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Help needed in fossil sharks ID - part 2 (Upper Paleocene of Chile)


terminatordiego

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terminatordiego

Hello to all of you guys, a couple of weeks before i asked for help in relation with some shark teeth, and the help indeed was very nice!

A couple days before i was back in field trip and found some more teeth from the same strata, and would need your help for the correct ID (hopefully at species or genus level), you guys are awesome!!!

Here´s the list of the fossils (each step of the ruler is 2mm):

 

1) A tiny tooth with very small roots and 3 denticles, the central and main one is triangular and very oblicuous

1.thumb.jpg.167a02f8e2b984040cd1f19d601b10ec.jpg1-1.thumb.jpg.084e82ed6bbf600472bb97f0a7be4aca.jpg

 

2) A tooth with very triangular cusplets and with small and shorts ridges in the base of the main denticle (wich is slightly curved), the roots are slightly asymmetrical

IMG_20211105_000644.thumb.jpg.7f3ac6d19d080dcf3bec35aaac9e989b.jpg2.thumb.jpg.7e58d2cc6efc6c322b05b3b99f881a17.jpg

 

3) A half of tooth with triangular cusplets and with a slight triangular depression in the base of the main denticle (wich is slightly curved)

IMG_20211105_001728.thumb.jpg.9245e659fa0d1f8876d264a56f7a0c5f.jpg3.thumb.jpg.7bf3942c05c520aff43de30f4d304882.jpg

 

4) A (i think so) stingray tail fossill

IMG_20211105_004147.thumb.jpg.e9176f7cb931d26a94f51309dee6d135.jpg4.thumb.jpg.3124f193eb7df159ea77d0f03496612d.jpg

 

5) A tooth that i dont know what could be (the tip is very smooth and the roots have a wood-like texture)

IMG_20211105_011557.thumb.jpg.789c57865129bcf1f2501fc65692372b.jpg5.thumb.jpg.468f14946eb885174eacd7caf83b7611.jpg

 

6) A tooth that i think is from Premontreia subulidens, but im not 100% sure

IMG_20211105_142015.thumb.jpg.01b93bf7af38d9eff71c99953393dd72.jpg7.thumb.jpg.82ba11a81682158df2f3996abfa7b734.jpg

 

7) Something that i dont know what it is, looks like some kind of skin or membrane

IMG_20211105_150721.thumb.jpg.ca82fbd3787cdbbb0f5d4ea56791417f.jpg

 

8) A tooth similar in color and root texture that number 5, but with only 1 denticle

IMG_20211105_172845.thumb.jpg.9996dd0533204fcf71d71e461bfcf6f4.jpg9.thumb.jpg.cf9ec23fbe4792e73ffc066243b5080f.jpg

 

 

9) A tooth with very triangular cusplets and low developed roots

IMG_20211105_173001.thumb.jpg.32af185aab2686725a738f71893db293.jpg10.thumb.jpg.55f3aaae767cc163b3cee408e82c458d.jpg

 

10) A tooth with maybe similar look about Carcharias teretidens? but with slightly longer lateral denticles

IMG_20211105_193426.thumb.jpg.76a658e562c77c1ab18d4f0997313636.jpg11.thumb.jpg.027e5f8edcacfc9c14843405b7a86eb1.jpg

 

11) A tooth with aparently only one denticle, and asymmetrical roots (the rightest part of the right root is easly confused with the sandstone matrix)

IMG_20211105_212132.thumb.jpg.6d02867e5c2b1dad2a2002dbd58ccf95.jpg12.thumb.jpg.73987da5aa8942223ad4499aff132b9b.jpg

 

12) A tooth with two denticles, striae in the lingual face, triangular depression in the base of the main denticle and the base of the crown is much more prominent that the diameter of the main denticle, might be reworked because is from a level stratigraphically higher.

pre.thumb.jpg.22d962616b4ea2097fc73e804b034d83.jpg13-1.thumb.jpg.86d750532538fbe47f12fc83f58ef428.jpg13-2.thumb.jpg.d67f6493f084130f0cb6832a3f456f86.jpg13-3.thumb.jpg.0730ee1ca79a637d2c8063a8aa1e0c43.jpg

 

Finally, as a bonus track, here it is a vert. that i found in the same field trip:

66.thumb.jpg.9a69d4371d1f92ff38a38b3fd6e17746.jpg6-1.thumb.jpg.c7c4f2516ae11e61c19014bc381803d6.jpg6.thumb.jpg.7be4a8a9eab7791c1f4b855224bce2f3.jpg

 

Edited by terminatordiego
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#1 looks like an extreme posterior tooth -- maybe Cretalamna sp.?

 

#4 looks like a ray spine to me as well -- cool piece!

 

#8 looks like a (para-)symphyseal tooth, perhaps from a sand tiger.

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terminatordiego
7 minutes ago, bthemoose said:

#1 looks like an extreme posterior tooth -- maybe Cretalamna sp.?

 

#4 looks like a ray spine to me as well -- cool piece!

 

#8 looks like a (para-)symphyseal tooth, perhaps from a sand tiger.

thanks!!!!! and yes, the ray spine is very nice!!!

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terminatordiego
23 minutes ago, bthemoose said:

Have you found Otodus obliquus teeth at this Paleocene deposit?

 

No, i havent, aparently the nearest I´ve found is cretolamna sp. (the tiny thing above)

Edited by terminatordiego
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terminatordiego

I just realized that the #9 was a partially exposed symphyseal tooth, here the images of the tooth (sadly the lateral denticle was broken during matrix extraction) here the images:

 

10-2.thumb.jpg.20ea7350b8f737da6126a0483596341c.jpg10-3.thumb.jpg.0684f542b218f35e3efea1e7342ba388.jpg10-4.thumb.jpg.ee30bad2d3d447e28a79871c563760a9.jpg

 

Also would be very helpfull if any of you guys who helped me before (thanks a lot) with paleocene sharks, know something about these 12 fossils

@will stevenson and @MarcoSr

:)

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7 hours ago, terminatordiego said:

I just realized that the #9 was a partially exposed symphyseal tooth, here the images of the tooth (sadly the lateral denticle was broken during matrix extraction) here the images:

 

10-2.thumb.jpg.20ea7350b8f737da6126a0483596341c.jpg10-3.thumb.jpg.0684f542b218f35e3efea1e7342ba388.jpg10-4.thumb.jpg.ee30bad2d3d447e28a79871c563760a9.jpg

 

Also would be very helpfull if any of you guys who helped me before (thanks a lot) with paleocene sharks, know something about these 12 fossils

@will stevenson and @MarcoSr

:)

 

I agree that 8 looks like a sand tiger symphyseal tooth.  This tooth doesn't look like a symphyseal tooth to me.  From the root it looks like Scyliorhinidae, maybe Scyliorhinus sp.  Not knowing the fauna I really can't ID the other sand tiger teeth.  There are just too many Paleocene sand tiger species that look too similar.  4 is a stingray barb.  7 looks like it is from a fish.  Can't say more from the picture.  1 maybe Cretalamna sp.  Some species have double cusplets.

 

Marco Sr.

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terminatordiego
6 hours ago, MarcoSr said:

 

I agree that 8 looks like a sand tiger symphyseal tooth.  This tooth doesn't look like a symphyseal tooth to me.  From the root it looks like Scyliorhinidae, maybe Scyliorhinus sp.  Not knowing the fauna I really can't ID the other sand tiger teeth.  There are just too many Paleocene sand tiger species that look too similar.  4 is a stingray barb.  7 looks like it is from a fish.  Can't say more from the picture.  1 maybe Cretalamna sp.  Some species have double cusplets.

 

Marco Sr.

oh, I see it now

Thanks a lot Marco!!!

You guys are awesome!!!

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will stevenson

I’d say

1.striatolamia striata

2. Hypotodus sp.

3. Unsure

4.yes sting Ray barb 

5.carcharias

6.pachyscyllium?

7.?

8.symphaeseal

9.striatolamia striata

10. Carcharias

11.striatolamia striata

12. Striatolamia striata

its worth noting that some of these teeth don’t look like paleocene species

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terminatordiego
31 minutes ago, will stevenson said:

I’d say

1.striatolamia striata

2. Hypotodus sp.

3. Unsure

4.yes sting Ray barb 

5.carcharias

6.pachyscyllium?

7.?

8.symphaeseal

9.striatolamia striata

10. Carcharias

11.striatolamia striata

12. Striatolamia striata

its worth noting that some of these teeth don’t look like paleocene species

Thank you so much Will !!!

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will stevenson
22 minutes ago, terminatordiego said:

Thank you so much Will !!!

No problem ;) 

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