havily armoured body cover of ostracoderms

Another word for ARMOUR > Synonyms & Antonyms

Example sentences of the word armour . 1. Noun, plural Develop techniques for drawing angel wings, swords and armour individually before melding the ideas into the final image. 2. Noun, singular or mass Develop the folds and bends in the clothing and armour by adding shadows into the outline. 3.

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GEOL 102 The Middle Paleozoic: The Silurian & Devonian

"Ostracoderms": Armored jawless fish A grade, not a clade) Front ends generally heavily mineralized, rears covered with smaller scales Mostly sediment feeders "Placoderms": Jawed fish Typically did not have teeth, but instead a ridge of bone for cutting (a few have some teeth)

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Chapter 18 Vertebrata Flashcards | Quizlet

1. endoskeleton- permits larger body size w greater economy of building material 2.exoskeleton-highly modified in vertebrates 3.digestive sys-shift from movement of food by ciliary action 4.cardiovascular sys-5.excretory sys 6.brain 7.sensory organs 8. Hox genes

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The three element types of a conodont-animal. A. Simple, M ...

The three element types of a conodont-animal. A. Simple, M-element coniform with only a small base. That evolved later on to a coniform as part of a bar that is monopolized with many smaller ...

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2.1 Our Fish-like Ancestors - Learning to Swim | Coursera

To learn more about the vertebrate body plan, and how it evolved from that of its soft-bodied ancestors, we have to turn to the extinct, armored agnathans, the ostracoderms. We'll be examining the features of three major groups of ostracoderms in this lesson. They're called the Pteraspidomorphi, the Thelodonti, and the Osteostraci.

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: Telegaming Samsung A10e Case, Galaxy A10e Case ...

Telegaming Samsung Galaxy A10e Case new case with Belt Clip Holster Material: Made from high quality soft rubber gel around Design: 3 pieces combo ★ Easy to install and remove. ★ Perfectly match with your phone's shape and make your phone personalized and absorbing. ★ Unique design allows easy access to all buttons, controls & ports without having to remove the case. ★ It can ...

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Topic 16: Phylum Chordata - Auburn University

BIOL 1030 – TOPIC 16 LECTURE NOTES B. characteristics 1. head with brain and skull 2. vertebral column – during development in most (all but Myxini), surrounding and ultimate replacement of notochord by bony or bone-like, hollow vertebrae; also, encase brain in protective box (skull or cranium) of bone or cartilage 3. neural crest ectoderm – a unique set of stem cells that form near ...

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Middle Paleozoic (Chapter 12) - UH

2. Jawless fish of the early Paleozoic are collectively called ostracoderms. These early jawless fish had a simple, ring-like opening for a mouth and probably filtered food either out of the mud on the seafloor or directly from seawater. 3. Figures 11-9 & 11-10: Some of the early jawless fish were armored only with isolated bony scales and ...

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Flow pattern around the rigid cephalic shield of the ...

Palaeozoic armoured agnathans (or ostracoderms) are characterised by having an external, bone shield enclosing the anterior part of their bodies, which demonstrate great diversity of both forms ...

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lab total.docx - Vertebrate Integument Lab Introduction ...

Fossil Fish - Dermal Bone: A subphylum of Vertebrates consists of all of fish, amphibians, birds and mammals. Dermal Bone is present in two groups of ancient armored fished that are extinct: o Ostracoderms: These were from 530 million years ago. (earliest armored fish) They were Jawless and heavily armored. They were predators and also prey for some other fishes o Placoderms: Evolved …

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Evolution of fish - Wikipedia

The evolution of fish began about 530 million years ago during the Cambrian explosion.It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates.The first fish lineages belong to the Agnatha, or jawless fish.Early examples include Haikouichthys.During the late Cambrian, eel-like jawless fish called the conodonts ...

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BIL 160 - Lecture 19a - Miami

Fin rays are composed of cartilage or bone. Dermal scales protrude through the epidermis and shed readily. Skin copiously supplied with mucous glands. muc ous is an adjective. muc us is a noun. Fins are either medial and unpaired, or lateral and paired (see photo) Toothy, terminal (i.e., at the end of the body…

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Introduction to the Vertebrata (Cuvier 1812)

Stem gnathostomes, 'Ostracoderms' Paraphyletic group of 5 superclasses, all extinct. Late Cambrian to Triassic, very diverse during the Devonian. Nested taxa, mainly bottom-dwelling forms. Most heavily armored with dermal bone. Likely sifted the bottom mud for small animals. Evolution of paired appendages. Tails . heterocercal (epicercal ...

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When monsters ruled the water: The Age of Fishes | Earth ...

JulioLacerda. It was a time when the oceans and rivers of the world were ruled by aliens with armored bodies and slicing bony blades in their mouths. Welcome to the Devonian, the Age of Fishes, when these creatures were at the height of their strangeness. Fish are the most numerous vertebrates on Earth today, outnumbering the others 10 to one.

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On the Appendages of Tremataspis

Ostracoderms, there is no satisfactory reason for calling,- the mar- ... a pair of jointed, armored appendages attached to the anterior margin of the ventral surface, they must have been attached to ... was nearest the body. The opposite or lateral margin, especially toward its posterior end, is thinned down to a rather sharp edge, ...

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ostracoderm - Meaning in English

ostracoderm. noun. extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic.

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Ostracoderm - definition of ostracoderm by The Free …

Define ostracoderm. ostracoderm synonyms, ostracoderm pronunciation, ostracoderm translation, English dictionary definition of ostracoderm. ... (Palaeontology) any extinct Palaeozoic fishlike jawless vertebrate of the group Ostracodermi, characterized by a heavily armoured body [C19: via New Latin from Greek ostrakon shell + -derm] Collins ...

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ostracoderm photos on Flickr | Flickr

Flickr photos, groups, and tags related to the "ostracoderm" Flickr tag.

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Fishes | OpenStax Biology 2e - Lumen Learning

We should note, however, that the "ostracoderms" represent an assemblage of heavily armored extinct jawless fishes that may not form a natural evolutionary group. Fossils of the genus Haikouichthys from China, with an age of about 530 million years, show many typical vertebrate characteristics including paired eyes, auditory capsules, and ...

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What class do jawless fish belong to

The Agnatha are ectothermic or cold blood, with a cartilage skeleton, and the heart contains 2 rooms. Cover of the body In modern agnates, the body is covered with leather, with stairs or dermic or epidermal. ..., Silurian and Devonian agnates were armored with heavy bone plates. The first armored agnates — the Ostracoderms, precursors of ...

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THE DEGENERATION OF ARMOUR IN ANIMALS

armoured form - Qphiderpeton - with both dorsal and ventral scutes. Chelonians are perhaps the most typically armoured class of Vertebrates at the present time; yet some of the largest and most active forms, such as the leathery turtles {Der moche lys or Sphargis …

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Chapter6

The fine structure of an individual hair consists of three layers: medulla, cortex and cuticular scale (which contain a lot of keratin). (Fig. 6.20). Softer hairs (such as our fine body hairs) lack a medulla, whereas our scalp hair contains a medulla and is usually very strong.

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Classification of Ostracoderms | Vertebrates | Chordata ...

The members of this order were heavily armoured ostracoderms of middle Ordovician to Devonian periods. Body large. Head was flattened and was protected by a bony cephalic shield. The fins were absent. The tail was laterally compressed, covered with small scales, hypocercal. Mouth slit-like aperture.

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Early Vertebrates and Fishes Flashcards | Quizlet

The force exerted on a body moving by a fluid moving in the opposite direction. Heterostracans. A major group of ostracoderms with a heavy bony covering, two laterally placed eyes, and no trace of a nostril but had paired nasal capsules, which water entered through the mouth. They had gill slits in the pharynx, which water passed through ...

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Which Came First—Teeth or Scales? | Answers in Genesis

This design, described in "Bones: God's Living Girders," gives bone the strength to protect internal organs like the brain and to support the body's weight. Enamel is the most heavily mineralized material in your body. The minerals that make enamel hard cover the dentin core of your teeth before they erupt from your gums.

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1911 Encyclopædia Britannica/Ostracoderms - Wikisource ...

OSTRACODERMS or Osteacophores, the earliest and most primitive group of fish-like animals, found as fossils in Upper Silurian and Devonian formations both in Europe and in North America. They are so named (Gr. shell-skins or shell-bearers) in allusion to the nacreous shell-like appearance of the inner face of the plates of armour which cover the more common members of the group.

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Opercular Gill a lid or cover becoming detached at ...

Opercular Gill: a lid or cover becoming detached at maturity by abscission, in eucalyptus for example, a cap covering the bud and formed by fusion or cohesion or perianth parts. Ostracoderm: An early jawless fossil fish of the Cambrian to Devonian periods, having a heavily armoured body. Pectoral Fin: each of a pair of fins situated on either side just behind a fish's head, helping to ...

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THE INTEGUMENT AND ITS DERIVATIVES

Enamel, the hardest substance in the body, covers the tooth surface. It is epidermal in origin. Ganoin is a form of enamel. Dentin is similar to bone in structure but is harder. It is located beneath the enamel and forms the walls of the third component of teeth, the pulp cavity. These are of …

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Metal Clad & Armored Cable | Crescent Electric Supply

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Five hundred million years of extinction and recovery: a ...

Armoured agnathans, including members of several divisions of jawless stem gnathostomes such as heterostracans, osteostracans, galeaspids and thelodonts, are often considered victims of this same event; Long (1993) and McGhee (1996), working from different data, indicated that the youngest armoured agnathans are Frasnian (385–374 Ma) in age ...

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History size chart: Silurian by Dragonthunders on DeviantArt

History size chart: Silurian. Upon the end of the Ordovician and the episodes of suddenly glacial and interglacial cycles around 443 million years ago most of sea life was devastated, many marine biomes lost a great amount of species (trilobites, brachiopods, conodonts, nautiloids, corals etc.) and those that survived started to recover slowly ...

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Placodermi - Susquehanna University

Some taxa had armored plates which articulated directly with the thoracic dermal armor. Bothriolepis(Figure 1) had pectoral fins that were so heavily armored that it looked like a crab. Some of the groups also had pelvic fins, but they not armored, and the pelvic girdle was anchored only in the body wall of the animal.

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Ostracoderms - definition of Ostracoderms by The Free ...

Ostracoderms synonyms, Ostracoderms pronunciation, Ostracoderms translation, English dictionary definition of Ostracoderms. ... (Palaeontology) any extinct Palaeozoic fishlike jawless vertebrate of the group Ostracodermi, characterized by a heavily armoured body [C19: via New Latin from Greek ostrakon shell + -derm] Collins English Dictionary ...

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Muscular Systems of Vertebrates (Biological ... - SILO.PUB

Some of these ancient forms were heavily armored. The skin of cartilaginous fish is flexible and leathery and sometimes bears bristly projections known as placoid scales, remnants of their ancestral heavy body armor. Most cartilaginous fishes are heavy-bodied swift swimmers in …

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Biology 2e, Biological Diversity, Vertebrates, Fishes ...

We should note, however, that the "ostracoderms" represent an assemblage of heavily armored extinct jawless fishes that may not form a natural evolutionary group. Fossils of the genus Haikouichthys from China, with an age of about 530 million years, show many typical vertebrate characteristics including paired eyes, auditory capsules, and ...

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