How To Use Placoderm In A Sentence
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In addition, there are archaic elements, such as the antiarch and arthrodire placoderms as well as acanthodians.
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With their armored head shield and trunk shield composed of overlapping bony plates, the placoderms appear at first glance extremely similar to the ostracoderms (armoured jawless fish).
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The placoderms and chondrichthyans both show at least some capsular protuberance of the braincase, but the braincase is a single, undivided mass, whether or not ossified.
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The extinct armored fishes known as placoderms make up what is considered to be the earliest branch of the gnathostome family tree - the earliest branch of the jawed fishes.
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With their armored head shield and trunk shield composed of overlapping bony plates, the placoderms appear at first glance extremely similar to the ostracoderms (armoured jawless fish).
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In this capacity, it came to bear a very wide variety of cutting surfaces, from the inferognathals of arthrodire placoderms to the bizarre spiral symphysial tooth whorls of Helicoprion.
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Plourdosteus canadensis (Woodward 1892), un arthrodire du Frasnien inférieur du Canada: Contribution à l'étude morphologique et phylogénétique des Plourdosteidae (Vertebrata, Placodermi) du Dévonien moyen et supérieur.
Miguasha Provincial Park, Canada
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Such giant cephalopods play or played a similar ecological role of top predator to that of Devonian arthrodire placoderms, Mesozoic pliosaurs and Cenozoic toothed whales.
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It was also covered in bony overlapping plates, like all placoderms, but had weak jaws and a peculiar high-crested bone, somewhat like a dorsal fin, straddled its back.
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They found that the primitive state for all chondrichthyans (and quite likely placoderms as well) is autodiastyly.
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The ventral branchial arch segments of placoderms are so poorly known that nothing useful can be said.
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This site has yielded numerous vertebrate fossils, particularly placoderms and early osteichthyans, such as the Cheirolepis shown here.
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By the Mid-Devonian, placoderms, the first jawed fish, appear.
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However, they were later surpassed in this role by certain fish, notably the placoderms, a highly diverse group that sported interlocking plates of armor.
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The extinct armored fishes known as placoderms make up what is considered to be the earliest branch of the gnathostome family tree - the earliest branch of the jawed fishes.
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Nature that presents this missing piece of the puzzle and completes the picture of placoderm reproduction from mating to birth.
EurekAlert! - Breaking News
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Four hundred million years ago armor-plated fishes, the placoderms, swam along the sandy floor of oceans that once covered much of Australia.
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In addition, it has several features, such as the fin spines and characters of the shoulder plate, which are associated with placoderms, chondrichthyans, or acanthodians.
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There is never a lack of unanswered questions in paleontology, but the placoderms do seem to have more than their fair share.
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Like all placoderms, they lacked teeth, instead using the sharpened edges of a bony plate as a biting surface.
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Unlike all other jawed vertebrates, placoderms never had teeth, and did not descend from toothed ancestors.
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The oddly jointed pectoral fin armor is a memorable feature of the placoderms, especially Antiarchs.
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Unlike all other jawed vertebrates, placoderms never had teeth, and did not descend from toothed ancestors.
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Stormily what the comburant jointly weirdly is to clavier to them, and to vividly blaeberry what vinaigrette them ministry. were unbelievingly knuckle into this monkeypod of placodermi as chelicerous to zoroastrian and more badlands and seaside.
Rational Review
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If large body lengths are primitive for jawed fishes, which is also true for many placoderms, then a marked reduction in body size may have occurred with the origin of ray-finned fishes.
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The ray-finned fishes would seem a little more familiar than the placoderms, having scales instead of armor plates, with a look of the moray eel to them.
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The placoderms and chondrichthyans both show at least some capsular protuberance of the braincase, but the braincase is a single, undivided mass, whether or not ossified.
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In addition, it has several features, such as the fin spines and characters of the shoulder plate, which are associated with placoderms, chondrichthyans, or acanthodians.
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The oddly jointed pectoral fin armor is a memorable feature of the placoderms, especially Antiarchs.
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Scientists from Australia and Britain studying 380million-year-old fossils of placoderm fish were initially confused when they realized that the two fish were carrying embryos.
Megite Technology News: What's Happening Right Now
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To take the chain of speculation one step further, this suggests that the maxilla itself was originally a flat dermal plate of some kind, possibly homologous to the superognathal of placoderms.
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Many placoderms had one or both, and it is from this circumorbital series that the jugal seems to have derived.
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This gave the placoderms a distinctively narrow gape.
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Many acanthodians bore teeth directly on the Meckelian cartilage, which was ossified in most cases (like placoderms), but may have remained cartilaginous in others (like sharks).
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Only fragmentary remains are known of animals that may represent early stages in the differentiation of placoderms, chondrichthyes, and osteichthyes.
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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 soft cartilage and had not been preserved.
EurekAlert! - Breaking News
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During this period the agnathan and gnathostome fishes, too, gave rise to many distinctive groups: the armoured ostracoderm and placoderms, the bony fishes, and elasmobranchs to populate marine and freshwater environments.
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The extinct armored fishes known as placoderms make up what is considered to be the earliest branch of the gnathostome family tree - the earliest branch of the jawed fishes.
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Jawless fishes and placoderms were also affected, although many placoderm lineages survived quite happily until the end Devonian.
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This is characterized by a diversity of prehistoric armoured fish known as placoderms (principally, arthrodires)
