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[爆卦]placoderm claspers是什麼？優點缺點精華區懶人包
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#1Placodermi - Wikipedia
The placoderm claspers are not homologous with the claspers in cartilaginous fishes. The similarities between the structures has been revealed to be an ...
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#2Copulate to populate: ancient Scottish fish did it sideways
Placoderm claspers were at first fixed rigidly to their body plates as in Microbrachius so the fish had to move its entire body around to mate.
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#3Placoderms, Pre-Historic Life, Biology, SUNY Orange
One type of placoderm is known to have had claspers like male sharks (Perrinne, 1999). One group of placoderms possesses male claspers which supports their ...
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#4Molecular development of chondrichthyan claspers ... - Nature
The earliest known vertebrate copulatory organs are claspers, paired penis-like structures that are associated with evolution of internal ...
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#5Pelvic and reproductive structures in ... - ResearchGate
2021年7月23日 — Claspers in placoderms and chondrichthyans develop in very different ways; in sharks, claspers develop from the pelvic fin while the ...
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#6The Relationship of Placoderms - jstor
A new phylogeny of placoderms is proposed in which the ptyctodonts are ... placoderm relationships, pelvic and prepelvic claspers.
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#73.2 Placoderms - Learning to Bite | Coursera
The most primitive jawed vertebrates are the heavily armoured placoderms. ... What kind of evolution are shark and placoderm claspers an example of?
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#8Copulation in antiarch placoderms and the origin of ...
Male copulatory claspers are present in certain placoderms, fossil jawed vertebrates retrieved as a paraphyletic segment of the gnathostome stem group in ...
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#9Sharks: Missing Piece Of Fossil Puzzle Found - ScienceDaily
The authors looked for a clasper in their placoderm fossils but couldn't find one, so they were forced to argue that it had been made of ...
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#10Placoderm Life Histories | SpringerLink
Within antiarchs, the reproductive structures include bony claspers in males, which aid in the delivery of sperm, and genital plates in females ...
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#11A preliminary note of egg-case oviparity in a Devonian ...
Placodermi McCoy, 1848, of claspers (an intromittent ... the placoderm clasper may represent a developmen-.
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#12placoderm - Translation into Portuguese - examples English ...
Translations in context of "placoderm" in English-Portuguese from Reverso Context: The placoderm claspers are not homologous with the claspers in ...
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#13A review of recent discoveries of exceptionally preserved ...
Recent studies have elucidated the nature of placoderm claspers, ... a description of well-preserved muscles in placoderms, and how muscles ...
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#14Extraordinary Fossil Reveals the Origin of Mating by Copulation
Placoderms, the most primitive jawed vertebrates, ... antiarch group of placoderms, developed bony L-shaped genital limbs called claspers to ...
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#15Bayesian Morphological Clock Methods Resurrect Placoderm ...
Key to the early evolution of jawed vertebrates is the placoderms, ... The discovery that dermal claspers and therefore internal fertilization is apparently ...
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#16Gnathostomata and Placodermi - GEOL431 - Vertebrate ...
described the fossil of a pregnant placoderm confirmed this. Placoderm claspers after Trinajstic et al.2015. During the 20th century, this led to confusion ...
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#17Copulation in antiarch placoderms and the origin - ProQuest
The clasper morphology resembles that of ptyctodonts, amore crownward placoderm group7,8, suggesting that all placoderm claspers are homologous and that ...
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#18Digitala Vetenskapliga Arkivet - DIVA
Pelvic claspers confirm chondrichthyan-like internal fertilization in ... fossil, vertebrate, reproduction, Devonian, placoderm, clasper ...
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#19Placoderm Reproduction
Placoderms are thought to be the first fish to reproduce by internal fertilization ... Claspers are modified structures at the base of the pelvic fins which ...
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#20Science News : Tags : vertebrate_evolution - NaturePlus
We review recent information on placoderm embryos as well as previous ... Claspers in placoderms and chondrichthyans develop in very different ways; ...
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#21(PDF) Copulation in antiarch placoderms and ... - Academia.edu
1h, j, k), potentially enabling a male certain placoderm subgroups. The reproductive biology of antiarchs, Microbrachius clasper to reach the cloaca of a ...
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#22Placoderm Assemblage from the Tetrapod-Bearing Locality of ...
The placoderm fauna of the upper Famennian tetrapod-bearing ... Ahlberg P, Trinajstic K, Johanson Z, Long J. Pelvic claspers confirm ...
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#23A Bayesian approach to dynamic homology of morphological ...
The homology relations of placoderm jaw bones have implications for ... Putative core placoderm synapomorphies (claspers, optic fissure) are ...
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#24Placodermi - Wikiwand
The placoderm claspers are not homologous with the claspers in cartilaginous fishes. The similarities between the structures has been revealed to be an ...
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#25Dawn of the Deed, Part 2: Palaeozoic Paternity Problems ...
Placoderms were the dominant group of early jawed fishes in Devonian seas, rivers, ... Do these strange, bony, placoderm claspers have anything at all to do ...
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#26The First Genital In An Animal Evolved From An Extra Pair Of ...
A recent analysis of placoderm fossils — an early jawed vertebrate — shows that the animal kingdom's first genital organ was a "clasper" ...
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#27MEETING PROGRAM & ABSTRACTS - Docentes FCT/UNL
Placoderms (stem gnathostomes) preserve the earliest evidence of vertebrate ... The discovery that placoderm claspers were not part of the.
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#28Devonian arthrodire embryos and the origin of internal ...
phyletic grouping of placoderms and chondrichthyans, which assumes claspers might have been present in other placoderm groups27.
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#29Swedish researcher finds missing piece of fossil puzzle
The authors looked for a clasper in their placoderm fossils but couldn't find one, so they were forced to argue that it had been made of ...
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#30How shark 'penises' evolved | Science | AAAS
How did animals like sharks and skates evolve claspers—paired penislike organs ... The same mechanism could explain how claspers developed in placoderms—the ...
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#31Molecular development of chondrichthyan ... - CiteSeerX
placoderms. Today, only male chondrichthyans possess claspers, which extend from posterior pelvic fins and function as intromittent organs.
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#32中文 首页 馆情总览 馆长寄语 本馆介绍 组织机构 规章制度 服务窗口 ...
关键词：placoderm embryo Scotland viviparity histology Devonian INTERNAL ... 关键词：placoderm pelvic girdle clasper organ internal fertilisation ...
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#33chondrichthyan - Evolution and classification | Britannica
During their flowering, the placoderms evidently gave rise to the ... internal fertilization [for which the males have claspers], and the absence of a swim ...
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#34which came first, internal or external fertilization? - Oceanbites
Sure enough they found a “clasper-based” system for internal fertilization among antiarch placoderms. On the outer lower parts of the backsides (posterior ...
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#35How sharks and rays claspers evolved - Deutsche ...
The same mechanism could explain how claspers developed in placoderms—the extinct, armored fish with the earliest known vertebrate sex organs—as ...
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#36Use placoderm in a sentence - RhymeZone
The placoderm claspers are not homologous with the claspers in cartilaginous fishes. —Placodermi [Similar quotes, lyrics]. Dunkleosteus is an extinct genus ...
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#37Copulation in antiarch placoderms and the origin of gnathostome ...
Male copulatory claspers are present in certain placoderms 2, 3, 4, fossil jawed vertebrates retrieved as a paraphyletic segment of the gnathostome stem ...
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#38Loss in the making: absence of pelvic fins and presence of ...
(a) Bothriolepis pelvic girdle and fins among placoderms ... with male claspers gripping the internal ornament of the female genital plates ...
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#40[PDF] Copulation in antiarch placoderms and the origin of ...
Male copulatory claspers are present in certain placoderms, fossil jawed vertebrates retrieved as a paraphyletic segment of the gnathostome ...
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#41Practice Questions on Chapter 3
Match each placoderm group with its characteristics. ... Minimal body armor, tapered fusiform body with ventral claspers. Skate-like body and fins covered ...
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#42Placoderms - The Dino Sirs
The closest analogue to these claspers in modern vertebrates is the pelvic claspers of cartilaginous fish. Male sharks and rays have an ...
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#43Ptyctodontida - Palaeos Vertebrates Placodermi
The Ptyctodontids were the only known group of placoderms that were verifiably ... believe that the males of the ancestral placoderm had pelvic claspers, ...
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#44New morphological information on ... - Taylor & Francis Online
... three-dimensionally preserved, placoderm fish, Materpiscis attenboroughi ... chondrichthyan pelvic fins and reproductive structures (claspers) suggest ...
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#45Placodermi - Main Page
The placoderm claspers' are not homologous with the claspers in cartilaginous fishes. The similarities between the structures has been revealed to be an ...
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#46Health & Environmental Research Online (HERO) | US EPA
... organs are claspers, paired penis-like structures that are associated with evolution of internal fertilization and viviparity in Devonian placoderms.
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#47Book Excerpt from The Dawn of the Deed - The Scientist ...
... John Long pays homage to the humble placoderm, which got the erotic ball rolling. ... From Clasper to Penis: We've Come a Long Way, Baby.
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#48Placoderm double penis: not the primitive trait they think it is
2014 paper, the presence of bony claspers (shark-like dual lateral penises) does not signal the origin of gnathostome internal fertilization on ...
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#49Lecture 3 - Early Fishes
Placoderms. 7. Chondrichthyes ... characteristics of both Placoderms and Osteichthyans ... Internal fertilization with claspers.
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#50The Best Australian Science Writing 2015 - Google 圖書結果
The arthrodires were the most diverse clade of placoderms. ... In early 2014 we added to this by showing that placoderm claspers did not develop in the same ...
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#51Australia's First Four Billion Years | Devonian Fish Fossils
... learns about the oldest confirmed male appendage (a clasper of a placoderm, ... of live birth in a vertebrate (a mother placoderm with her unborn embryo).
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#52Origins of copulation - ancient Scottish fishes did it sideways
Placoderm claspers were at first fixed rigidly to their body plates as in Microbrachius so the fish had to move its entire body around to mate. More advanced ...
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#53About: Ptyctodontida - DBpedia
The Ptyctodontida were the only known group of placoderms that were recognizably ... believe that the males of the ancestral placoderm had pelvic claspers, ...
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#54Fossil embryos reveal prehistoric reproduction secrets
... of embryos within fossil specimens of primitive jawed fishes (placoderms), ... like the claspers of sharks that are used for internal fertilization.
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#55More about Placoderms - Devonian Times
Placoderms are arguably the most diverse groups of the early jawed fishes ... The males of one ptyctodontid, Rhamphodopis, have clasper-like ...
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#56B2 Gnathostomes Chondrichthyes Flashcards | Quizlet
teeth* (extant species do but might not be true for placoderms) ... males w/ pelvic fins modified into claspers (not the same as placoderm claspers)
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#57definition of claspers by The Free Dictionary
"Our finds show that these extinct armored fishes, the placoderms, had intimate copulation with males inserting claspers (a structure that is part of the ...
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#58Customer reviews: The Dawn of the Deed: The ... - Amazon.com
In the case of Dr. Long's specimen, a small Devonian Placoderm, it's length at just under a ... an umbilical cord and "claspers" for internal fertilization.
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#59Full Text Journal Articles by Author Gavin C Young
Male copulatory claspers are present in certain placoderms, fossil jawed vertebrates retrieved as a paraphyletic segment of the gnathostome stem group in ...
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#60Jawed Fishes | Biology for Majors II - Lumen Learning
Dunkleosteous was an enormous placoderm from the Devonian period, ... fins (in males these may be modified as claspers), exposed gill slits (elasmobranch), ...
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#61Primitive Penises: Better to have gained and lost than to never ...
Much like the claspers in modern-day sharks, the placoderm claspers are thought to transfer sperm across the pelvic plates, ...
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#62placoderm meaning - Ichacha
The earliest known fish with jaws are the now extinct placoderms and spiny sharks. The placoderm claspers are not cartilaginous fishes.
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#63What are the func,ons of copulatory (intromitent) organs? - UW ...
Placoderm maBng. Long, Mark-Kurik, Johanson, et al. 2014. Chondrichthyes have car,laginous claspers. ... Clasper length (LC), & stretch total length (LST ).
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#64New Morphological Information on the Ptyctodontid ... - BioOne
Moreover, similarities in placoderm and chondrichthyan pelvic fins and reproductive structures (claspers) suggest early parallel expression ...
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#65Placodermi ~ Everything You Need to Know with Photos
Placodermi Virtual museum Placodermi Placoderms ... The placoderm claspers are not homologous with the claspers in cartilaginous fishes.
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#66Those Plucky Placoderms - Everything Dinosaur Blog
New research suggests that the Placoderm Microbrachius dicki may have ... “The male had large bony claspers, These are the grooves that they ...
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#67Sydney Brenner's 10-on-10: The Chronicles Of Evolution
E. primordialis is significant because it is the first placoderm with a ... indicating that placoderm claspers and the mammalian penis probably had a deep ...
placoderm 在 異色檔案 Youtube 的最佳解答
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【5種滅絕的遠古野獸】第2名長得太詭異..
你看過哪幾種呢？
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由 Creator:Dmitry Bogdanov - dmitrchel@mail.ru, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=5261865
English: Artist's impression of a Dunkleosteus.
Nederlands: Artistieke impressie van een Dunkleosteus.
Dunkleosteus terrelli (fossil fish) (Cleveland Shale Member, Ohio Shale, Upper Devonian; Rocky River Valley, Cleveland, Ohio, USA) 26
A skull diagram of the placoderm fish Dunkleosteus.
• Based on figure 1 in Anderson, P.S.L. and Westneat, M.W. (2006) "Feeding mechanics and bite force modelling of the skull of Dunkleosteus terrelli, an ancient apex predator", Biology letters, pp 76-79.
Di Sergio Alexandro - [1]Uploaded by Snowmanradio, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=7608675
John Megahan - Ancient DNA Tells Story of Giant Eagle Evolution. PLoS Biol 3(1): e20. doi:10.1371/journal.pbio.0030020.g001
Helicoprion bessonovi - edestid "shark" from Early Permian (Artinskian) of Ural region. Highly hypotetical reconstruction.
由 Gerbil - Forschungsinstitut Senckenberg, Frankfurt am Main, Germany, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=939356
CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=61305990
Music provided by Non Copyrighted Music:
https://youtu.be/xAoedjZnvqQ
Music used: Ghost Story by Kevin MacLeod
(incompetech.com)
Licensed under Creative Commons Attribution 3.0
https://creativecommons.org/licenses/...
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