Peace River Cetacean Ear Bones

[Meganeura]

In trying to find an ID for an ear bone I found yesterday, I stumbled upon a thread here discussing different sizing of dolphin ear bones in Florida - and wanted to ask if anyone ( @Boesse) might know or be able to ID these!

 

1) So this first one is my biggest at 44.5mm long:

 

 

2) This next one is 32mm long:

 

Comparison of the 2:

 

 

3 + 4) Then I’ve got these 2 that are the same size, 25mm:

 

All 4 together:

 

 

And also I know the bottom of these 2 is whale - but is the top also whale?

 

Thanks in advance!

[Meganeura]

Update - the last one I have that I posted next to the whale ear bone is confirmed to be a tympanic bulla - most likely from a Pomatodelphis sp. 

The smaller 3 periotics are also most likely Pomatodelphis sp - or at least I believe them to be.

[Nimravis]

Nice finds Daniel, but I can’t HEAR you, what are you asking? Lol

[Meganeura]

5 minutes ago, Nimravis said:

Nice finds Daniel, but I can’t HEAR you, what are you asking? Lol

Well these guys certainly won't be hearing much given they all seem to be missing ears!

[Boesse]

Here are my thoughts on the periotics:

 

1 & 2 - Platanistidae, probably juvenile Pomatodelphis.

 

3 - Eurhinodelphinidae.

 

4 - Physeteroidea indet. (sperm whale).

Edited August 7, 2022 by Boesse

[Meganeura]

10 minutes ago, Boesse said:

Here are my thoughts on the periotics:

 

1 & 2 - Platanistidae, probably juvenile Pomatodelphis.

 

3 - Eurhinodelphinidae.

 

4 - Physeteroidea indet. (sperm whale).

Thank you so much! And wow, didn't realize that I had a sperm whale periotic, that's awesome. Thanks Bobby!