色花堂app

If you step in a time warp and end up on beach back there somewhere between Chicago and Colorado, don鈥檛 be worried about great white sharks because great whites don鈥檛 exist, yet. But  perhaps a better 鈥淛aws鈥� movie could have been made then, featuring a scissor-tooth shark, that just had a single row of teeth in the midline of its top and bottom jaws that were used like a pair of scissors to capture prey.

鈥淭he jaws sliced toward each other like scissors, but there is this backwards, dragging motion, so they could chop and slice,鈥� said Leif Tapanila, an 色花堂app geosciences professor and director of the Idaho Museum of Natural History, where there are models and fossils of the scissor-toothed shark, scientific name Edestus, on display.

Tapanila, working with Jesse Pruitt, the manager of the museum鈥檚 Idaho Virtualization Laboratory, are able to travel back in time, to some extent, by analyzing fossil bones and teeth and using 3D-imaging to reconstruct animals that lived in previous geologic time periods.

Tapanila and Pruitt teamed up to produce a study 鈥淩edefining species concepts for the Pennsylvanian scissor tooth shark, Edestus鈥�&苍产蝉辫;recently published in the journal PLOS ONE that documents previously unknown facts about this shark. The scissor-tooth shark preceded by 10 million years another famous shark in the Idaho Museum of Natural History鈥檚 collections and exhibits, the buzzsaw shark, the Helicoprion.

This was the pair鈥檚 second paper to be published about the scissor-tooth shark.

鈥淲ith this paper, we built on the last one,鈥� Tapanila said. 鈥淭he first paper we had the skull of the animal and we described the skull for the first time, so with this paper we could put the jaw in context to the way the rest of it functioned.鈥�

Previously in scientific literature there were about 14 species of the scissor-tooth shark described from Great Britain to the United States and Russia.

鈥淲hat this study has done is look at darn near every tooth we could find of this fossil and we asked the question, 鈥榟ow many kinds are there?鈥欌�� Tapanila said. 鈥淎nd because we now have a skull of one of this species, we can make some guesses about how large this animal could get and really try to understand this group because it is part of this bigger group of sharks that are just bizarre, but they dominated the marine world and today they are gone.鈥�

The researchers were able to determine there are only four distinct species of this shark, based on the shape of their teeth and other factors. They were also able to estimate how large they could get, 鈥渙ver 15 feet, in the 16-foot range,鈥� Tapanila said.

鈥淲e had all these specimens and were able to measure  everything we could and be able to quantify  those differences between species,鈥� Tapanila said.

After they were able to narrow the number of this shark species down to four, the scientists were able to learn other new things.

鈥淲e can now figure out the expansion of this group,鈥� Tapanila said. 鈥淚t looks like  they first appear in Great Britain (covered in water) and, as the sea level was rising back then, the group expands out into Russia and the United States, so they are the dominate predatory sharks in that time period between Chicago and all the way down to Colorado.鈥�

He said it has taken scientists a long time to figure out some of the mysteries of this species.

鈥淲hat is really fascinating is that for about 150 years we鈥檝e known these (scissor-toothed shark) teeth exist, but there is so little information about these sharks because they don鈥檛 preserve well,鈥� Tapanila said. 鈥淚t has taken a lot of time to pull together enough information that we can get a fuller glimpse of the diversity of what these animals were like and maybe start asking questions, 鈥榃hy were they so successful?鈥� 鈥榃hy did they disappear?鈥欌��

He said some of the ideas they are developing key on their major prey item, squid, that scissor-toothed sharks were very well equipped to eat. But during this time period, squid and squid relatives were diversifying at this time as well.

鈥淪o maybe what was really controlling the predators during that time really has to do with the prey that are becoming more abundant,鈥� he said.

This newly published research demonstrates how ISU geosciences, Idaho Museum of Natural History and the Idaho Virtualization Laboratory are teaming up to do research and create exhibits.

鈥淭his is another collaboration with Jesse Pruitt, who is the coauthor on it,鈥� Tapanila said. 鈥淭he Idaho Virtualization Lab is a big part of what we are able to do. This project started about five years ago and it started with us scanning some of the original fossils over in Philadelphia, at the Academy of Natural Sciences Museum.鈥�

The ISU researchers also studied collections at the Field Museum in Chicago.

鈥淭hose collections are just a gold mine, amazing stuff,鈥� Tapanila said.

The same could be said for some of the displays at the Idaho Museum of Natural History where a model of a full-sized of Edestus is on display as part of the museum鈥檚 鈥淭he Buzzsaw Sharks of Idaho Wicked and Weird exhibit.鈥�