Mammoth construction of the Great Pyramid of ancient Egypt. The earliest known proboscideans, the clade that contains the elephants, existed about 55 million years ago around the Tethys Sea area. The closest relatives of the Proboscidea are the sirenians and the hyraxes. The family Elephantidae is known to have existed six million years ago in Africa, and includes the living elephants and the mammoths. Among many now extinct clades, the mastodon is only a distant relative of the mammoths, and part of the separate Mammutidae family, which diverged 25 million years before the mammoths evolved. The following cladogram shows the placement
Relative clause on the forms of Latin relative pronouns, "see" the section on relative pronouns in the article on Latin declension. Ancient Greek follows the same rule as Latin. The Ancient Greek relative pronoun ὅς, ἥ, ὅ ("hós, hḗ, hó") is unrelated to the Latin word, since it derives from Proto-Indo-European : in Proto-Greek, "y" before a vowel usually changed to "h" (debuccalization). Cognates include Sanskrit "yas, yā, yad" (where "o" changed to short "a"). The Greek definite article ὁ, ἡ, τό ("ho, hē, tó") has a different origin, since it is related to Sanskrit "sa, sā" and Latin "is-tud". Information that