Show me your six and seven gill shark teeth

[siteseer]

That is a rare tooth from there.  That's a tough species to find from anywhere.

[siteseer]

Here's a Hexanchus andersoni tooth I dug up while collecting with my friend, Bob Ernst, in the early 2000's.  One of the best lower anterolaterals I've ever found.  It measures 1 1/4 inches (31mm) across.

[siteseer]

Here's a Hexanchus andersoni lower symphyseal tooth also from the Sharktooth Hill Bonebed, Bakersfield, CA.  It's just under 5/8 of an inch wide (15mm).

[hokietech96]

3 hours ago, siteseer said:

Here's a Hexanchus andersoni lower symphyseal tooth also from the Sharktooth Hill Bonebed, Bakersfield, CA.  It's just under 5/8 of an inch wide (15mm).

your teeth are always amazing!  I have an amazing collection!

[hokietech96]

You have an amazing collection! haha.  (i wish it was my collection apparently)

[siteseer]

On 10/1/2021 at 8:09 PM, hokietech96 said:

You have an amazing collection! haha.  (i wish it was my collection apparently)

 

Thanks.  it took only thirty years to put it together.

[sixgill pete]

From the Eocene Castle Hayne Formation of North Carolina. Comfort Member. These came from a private site in Jones County. Hexanchus agassizi. These teeth are extremely rare in the N.C. Eocene. Also remember these teeth are quite small compares to most Hexanchids. The upper is 8.3 mm wide by 9.5 mm tall and the first lower is 17.2 mm wide and 6.0 mm tall and the second 15.2 mm wide by 7.6 mm tall.

 

First a nice upper tooth.

 

  

 

A couple lowers

 

  

 

  

 

I also have an upper symphyseal I need to take pics of. So far though the sought after lower symphyseal has eluded me.

 

 

[Coco]

Marvelous !

 

Coco

[Woopaul5]

Been a long while since I’ve visited. Glad to see people are still adding to this thread!!! 
 

Here’s some Hexanchus agassizi from Sheppy, UK
 

thanks

 

Paul

[siteseer]

Great teeth, Paul.  The London Clay has yielded some of the smallest Hexanchus teeth I've ever seen. 

 

That one on the lower right has the lightest-colored root I've seen from there.

Edited December 17, 2021 by siteseer
additional thought

[Woopaul5]

On 12/17/2021 at 11:23 AM, siteseer said:

Great teeth, Paul.  The London Clay has yielded some of the smallest Hexanchus teeth I've ever seen. 

 

That one on the lower right has the lightest-colored root I've seen from there.

Thanks Jess!  Looks almost like the ones from Harleyville. Quite odd in my opinion 

Edited December 20, 2021 by Woopaul5

[siteseer]

13 hours ago, Woopaul5 said:

Thanks Jess!  Looks almost like the ones from Harleyville. Quite odd in my opinion 

 

The only other thing you should add is the width of the largest and smallest teeth in that set so that newbies know the general size range of that species.

 

Happy Holidays,

 

Jess

[siteseer]

Here's another Hexanchus lower anterolateral from the Sharktooth Hill Bonebed, Bakersfield, California.  It's about13/16 inches (28mm) wide 

[siteseer]

Here's a posterior tooth (before they get tiny) of Hexanchus from the early Pliocene San Mateo Formation, Oceanside, San Diego County, CA.  It measures 1 9/16 inches (14mm).

[Untitled]

Welcommia bodeuri 
Early Cretaceous (Valanginian)
St Hippolyte du fort, France

 

The genus Welcommia has a Hexanchoid crown structure, but a  pseudopolyaulacorhize root vascularization structure similar to those of Paraorthacodus and Synechodontiformes.  Histologically, this enigmatic genus is most similar to Hexanchiformes, and also similar to Paraorthacodus and Sphenodus (more similar to these two genera that are commonly classified under Synechodontiformes, than these two genera are similar to other Synechodontiformes, themselves), but not similar to Synechodus.  This provides evidence that Paraorthacodus and Sphenodus may in fact be basal Hexanchiformes, and that Hexanchiformes may have derived from a similar shark to Paraorthacodus (still in debate amongst paleontologists).

[sixgill pete]

 

Hexanchus agassizi from the Eocene Castle Hayne Formation in eastern North Carolina. Very rare to find. Here are 4 complete lowers, 2 complete uppers and an upper symphyseal.

 

The largest one, bottom left is 19.2 mm wide (0.75 inch) 

Edited January 3, 2022 by sixgill pete

[fossilcole]

This Notorynchus Kempi symphyseal tooth was found washed out of the East end of Bracklesham Beds on the South coast of England some years ago. I have collected from this site for over 40 years and have only found a handful of Hexanchids This one is a beauty. (14mm)

http://www.dmap.co.uk/fossils/bracklesham/vert/notkem2.jpg

[fossilcole]

[digit]

5 hours ago, fossilcole said:

Now there's a pretty little thing!

 

Any information on this beauty?

 

 

Cheers.

 

-Ken

[fossilcole]

Yes, I found this some years ago now and is a Notorynchus Kempi symphyseal tooth washed out of the Bracklesham Beds (Mid eocene), South Coast England. A rare find. 

[fossilsonwheels]

On 1/3/2022 at 7:56 AM, Untitled said:

Welcommia bodeuri 
Early Cretaceous (Valanginian)
St Hippolyte du fort, France

 

The genus Welcommia has a Hexanchoid crown structure, but a  pseudopolyaulacorhize root vascularization structure similar to those of Paraorthacodus and Synechodontiformes.  Histologically, this enigmatic genus is most similar to Hexanchiformes, and also similar to Paraorthacodus and Sphenodus (more similar to these two genera that are commonly classified under Synechodontiformes, than these two genera are similar to other Synechodontiformes, themselves), but not similar to Synechodus.  This provides evidence that Paraorthacodus and Sphenodus may in fact be basal Hexanchiformes, and that Hexanchiformes may have derived from a similar shark to Paraorthacodus (still in debate amongst paleontologists).

Fantastic tooth Ben. I had absolutely no luck trying to find one. Thanks for sharing a rarity 

[Untitled]

On 1/8/2022 at 9:39 PM, fossilsonwheels said:

Fantastic tooth Ben. I had absolutely no luck trying to find one. Thanks for sharing a rarity 

Thank you, this has proven to be a very, very difficult genus to acquire; one that not many people have seen outside of publications.

[fossilsonwheels]

It’s been awhile since I added to the thread. Both of these are from STH. The larger one is our only Hexanchus symphyseal tooth. I was very happy to finally knock this off our list. 

 

The dot to the right is a commisural tooth ! Apparently quite  rare. I wasn’t convinced it was one until I looked at extant teeth on line. They are quite unique. Maybe the coolest thing we’ve found in STH micro searches. I’ll get some pictures under the micro eye soon. 

[digit]

Quite a score!

 

See this other post including a Hexanchus dentition showing the symphyseal and the commissural teeth.

 

 

Cheers.

 

-Ken

[Woopaul5]

Notidanodon loozi

Khouribga, Morocco 

 

Been fortunate in finding a direct source that’s willing to part with them from Morocco. The upper picture are ones I have that are 2” or bigger with the largest being 2.19”. Some have been glued back and some have been stabilized. Eventually I’d like to make a dentition but the symphyseal eludes me (if it even exists) along with some uppers 

Edited February 6, 2022 by Woopaul5