Acanthodii or acanthodians (sometimes called spiny sharks) is a paraphyletic class of extinct fish, sharing features with both bony fish and cartilaginous fish. In form they resembled sharks, but their epidermis was covered with tiny rhomboid platelets like the scales of holosteans (gars, bowfins). They represent several independent phylogenetic branch of fishes leading to the still-extantChondrichthyes.
The popular name "spiny sharks" is a partial misnomer for these early jawed fishes. The name was coined because they were superficially shark-shaped, with a streamlined body, paired fins, and a strongly upturned tail; stout, largely immovable bony spines supporting all the fins except the tail - hence, "spiny sharks"; in retrospect, however, their close relation to modern cartilaginous fish can lead them to be considered "stem-sharks". Fossilized spines and scales are often all that remains of these fishes in ancient sedimentary rocks. Although not sharks or cartilaginous fish, acanthodians did, in fact, have a cartilaginous skeleton, but their fins had a wide, bony base and were reinforced on their anterior margin with a dentine spine. The earliest acanthodians were marine, but during the Devonian, freshwater species became predominant.
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published: 14 Oct 2021
Sharks earliest ancestor the Acanthodii
short video about the Acanthodii
I do not own the music in the intro the rights belong to Universal Studios.
published: 13 Oct 2022
acanthodii
published: 15 Feb 2013
This is How I Say...acanthodii
How do you say acanthodii? I have started a project to not only let you hear how to say acanthodii and all other words in the dictionary, I’m also SHOWING you how to say acanthodii. This is a long and arduous project. If you can assist by donating at http://www.WatchBobOnYouTube.com/donate.html, every donation helps. You can also help by donating via Venmo using the GR code at the end of the video.
Thank you,
How to say acanthodii, how to pronounce acanthodii, how do I say acanthodii, como se dice acanthodii, como se diz acanthodii, how do you pronounce acanthodii, acanthodii, how do you say acanthodii, how should I pronounce acanthodii, how should I say acanthodii
published: 18 May 2021
Acanthodians: The "Spiny Sharks"
Acanthodians were an early group of jawed fishes, which are popularly known as "spiny sharks". This video examines this group as well as two different species belonging to it: Climatius and Acanthodes.
published: 02 Jan 2023
Acanthodii Origin & Saalient features
published: 31 Jan 2022
How to Pronounce acanthodii - American English
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published: 02 Dec 2017
Acanthodii-דגים - האקנתודי
התכנים הופקו בשיתוף בין אוניברסיטת תל-אביב והאוניברסיטה הפתוחה
פרופסור דוד עילם מאוניברסיטת תל אביב
המוצגים שייכים לבית הספר לזואולוגיה באוניברסיטת תל-אביב ולמוזיאון הטבע ע"ש שטיינהרדט
רשימת בעלי זכויות היוצרים
Credit List
אנו מודים לבעלי זכויות היוצרים על הרשות להשתמש בפריטים המופיעים בהרצאה זו.
We are grateful to the copyright holders who granted their permission to use the items that appear in this lecture.
Head-on view of a red lionfish
By Photo by Jens Petersen, Edited by User:Olegiwit (cloned in part of fins) and Fir0002 (removed spots and noise) - File:Pterois_volitans_Manado.JPG, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=3193877
Evolution of fishes from the Cambrian to the present as a spindle diagram. The width of the spindles are proportional to the number o...
published: 16 Nov 2022
The armored head fish and the Spiny sharks
GNATHOSTOMATA Pt.1/2
Part one about the Placoderms and Acanthodians, with first evidence of true jaws, S3X and living birth.
Part two : https://youtu.be/i2GlvrJf5kE
Music by White Bat audio https://www.youtube.com/@WhiteBatAudio
Thumbnail by RJ Palmer
Illustrations by Satoshi Kawasaki
Icons next to name indicate the diet:
🪱 Invertebrates
🦂 Marine arthropods
🦴 Detritivores
🐟 Fish
🦪 Shelly mollusks
🦐 Plankton / Micro-organisms
The whole Playlist: https://youtube.com/playlist?list=PLZFljdk_R2daQUpjwiAOvjlP8M0rt5a8H
Sources and more informations about the animals shown:
Brindabella - researchgate.net/publication/325876190_New_information_on_Brindabellaspis_stensioi_Young_1980_highlights_morphological_disparity_in_Early_Devonian_placoderms
Romundina - https://en.wikipedia.org/wiki/Romundina...
published: 21 Jul 2023
Evolution of Sharks (Transitional Fossil Acanthodians)
The Acanthodians were the ancestors to modern sharks.
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Watch Full Stream Vods ...
Live Content: https://www.twitch.tv/zakqary
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Watch Full Stream Vods Here: https://www.youtube.com/channel/UCe8Sdwx5LxJvdgxdF6kDGsw
Edited by: https://twitter.com/maargarinee_
I read most if not all comments, so feel free to ask questions, but If I don't get back to you, stop into a twitch stream or my discord and ill answer whatever you need.
Live Content: https://www.twitch.tv/zakqary
Join My Discord: https://discord.gg/QHAdUtfy52
Fish Twitter: https://twitter.com/ZakqaryFish
Watch Full Stream Vods Here: https://www.youtube.com/channel/UCe8Sdwx5LxJvdgxdF6kDGsw
Edited by: https://twitter.com/maargarinee_
I read most if not all comments, so feel free to ask questions, but If I don't get back to you, stop into a twitch stream or my discord and ill answer whatever you need.
How do you say acanthodii? I have started a project to not only let you hear how to say acanthodii and all other words in the dictionary, I’m also SHOWING you h...
How do you say acanthodii? I have started a project to not only let you hear how to say acanthodii and all other words in the dictionary, I’m also SHOWING you how to say acanthodii. This is a long and arduous project. If you can assist by donating at http://www.WatchBobOnYouTube.com/donate.html, every donation helps. You can also help by donating via Venmo using the GR code at the end of the video.
Thank you,
How to say acanthodii, how to pronounce acanthodii, how do I say acanthodii, como se dice acanthodii, como se diz acanthodii, how do you pronounce acanthodii, acanthodii, how do you say acanthodii, how should I pronounce acanthodii, how should I say acanthodii
How do you say acanthodii? I have started a project to not only let you hear how to say acanthodii and all other words in the dictionary, I’m also SHOWING you how to say acanthodii. This is a long and arduous project. If you can assist by donating at http://www.WatchBobOnYouTube.com/donate.html, every donation helps. You can also help by donating via Venmo using the GR code at the end of the video.
Thank you,
How to say acanthodii, how to pronounce acanthodii, how do I say acanthodii, como se dice acanthodii, como se diz acanthodii, how do you pronounce acanthodii, acanthodii, how do you say acanthodii, how should I pronounce acanthodii, how should I say acanthodii
Acanthodians were an early group of jawed fishes, which are popularly known as "spiny sharks". This video examines this group as well as two different species b...
Acanthodians were an early group of jawed fishes, which are popularly known as "spiny sharks". This video examines this group as well as two different species belonging to it: Climatius and Acanthodes.
Acanthodians were an early group of jawed fishes, which are popularly known as "spiny sharks". This video examines this group as well as two different species belonging to it: Climatius and Acanthodes.
התכנים הופקו בשיתוף בין אוניברסיטת תל-אביב והאוניברסיטה הפתוחה
פרופסור דוד עילם מאוניברסיטת תל אביב
המוצגים שייכים לבית הספר לזואולוגיה באוניברסיטת תל-אביב ול...
GNATHOSTOMATA Pt.1/2
Part one about the Placoderms and Acanthodians, with first evidence of true jaws, S3X and living birth.
Part two : https://youtu.be/i2GlvrJ...
GNATHOSTOMATA Pt.1/2
Part one about the Placoderms and Acanthodians, with first evidence of true jaws, S3X and living birth.
Part two : https://youtu.be/i2GlvrJf5kE
Music by White Bat audio https://www.youtube.com/@WhiteBatAudio
Thumbnail by RJ Palmer
Illustrations by Satoshi Kawasaki
Icons next to name indicate the diet:
🪱 Invertebrates
🦂 Marine arthropods
🦴 Detritivores
🐟 Fish
🦪 Shelly mollusks
🦐 Plankton / Micro-organisms
The whole Playlist: https://youtube.com/playlist?list=PLZFljdk_R2daQUpjwiAOvjlP8M0rt5a8H
Sources and more informations about the animals shown:
Brindabella - researchgate.net/publication/325876190_New_information_on_Brindabellaspis_stensioi_Young_1980_highlights_morphological_disparity_in_Early_Devonian_placoderms
Romundina - https://en.wikipedia.org/wiki/Romundina
Gemuendina - http://www.prehistoric-wildlife.com/species/g/gemuendina.html
Yunnanolepis - https://www.diva-portal.org/smash/get/diva2:952780/FULLTEXT01.pdf
Bothriolepis - http://www.prehistoric-wildlife.com/species/b/bothriolepis.html
Microbrachius - https://www.bbc.com/news/science-environment-29661446
Pterichthyodes - https://en.wikipedia.org/wiki/Pterichthyodes
Lunaspis - http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=34294
Campbellodus - https://www.researchgate.net/figure/Gogo-placoderms-A-ptyctodontid-Campbellodus-decipiens-WAM-1191-showing-articulated_fig1_326520650
Materpiscis - https://www.abc.net.au/science/articles/2008/05/29/2257284.htm
Phyllolepis - https://www.researchgate.net/publication/213772582_Phyllolepis_rossimontina_sp_novPlacodermi_from_the_Uppermost_Devonian_at_Red_Hill_North-Central_Pennsylvania
Austrophyllolepis - https://www.researchgate.net/figure/Austrophyllolepis-ritchiei-Long-1984-from-Mount-Howitt-eastern-Victoria-a-Holotype_fig6_213776635
Incisoscutum - http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=34352
Groenlandaspis - http://www.prehistoric-wildlife.com/species/g/groenlandaspis.html
Turrisaspis - http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=402690
Rolfosteus - http://www.prehistoric-wildlife.com/species/r/rolfosteus.html
Coccosteus - http://www.prehistoric-wildlife.com/species/c/coccosteus.html
Dunkleosteus - https://www.nytimes.com/2023/03/04/science/chunky-dunk-fossil.html
Titanichthys - http://www.prehistoric-wildlife.com/species/t/titanichthys.html
Brochoadmoanes - https://www.researchgate.net/publication/213771629_Anatomy_of_the_Early_Devonian_acanthodian_Brochoadmones_milesi_based_on_nearly_complete_body_fossils_with_comments_on_the_evolution_and_development_of_paired_fins
Ischnacanthus - https://www.mindat.org/taxon-P34865.html
Diplacanthus - https://www.mindat.org/taxon-P209448.html
Acanthodes - http://www.prehistoric-wildlife.com/species/a/acanthodes.html
Homalacanthus - http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=226280
Cheiracanthus - http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=209434
Climatius - http://www.prehistoric-wildlife.com/species/c/climatius.html
Gyracanthus - http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=209918
Parexus - http://www.prehistoric-wildlife.com/species/p/parexus.html
0:00 Introduction
0:45 Placodermi
1:30 Acanthothoraci
2:00 Rhenanida
2:40 Antiarchi
5:10 Petalichthyida
5:50 Pyctodontida
7:00 Arthrodira
7:30 Actinolepidoidei
8:10 Phllyctaenioidei
12:15 Acanthodii
13:05 Ischnacanthiformes
13:45 Diplacanthiformes
14:15 Acanthodiformes
16:00 Climatiiformes
Live Content: https://www.twitch.tv/zakqary
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Watch Full Stream Vods Here: https://www.youtube.com/channel/UCe8Sdwx5LxJvdgxdF6kDGsw
Edited by: https://twitter.com/maargarinee_
I read most if not all comments, so feel free to ask questions, but If I don't get back to you, stop into a twitch stream or my discord and ill answer whatever you need.
How do you say acanthodii? I have started a project to not only let you hear how to say acanthodii and all other words in the dictionary, I’m also SHOWING you how to say acanthodii. This is a long and arduous project. If you can assist by donating at http://www.WatchBobOnYouTube.com/donate.html, every donation helps. You can also help by donating via Venmo using the GR code at the end of the video.
Thank you,
How to say acanthodii, how to pronounce acanthodii, how do I say acanthodii, como se dice acanthodii, como se diz acanthodii, how do you pronounce acanthodii, acanthodii, how do you say acanthodii, how should I pronounce acanthodii, how should I say acanthodii
Acanthodians were an early group of jawed fishes, which are popularly known as "spiny sharks". This video examines this group as well as two different species belonging to it: Climatius and Acanthodes.
Acanthodii or acanthodians (sometimes called spiny sharks) is a paraphyletic class of extinct fish, sharing features with both bony fish and cartilaginous fish. In form they resembled sharks, but their epidermis was covered with tiny rhomboid platelets like the scales of holosteans (gars, bowfins). They represent several independent phylogenetic branch of fishes leading to the still-extantChondrichthyes.
The popular name "spiny sharks" is a partial misnomer for these early jawed fishes. The name was coined because they were superficially shark-shaped, with a streamlined body, paired fins, and a strongly upturned tail; stout, largely immovable bony spines supporting all the fins except the tail - hence, "spiny sharks"; in retrospect, however, their close relation to modern cartilaginous fish can lead them to be considered "stem-sharks". Fossilized spines and scales are often all that remains of these fishes in ancient sedimentary rocks. Although not sharks or cartilaginous fish, acanthodians did, in fact, have a cartilaginous skeleton, but their fins had a wide, bony base and were reinforced on their anterior margin with a dentine spine. The earliest acanthodians were marine, but during the Devonian, freshwater species became predominant.