit Sundadonty (see below) This is regarded as having a more generalised morphology and having a longer ancestry than its offspring, Sinodonty (I.e. "Asian teeth"). Dental morphology provides clues to prehistoric migration patterns, with Sinodont dental patterns occurring in East Asia, Central Asia, North Asia, and the Americas. Sundadont patterns occur in mainland and maritime Southeast Asia as well as Oceania. Filipinos are also one of the Austronesian ancestors of modern Oceanic populations, including the Maori people of New Zealand. The current predominant theory of Austronesian migrations holds that Austronesians are believed to have reached Oceania through successive southward and eastward migrations ultimately from Taiwan. . Sinodonty is a particular pattern of teeth common among Native Americans and some peoples in Asia, in particular the northern Han Chinese and some Japanese populations. The upper first two incisors are not aligned with the other teeth, but are rotated a few degrees inward and are shovel-shaped. The upper first premolar has one root (whereas the upper first premolar in Caucasians normally has two roots), and the lower first molar in Sinodonts has three roots (whereas it has two roots in Caucasians).