CHE SIGNIFICA PLACODERM IN INGLESE
Placodermi
Il Placodermi è una classe estinta di pesci preistorici armati, noti dai fossili, che vivevano dal Silurio fino alla fine del periodo del Devoniano. La testa e il torace erano coperti da piastre corazzate articolate e il resto del corpo era scalato o nudo, a seconda della specie. I placodermi erano tra i primi pesci mignolati; Le loro mascelle probabilmente si sono evolute dal primo dei loro archi a sfera. I placodermi sono paraphyletici e comprendono diversi outgroup distinti o taxa sorelle a tutti i vertebrati mignolanti, che hanno origine tra i loro ranghi. Questo è illustrato da un fossile 419 milioni di anni, Entelognathus, dalla Cina, che è l'unico placoderm conosciuto con un tipo di mascella ossea come quello dei pesci ossi moderni. Questo include un osso dentario, che si trova negli esseri umani e altri tetrapodi. Le ganasce in altri placodermi sono state semplificate e consistono in un singolo osso. I placodermi furono anche il primo pesce a sviluppare alette pelviche, il precursore di arti inferiori in tetrapodi, così come veri denti. Fossili di 380 milioni di anni di altri tre generi, Incistoscutum, Materpiscis e Austroptyctodus rappresentano il più antico esempio di nascita viva.
definizione di placoderm nel dizionario inglese
La definizione di placoderma nel dizionario è qualsiasi vertebrato estinto placcato ossuto di pesce della classe Placodermi, dal Siluriano ai tempi di Permiano: si pensava che fossero i primi vertebrati con le mascelle.
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10 LIBRI IN INGLESE ASSOCIATI CON «PLACODERM»
Scopri l'uso di
placoderm nella seguente selezione bibliografica. Libri associati con
placoderm e piccoli estratti per contestualizzare il loro uso nella letteratura.
1
Functional Morphology in Vertebrate Paleontology
Dorsal view of skull table of placoderm. (a) morphology and jaw function in the
transitions among what were then called "chondrosteans," "holosteans," and "
teleosts." They demonstrated changes in the suspensorium and palate that
produce a ...
This presumably more advanced feature, is a characteristic of the more highly
evolved placoderm desmids. In both genera, the chloroplasts are axile and star-
shaped in cross-section, but the indentations of the margins are much less ...
3
Gondwana Six: Stratigraphy, Sedimentology, and Paleontology
Young, G. C., Stratigraphic occurrence of some placoderm fishes in the Middle
and Late Devonian, Nevsl. Stratigr., 3, 243-261, 1974. Young, G. C.~, A new
Early Devonian petalichthyid fish from the Taemas/Wee Jasper region of New
South ...
4
The Skull, Volume 2: Patterns of Structural and Systematic ...
The palatoquadrate may ossify in one, two, or three units — the placoderm
autopala- tine, quadrate, and metapterygoid, respectively. The connection of the
palatoquadrate with the endocranium is variable. In ptyctodonts, the
palatoquadrate is ...
James Hanken, Brian K. Hall,
1993
5
Mountains of Madness: A Scientist's Odyssey in Antarctica
One of the specimens I collected that day was very strange: an elongated median
dorsal plate from a moderately large placoderm hav- ing very coarse, wart-like
ornamentation all over its external surface. I suspect that it is probably a new ...
John Long, Tim Bowden,
2001
6
Vertebrate Endocrinology
Hinged jaws developed in the placoderm fishes from modifications of the first gill
arch, and this same event can be observed early in embryonic development of all
jawed vertebrates. Many zoologists consider development of jaws to be the ...
David O. Norris, James A. Carr,
2013
7
Earth and Life: Global Biodiversity, Extinction Intervals ...
... the former including newly described agnathans (e.g. Newman and Trewin
2001; Newman 2002) and the latter with ontogenetic series of placoderm and
acanthodian species (Upeniece 2001). The only marine deposit of this type yet
found ...
8
Concepts of Biology XII
Giant and ferocious looking placoderm fish Dinichthys was about 10 meter long (
Fig. 3). Placoderm fishes slowly disappeared. These fishes gradually evolved
into lung fishes. Three species of lung fishes occur these days. Some other kinds
of ...
Prof. Kotpal, Dr. Tyagi, Dr. Bendre, & Dr. Pande
Parexus (acanthodian) (c) (d) Skull Mouth Cheirolepis (ray-finned) Bothriolepis (b
) (placoderm) Hemicyclaspis (ostracoderm) (a) Figure 13.6 Devonian Seafloor
Recreation of a Devonian seafloor showing (a) an ostracoderm, (b) a placoderm,
...
Reed Wicander, James Monroe,
2012
10
Frozen in Time: Prehistoric Life in Antarctica
Head shield of groenlandaspid placoderm from the mid-Devonian Aztec Siltstone
, Mt Crean, East Antarctica. photo: John long. Another common placoderm from
the Aztec Siltstone is the arthrodire Groenlandaspis, known from one named ...
Jeffrey Stilwell, John Long,
2011
10 NOTIZIE DOVE SI INCLUDE IL TERMINE «PLACODERM»
Vedi di che si parla nei media nazionali e internazionali e come viene utilizzato il termine ino
placoderm nel contesto delle seguenti notizie.
Four hundred million year old fish fossil has earliest example of teeth
Acanthothoracid placoderm and surface renderings (gold) of Romundina stellina and Compagopiscis croucheri. Upper dental plates (anterior ... «Phys.Org, giu 15»
First-known teeth belonged to fierce fish
Romundina is a placoderm, meaning an extinct class of armoured fish. Older remains of this fish and related species have been found, but ... «ABC Science Online, giu 15»
No bones about it: sharks evolved cartilage for a reason
Gogo has a diverse fauna of many kinds of ancient armoured placoderm fishes as well as early bony fishes (osteichthyans), but no sharks. «The Conversation AU, mag 15»
Palaeontology: Tracing the backbone in China's rocks
Entelognathus from Xiaoxiang, for example, is a placoderm, or armoured fish, with the jawed face of an osteichthyan, or bony fish — a finding ... «Nature.com, mag 15»
Hong Kong's First Dinosaur-Era Fish Identified
Hong Kong's last major vertebrate fossil identification was the discovery of a ~370 million-year-old early fish (Devonian-aged placoderm fish) ... «Asian Scientist Magazine, apr 15»
Hong Kong''s first identified dinosaur-era vertebrate
Hong Kong's last major vertebrate fossil identification was the discovery of a ~370 million-year-old early fish (Devonian-aged placoderm fish) ... «Phys.Org, apr 15»
Dinosaur-era fish find proves quite a catch
A 370-million-year-old early Devonian-aged placoderm fish was the last major vertebrate fossil to be identified in Hong Kong. That was 35 ... «Hong Kong Standard, mar 15»
Birth of jaws: Tiny fish may be ancient ancestor
Placoderm image courtesy of K. Trinajstic). The remains of a 415-million-year-old fish skull from Siberia though miniscule in size offer hints ... «Fox News, gen 15»
The 300th article at Tet Zoo ver 3 is very weird
If you're wondering, the section on jawless fishes is finished, the placoderm section is essentially finished (updates are needed in view of the ... «Scientific American, dic 14»
Feschuk: The latest breaking news! (From eons ago)
First, they were part of a placoderm group known as Microbrachius dicki. (Dicki? Are any of these scientists not 11 years old?) Second, these ... «Macleans.ca, ott 14»