希少な病理学的特徴をもつ、Onchopristis numidus の双鋭吻部棘歯 ― 白亜紀のノコギリザメ - 化石歯
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Description from the seller
Scientific name: Onshopristis numidus - サワーフィッシュの口吻歯 - 本物の異常または病的な二重刺毛 denticle を伴う。
Location: Taouz, South Morocco
Geological Formation: Ifezouane Fm - KemKem Red Sandstone Beds
Age: Upper Cretaceous, Cenomanian stage ( 96 million years)
Size: 9cm
REF.: #J658
DESCRIPTION:
Observations: The so-called “teeth” of Onchopristis numidus are actually modified rostral denticles that were arranged laterally along its saw-like rostrum. Although these elements are relatively common in Cretaceous deposits of North Africa, particularly in the Kem Kem Beds of Morocco, specimens displaying an abnormal morphology with two distinct points or barbs are considerably rarer.
The significance of this anomaly has been scientifically documented. A specific study of aberrant O. numidus denticles described a specimen possessing at least two barbs along the posterior margin and concluded that it did not necessarily represent a different species, but rather an aberrant or pathological morphology of Onchopristis numidus.
The authors also noted that normal remains of this species are abundant in the Kem Kem deposits, whereas these pathological morphologies occur only occasionally.
Subsequent research provides further evidence regarding their rarity and authenticity. Multi-barbed denticles have been examined using sectioning and micro-CT techniques. In one case, the specimen was found to have been manipulated by joining parts from different individuals, whereas another genuine double-barbed denticle was sectioned and showed no evidence of artificial modification. This confirms that the anomaly genuinely occurred in O. numidus, while also highlighting the importance of carefully authenticating exceptional specimens offered to collectors.
About our specimen: It has some glued fractures, but after deep inspection, we concluded that this rostral tooth its very special and genuine, having double-barbed denticle showing no evidence of artificial modification.
All of our fossils come with a Certificate of Authenticity. Every week, the issued Certificates of Authenticity are updated in our database verification system on our website. If you find that your certificate has not yet been updated, please contact us and we will update it immediately. Display box not included.
Seller's Story
Jurassic Dreams is the world's largest online dinosaur fossils store, unrivaled as the most reputable source for authentic fossil specimens. We are the only leading online fossils store owned by an accredited geologist and paleontology expert. In addition, we have extraordinary authentic meteorites specimens from all over the universe.
With dozens of different specimens in stock... our customers come back time and again. Because, simply put, our lifetime guarantee is unbeatable.
My name is Juan A. Poblador and I have a strong academic background in Paleontology and Geology from the University of Madrid and University of Alicante. I have participated in fossil excavation projects in several locations mainly in Europe and Africa for over 10 years. Writing scientifically accurate descriptions of every specimen is one of the tasks that consume most of my time. Obviously, recognizing fake and restored fossils is second nature to me. So you can be sure that every fossil in this website has been carefully screened and inspected by me.
I have served collectors and fossil enthusiasts over the years. I have also supplied museums and institutions. I combine the study and research of significant specimens with exhibiting and selling the many other finds, which helps fund the new expeditions.
Additionally, I have a small team of support staff for logistics. I've personally trained them to handle and pack the fossils properly so that they can be shipped within 24 hours and arrive at your door in one piece.
Last but not least, I'm fortunate to have a great network of other seasoned paleontologists with whom I discuss the rarest items, new discoveries, and exploration trips to remote quarries... If I don't know something, the paleontological community really helps out.
I like to manage Jurassic Dreams as a well curated online exhibition of museum grade pieces. I'm a collector myself and I love to share the knowledge with other fellow collectors. That's why I will respond to any email when you have any doubt or when you buy, and you'll have a personalized fossil selection experience.
Jurassic Dreams a proud member of the Association of Applied Paleontological Sciences (AAPS) and abide by its Code of Ethics. The Association of Applied Paleontological Sciences conforms to the recommendations of The National Academy of Sciences Report on Paleontological Collecting and standard business practices and ethics.
In addition, we are the certified member #5681 of the International Meteorite Collectors Association (IMCA) and a certified member of GMA (Global Meteorite Association) G0043. IMCA and GMA are the most prestigious associations helping meteorite collectors in their search for Authentic Meteorites for their collections and assisting others in helping to learn more about meteorites.
A physical certificate of authenticity is provided free of charge with every fossil we sell. This is our lifetime guarantee. The certificate, individually prepared for each fossil by Juan A. Poblador, an expert paleontologist, contains an accurate scientific description, and the certificate's validity can be verified online at all times. In addition, a 100% money-back guarantee is provided.
Scientific name: Onshopristis numidus - サワーフィッシュの口吻歯 - 本物の異常または病的な二重刺毛 denticle を伴う。
Location: Taouz, South Morocco
Geological Formation: Ifezouane Fm - KemKem Red Sandstone Beds
Age: Upper Cretaceous, Cenomanian stage ( 96 million years)
Size: 9cm
REF.: #J658
DESCRIPTION:
Observations: The so-called “teeth” of Onchopristis numidus are actually modified rostral denticles that were arranged laterally along its saw-like rostrum. Although these elements are relatively common in Cretaceous deposits of North Africa, particularly in the Kem Kem Beds of Morocco, specimens displaying an abnormal morphology with two distinct points or barbs are considerably rarer.
The significance of this anomaly has been scientifically documented. A specific study of aberrant O. numidus denticles described a specimen possessing at least two barbs along the posterior margin and concluded that it did not necessarily represent a different species, but rather an aberrant or pathological morphology of Onchopristis numidus.
The authors also noted that normal remains of this species are abundant in the Kem Kem deposits, whereas these pathological morphologies occur only occasionally.
Subsequent research provides further evidence regarding their rarity and authenticity. Multi-barbed denticles have been examined using sectioning and micro-CT techniques. In one case, the specimen was found to have been manipulated by joining parts from different individuals, whereas another genuine double-barbed denticle was sectioned and showed no evidence of artificial modification. This confirms that the anomaly genuinely occurred in O. numidus, while also highlighting the importance of carefully authenticating exceptional specimens offered to collectors.
About our specimen: It has some glued fractures, but after deep inspection, we concluded that this rostral tooth its very special and genuine, having double-barbed denticle showing no evidence of artificial modification.
All of our fossils come with a Certificate of Authenticity. Every week, the issued Certificates of Authenticity are updated in our database verification system on our website. If you find that your certificate has not yet been updated, please contact us and we will update it immediately. Display box not included.
Seller's Story
Jurassic Dreams is the world's largest online dinosaur fossils store, unrivaled as the most reputable source for authentic fossil specimens. We are the only leading online fossils store owned by an accredited geologist and paleontology expert. In addition, we have extraordinary authentic meteorites specimens from all over the universe.
With dozens of different specimens in stock... our customers come back time and again. Because, simply put, our lifetime guarantee is unbeatable.
My name is Juan A. Poblador and I have a strong academic background in Paleontology and Geology from the University of Madrid and University of Alicante. I have participated in fossil excavation projects in several locations mainly in Europe and Africa for over 10 years. Writing scientifically accurate descriptions of every specimen is one of the tasks that consume most of my time. Obviously, recognizing fake and restored fossils is second nature to me. So you can be sure that every fossil in this website has been carefully screened and inspected by me.
I have served collectors and fossil enthusiasts over the years. I have also supplied museums and institutions. I combine the study and research of significant specimens with exhibiting and selling the many other finds, which helps fund the new expeditions.
Additionally, I have a small team of support staff for logistics. I've personally trained them to handle and pack the fossils properly so that they can be shipped within 24 hours and arrive at your door in one piece.
Last but not least, I'm fortunate to have a great network of other seasoned paleontologists with whom I discuss the rarest items, new discoveries, and exploration trips to remote quarries... If I don't know something, the paleontological community really helps out.
I like to manage Jurassic Dreams as a well curated online exhibition of museum grade pieces. I'm a collector myself and I love to share the knowledge with other fellow collectors. That's why I will respond to any email when you have any doubt or when you buy, and you'll have a personalized fossil selection experience.
Jurassic Dreams a proud member of the Association of Applied Paleontological Sciences (AAPS) and abide by its Code of Ethics. The Association of Applied Paleontological Sciences conforms to the recommendations of The National Academy of Sciences Report on Paleontological Collecting and standard business practices and ethics.
In addition, we are the certified member #5681 of the International Meteorite Collectors Association (IMCA) and a certified member of GMA (Global Meteorite Association) G0043. IMCA and GMA are the most prestigious associations helping meteorite collectors in their search for Authentic Meteorites for their collections and assisting others in helping to learn more about meteorites.
A physical certificate of authenticity is provided free of charge with every fossil we sell. This is our lifetime guarantee. The certificate, individually prepared for each fossil by Juan A. Poblador, an expert paleontologist, contains an accurate scientific description, and the certificate's validity can be verified online at all times. In addition, a 100% money-back guarantee is provided.
Details
標本
Rare pathological double-barbed rostral denticle of Onchopristis numidus - Cretaceous Sawfish
地質年代
Upper Cretaceous, Cenomanian stage ( 96 million years)
コンディション
Natural
Authenticity
Original/official
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