Magicman Posted November 10, 2014 Share Posted November 10, 2014 The closest I could match this fossil to is perleidus Madagascariensis. I could use some help from someone more exerienced with these type of fossils. It's origin is Tulear, Madagascar and it's in mud shale. Thanks Bob Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 10, 2014 Share Posted November 10, 2014 (edited) I am a mere hobbyist, but to me, I think it is probably Perleidus madagascariensis. The fact that there are no fins (other than the caudal visible), and the skull is unusually preserved either by strange angle or by unusual diagenesis, makes this specimen a bit difficult to identify. I would go with your original ID of Perleidus madagascariensis, based mostly on the shape of the scales, the depth of the body, and the shape of the caudal fin.. The other possible candidates include Parasemionotus labordei and Watsonulus eugnathoides. Maybe a few others - have a look at this thread for some more details. Also a google search may produce more info for you. Regards, Edited November 10, 2014 by Fossildude19 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
caterpillar Posted November 10, 2014 Share Posted November 10, 2014 I think it's Australosomus merlei http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
Auspex Posted November 10, 2014 Share Posted November 10, 2014 Images: LINK "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 10, 2014 Share Posted November 10, 2014 (edited) I think it's Australosomus merlei Australosomus's scales are much too big, and rectangular, in my opinion. The body on this example is much deeper than you would expect from Australosomus, as well. I would consider Parasemionotus as an alternative, but without fins, or well preserved skull, it's kind of hard to tell for sure. Maybe Thomas (Oilshale) will weigh in. Regards, Edited November 11, 2014 by Fossildude19 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Magicman Posted November 10, 2014 Author Share Posted November 10, 2014 Thanks for the replies. I've done a lot of googling and I'm still not sure. I do have one more pic - hope it helps. Bob Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 11, 2014 Share Posted November 11, 2014 (edited) This post in an earlier thread is quite similar to your specimen. Right down to the head preservation/skull ornamentation. I think it was mislabeled as Pterinosculus sp.( I am having a hard time finding this as a fish genus) , and should have been labeled not Boresomus, but Perleidus madagascariensis or Parasemionotus labordei. Here are a few photos to show my reasoning: Pic from post mentioned, next to yours. Pretty good match, I'd say. Next compared to Australosomus: Next, compared to Parasemionotus: and finally, to Perleidus: What do you think? I have pm'd Thomas - hope he chimes in here. But I would lean towards Parasemionotus, or Perleidus. Regards, EDIT: the name was misspelled in the post and shouldn't be Pterinosculus, but Pteronisculus! It could be Pteronisculus sp. as well. ! See the one listed HERE. Edited November 11, 2014 by Fossildude19 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Magicman Posted November 11, 2014 Author Share Posted November 11, 2014 Thanks Tim, That's a great comparison. I tend to agree with you. I hope Thomas does take a look. He certainly knows his fish fossils. Smiles Bob Link to comment Share on other sites More sharing options...
izak_ Posted December 21, 2014 Share Posted December 21, 2014 I think it's Australosomus merlei Yeah, Agreed Link to comment Share on other sites More sharing options...
Fossildude19 Posted December 22, 2014 Share Posted December 22, 2014 (edited) Yeah, Agreed Ummm, ... Did you actually even look at the comparisons?? It really does not look like Australomus, due to the scales being much wider, shorter, and less rectangular than in Australomus. Regards. Edited December 22, 2014 by Fossildude19 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Shortmegan Posted December 23, 2014 Share Posted December 23, 2014 I'm not sure what it is, but I've seen similar specimens around Madagascar. Yours is really a nice looking one! Link to comment Share on other sites More sharing options...
AussieFossilHunter Posted January 21, 2017 Share Posted January 21, 2017 Hi guys, The fish in this photo on the right is my specimen and its Boreosomus. Pi have both sides to tO this specimen and the dorsal fin is well in front of the pelvic fins. This fin arrangement coupled with square scales and reasonably strong Heterocercal tail make this species a dead giveaway. your specimen here is preserved a bit messy, I can't I'd the fins properly but the scales and tail are signs of Boreosomus. Also Boreosomus tends to be preserved in ventro/dorsal positions a lot, maybe this fish was quite a fat fish compared to its overall height. 1 Link to comment Share on other sites More sharing options...
JohnJ Posted January 21, 2017 Share Posted January 21, 2017 4 minutes ago, AussieFossilHunter said: Hi guys, The fish in this photo on the right is my specimen and its Boreosomus. Pi have both sides to tO this specimen and the dorsal fin is well in front of the pelvic fins. This fin arrangement coupled with square scales and reasonably strong Heterocercal tail make this species a dead giveaway. your specimen here is preserved a bit messy, I can't I'd the fins properly but the scales and tail are signs of Boreosomus. Also Boreosomus tends to be preserved in ventro/dorsal positions a lot, maybe this fish was quite a fat fish compared to its overall height. @AussieFossilHunter Helping to solve a 2+ year old ID is awesome...but you'll need bigger images to illustrate your point. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
AussieFossilHunter Posted January 21, 2017 Share Posted January 21, 2017 John, I'm just packing to go on a trip, will have to wait till I'm back next weekend as specimen is packed away. I have another Boreosomus in fusiform postion that I can also maybe mark-up in red to illustrate. Been away from forum a while! Link to comment Share on other sites More sharing options...
Fossildude19 Posted January 21, 2017 Share Posted January 21, 2017 9 hours ago, JohnJ said: @AussieFossilHunter Helping to solve a 2+ year old ID is awesome...but you'll need bigger images to illustrate your point. 3 hours ago, AussieFossilHunter said: John, I'm just packing to go on a trip, will have to wait till I'm back next weekend as specimen is packed away. I have another Boreosomus in fusiform postion that I can also maybe mark-up in red to illustrate. Been away from forum a while! I've replaced the picture AussieFossilHunter posted with the one from my post (the 5th) - which is his fish on the right. Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
AussieFossilHunter Posted February 1, 2017 Share Posted February 1, 2017 Ok, have three Boreosomus specimens to show with fin arrangement marked up. First one is the original in this post and we will call it specimen A. Link to comment Share on other sites More sharing options...
AussieFossilHunter Posted February 1, 2017 Share Posted February 1, 2017 Second specimen preserved lateral, crushed quite vertical with bottom jaw displaced. Has a nice dorsal fin on both sides. Link to comment Share on other sites More sharing options...
AussieFossilHunter Posted February 1, 2017 Share Posted February 1, 2017 Ok Third and final specimen. This one in natural fusiform form. Only shows dorsal fin on one side as like specimen A is slightly rolled. Also shows the typical palaeoniscoid eye at front of skull! Hope this helps with identifying Boreosomus for others. Steve 1 Link to comment Share on other sites More sharing options...
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