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Van Helden has studied beaked whales for 35 years, but Monday was the first time he has participated in a dissection of the spade-toothed variety. In fact, the careful study of the creature -- which washed up dead on a New Zealand beach in July — is the first ever to take place.

None has ever been seen alive at sea.

The list of what scientists don’t know about spade-toothed whales is longer than what they do know. They don’t know where in the ocean the whales live, why they’ve never been spotted in the wild, or what their brains look like. All beaked whales have different stomach systems and researchers don’t know how the spade-toothed kind processes its food. They don’t know how this one died.

Over the next week, researchers studying the 5-meter (16-foot) -long male at an agricultural research center near the city of Dunedin hope to find out.

“There may be parasites completely new to science that just live in this whale,� said van Helden, who thrilled at the chance of learning how the species produces sound and what it eats. “Who knows what we’ll discover?�

Only six other spade-toothed whales have ever been found, but all those discovered intact were buried before DNA testing could verify their identification.

New Zealand is a , with since 1840, according to the Department of Conservation. The first spade-toothed whale bones were found in 1872 on New Zealand’s Pitt Island. Another discovery was made at an offshore island in the 1950s, and the bones of a third were found on Chile’s Robinson Crusoe Island in 1986.

DNA sequencing in 2002 proved that all three specimens were of the same species — and that it was distinct from other beaked whales. But researchers studying the mammal couldn’t confirm whether the species was extinct until 2010, when two whole spade-toothed whales, both dead, washed up on a New Zealand beach. But none has been studied before.

On Monday, the seventh of its kind, surrounded by white-aproned scientists who were measuring and photographing, appeared relatively unblemished, giving no clue about its death. Researchers pointed out marks from cookiecutter sharks — normal, they said, and not the cause.

The dissection will be quiet, methodical and slower than usual, because it is being undertaken in partnership with M�ori, New Zealand's Indigenous people. To M�ori, whales are a taonga -– a precious treasure -– and the creature will be treated with the reverence afforded to an ancestor.

Members of the local iwi, or tribe, will be present throughout the dissection and consulted at each turn, allowing them to share traditional knowledge and observe customs, such as saying a karakia -– a prayer -– over the creature before the study begins.

“According to our beliefs and our traditions, this whale is a gift of Tangaroa, deity of the ocean,� said Tumai Cassidy from the local people Te Rūnanga Ōt�kou. “It’s very important for us to respect that gift and to honor the whale.�

The iwi will keep the jawbone and teeth of the whale at the end of the dissection, before its skeleton is displayed in a museum. 3D printing will be used to replicate those parts, using a CT scan taken of the whale’s head this week.

“It all builds a richer picture for that species but also tells us how it interacts with our oceans,� Cassidy said.

It’s thought that spade-toothed whales live in the vast Southern Pacific Ocean, home to some of the world’s deepest ocean trenches. Beaked whales are the ocean's deepest divers for food, and the spade-toothed may rarely surface, adding to its mystery.

The assembled scientists on Monday included a few who had traveled from abroad to see the whale, which was put in refrigerated storage after its discovery.

“What we are interested in is not only how these animals died, but how they lived,� said Joy Reidenberg, a comparative anatomist from the Icahn School of Medicine at Mount Sinai in New York. “In discovering how they live, we are hoping to find discoveries that we can apply back to the human condition.�