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

05
days
10
hours
48
minutes
19
seconds
Starting bid
€ 1
Reserve price not met
Sullivan Halipré
Expert
Estimate € 280 - € 350
No bids placed

Catawiki Buyer Protection

Your payment’s safe with us until you receive your object.View details

Trustpilot 4.4 | 140652 reviews

Rated Excellent on Trustpilot.

Description from the seller

科学名: Onchopristis numidus - ノコギリザメの吻部歯 - 真正な異常または病的な二刺の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: いわゆる“歯”と呼ばれる Onchopristis numidus のものは、実際には吻部の側方に配列された改変された吻端歯であり、ノコギリ状の吻部に沿って並んでいた。これらの要素は北アフリカの白亜系堆積物、特にモロッコのKem Kem Beds で比較的よく見られるが、二つの明確な尖端や棘を持つ異常な形態を示す標本はかなり稀である。

この異常の重要性は科学的に記録されている。 O. numidus の異常 denticles の特定の研究は、後縁に少なくとも二つの棘を有する標本を記述し、それが必ずしも別種を意味するものではなく、 Onchopristis numidus の異常または病理的な形態であると結論づけた。

著者らはまた、この種の正常な標本が Kem Kem 堆積物で豊富である一方で、これらの病的形態は時々しか出現しないと指摘している。

その後の研究は、これらの希少性と真偽性に関するさらなる証拠を提供している。多棘歯 denticles は断面化とマイクロCT 技術を用いて検討された。あるケースでは、標本は異なる個体の部品をつなぎ合わせることで操作されたことが判明し、別の真の二棘歯 denticle は断面化され、人工的改変の証拠を示さなかった。これにより、異常は実際に O. numidus に生じたものであると確認され、同時にコレクターへ提供される優れた標本の真偽認証の重要性が強調された。

Our specimen について: 本標本には接着時の亀裂があるが、詳細な検査の結果、この吻部歯は非常に特別で真性のものであり、二重の棘denticle を示すが、人工的改変の痕跡は認められなかった。

すべての化石には真実性証明書(Certificate of Authenticity)が付属します。毎週、発行された真実性証明書はウェブサイトのデータベース検証システムで更新されます。証明書がまだ更新されていない場合はご連絡ください。すぐに更新します。表示箱は付属していません。

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.

科学名: Onchopristis numidus - ノコギリザメの吻部歯 - 真正な異常または病的な二刺の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: いわゆる“歯”と呼ばれる Onchopristis numidus のものは、実際には吻部の側方に配列された改変された吻端歯であり、ノコギリ状の吻部に沿って並んでいた。これらの要素は北アフリカの白亜系堆積物、特にモロッコのKem Kem Beds で比較的よく見られるが、二つの明確な尖端や棘を持つ異常な形態を示す標本はかなり稀である。

この異常の重要性は科学的に記録されている。 O. numidus の異常 denticles の特定の研究は、後縁に少なくとも二つの棘を有する標本を記述し、それが必ずしも別種を意味するものではなく、 Onchopristis numidus の異常または病理的な形態であると結論づけた。

著者らはまた、この種の正常な標本が Kem Kem 堆積物で豊富である一方で、これらの病的形態は時々しか出現しないと指摘している。

その後の研究は、これらの希少性と真偽性に関するさらなる証拠を提供している。多棘歯 denticles は断面化とマイクロCT 技術を用いて検討された。あるケースでは、標本は異なる個体の部品をつなぎ合わせることで操作されたことが判明し、別の真の二棘歯 denticle は断面化され、人工的改変の証拠を示さなかった。これにより、異常は実際に O. numidus に生じたものであると確認され、同時にコレクターへ提供される優れた標本の真偽認証の重要性が強調された。

Our specimen について: 本標本には接着時の亀裂があるが、詳細な検査の結果、この吻部歯は非常に特別で真性のものであり、二重の棘denticle を示すが、人工的改変の痕跡は認められなかった。

すべての化石には真実性証明書(Certificate of Authenticity)が付属します。毎週、発行された真実性証明書はウェブサイトのデータベース検証システムで更新されます。証明書がまだ更新されていない場合はご連絡ください。すぐに更新します。表示箱は付属していません。

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
スペインVerified
351
Objects sold
100%
protop

Similar objects

For you in

化石