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ZooCVABioIII.2013.Abante
ZooCVABioIII.2013.Abante
Mariel Marjes
Introduction Ostracoderms (shell-skinned) are of several groups of extinct, primitive, jawless fishes that were covered in an armour of bony plates. They appeared in the Cambrian, about 510 million years ago, and became extinct towards the end of the Devonian, about 377 million years ago. They were quite abundant during the upper Silurian and Devonian periods. Most of fossils of Ostracodermi were preserved in the bottom sediments of freshwater streams. However, the opinion is sharply divided as to whether their habitat was freshwater or marine. The first fossil fishes that were discovered were ostracoderms. The Swiss anatomist Louis Agassiz received some fossils of bony armored fish from Scotland in the 1830s. The ostracoderms resembled the present day cyclostomes (lampreys and hagfishes) in many respects and together with them constitute a special group of jawless vertebrates, the Agnatha. Characteristics: They use gills exclusively for respiration but not for feeding . Earlier chordates with gills used them for both respiration and feeding. Ostracoderms had separate pharyngeal gill pouches along the side of the head, which were permanently open with no protective operculum. mostly small to medium-sized fishes, protected by a heavy, bony dermal (derived from skin) armor. bottom-dwellers; filter-feeders or grazers. no paired fins, but many with stabilizing paired flaps on either side of head. (1) Ostracoderms were the first vertebrates. (2) They were popularly called armoured fishes. (4) They lived in freshwater. (5) They were bottom dwellers. (6) Their body was fish-like and did not exceed 30 cm in size. (7) Paired fins were absent. (8) Median and caudal fins were present. (9) The caudal fin was of heterocercal type. (10) The head and thorax were covered by heavy armour of bones. It protected ostracoderms from the giant scorpion like arthropods, eurypterids. (11) Bony skull was well developed. (12) Mouth was mostly present on the ventral side. (13) They were having large number of gill slits. (14) The nervous system had 10 pairs of cranial nerves. (15) The head had a pair of lateral eyes, and a median pineal eye. (16) They were filter feeders, feeding like a vacuum cleaner. (17) The endoskeleton was either bony or cartilaginous.
Origin and evolution of ostracoderms
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Introduction Gnathostomata are the jawed vertebrates. (gnathos= "jaw" + (stoma)="mouth". It comprises roughly 60,000 species. (99% of all living vertebrates). Living gnathostomes have teeth, and paired appendages. A horizontal semicircular canal is present in the inner ear. Myelin sheaths is present on the neurons. Adaptive immune system uses V(D) J recombination ( it is the mechanism of somatic recombination that occurs only in developing lymphocytes during the early stages of T and B cell maturation. VDJ recombination is the process by which T cells and B cells randomly assemble different gene segments – known as variable (V), diversity (D) and joining (J) genes – in order to generate unique receptors (known as antigen receptors) that can collectively recognize many different types of molecule. While Agnatha (petromyzon and hagfish) use genetic recombination in the variable lymphocyte receptor gene. It is now assumed that Gnathostomata evolved from ancestors that already possessed a pair of both pectoral and pelvic fins. In addition to this, some placoderms were shown to have a third pair of paired appendages, that had been modified to claspers in males and basal plates in females—a pattern not seen in any other vertebrate group. It is believed that the jaws evolved from anterior gill support arches that had acquired a new role, being modified to pump water over the gills by opening and closing the mouth more effectively – the buccal pump mechanism. Presence of Calcified, bony skull and vertebra are the characteristic features of Gnathostomata (fishes, amphibians, reptiles, birds and mammals). Pelvic fins are situated just in front of the anus. Interventrals and basiventrals present in the backbone. These are the elements of the backbone which lie under the notochord, and match the basidorsals and interdorsals respectively. Gill arches which lie internally to the gills and branchial blood vessels, contrary to the gill arches of all jawless craniates, which are external to the gills and blood vessels. A horizontal semicircular canal in the inner ear. Paired nasal sacs which are independent from the hypophysial tube. There are numerous other characteristics of the soft anatomy and physiology (e.g. myelinated nerve fibres, sperms passing through urinary ducts, etc.), which are unique to the gnathostomes among extant craniates, but cannot by observed in fossils.
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Introduction Ostracoderms (shell-skinned) are of several groups of extinct, primitive, jawless fishes that were covered in an armour of bony plates. They appeared in the Cambrian, about 510 million years ago, and became extinct towards the end of the Devonian, about 377 million years ago. They were quite abundant during the upper Silurian and Devonian periods. Most of fossils of Ostracodermi were preserved in the bottom sediments of freshwater streams. However, the opinion is sharply divided as to whether their habitat was freshwater or marine. The first fossil fishes that were discovered were ostracoderms. The Swiss anatomist Louis Agassiz received some fossils of bony armored fish from Scotland in the 1830s. The ostracoderms resembled the present day cyclostomes (lampreys and hagfishes) in many respects and together with them constitute a special group of jawless vertebrates, the Agnatha. Characteristics: They use gills exclusively for respiration but not for feeding . Earlier chordates with gills used them for both respiration and feeding. Ostracoderms had separate pharyngeal gill pouches along the side of the head, which were permanently open with no protective operculum. mostly small to medium-sized fishes, protected by a heavy, bony dermal (derived from skin) armor. bottom-dwellers; filter-feeders or grazers. no paired fins, but many with stabilizing paired flaps on either side of head. (1) Ostracoderms were the first vertebrates. (2) They were popularly called armoured fishes. (4) They lived in freshwater. (5) They were bottom dwellers. (6) Their body was fish-like and did not exceed 30 cm in size. (7) Paired fins were absent. (8) Median and caudal fins were present. (9) The caudal fin was of heterocercal type. (10) The head and thorax were covered by heavy armour of bones. It protected ostracoderms from the giant scorpion like arthropods, eurypterids. (11) Bony skull was well developed. (12) Mouth was mostly present on the ventral side. (13) They were having large number of gill slits. (14) The nervous system had 10 pairs of cranial nerves. (15) The head had a pair of lateral eyes, and a median pineal eye. (16) They were filter feeders, feeding like a vacuum cleaner. (17) The endoskeleton was either bony or cartilaginous.
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La ley de charles2 Trabajo de Elena Arana
Tema 3. elementos_quimicos
Tema 3. elementos_quimicos
Normas alimentacion equilibrada
Normas alimentacion equilibrada
01 presentacion si_prefijos
01 presentacion si_prefijos
01 presentacion si_magnitudes_unidades
01 presentacion si_magnitudes_unidades
metodo_cientifico
metodo_cientifico
calibrador_pie_rey
calibrador_pie_rey
Reino Plantas 1 ESO
Reino Plantas 1 ESO
Fotos concurso fotografia medioambiente 2018
Fotos concurso fotografia medioambiente 2018
Trabajo de Ramón y Cajal de Alvaro Cris Pedro y Edu
Trabajo de Ramón y Cajal de Alvaro Cris Pedro y Edu
Trabajo sobre Ramón y Cajal de Javi y Aroa
Trabajo sobre Ramón y Cajal de Javi y Aroa
Trabajo sobre Ramón y Cajas de Andrea, Vicente y Pilar
Trabajo sobre Ramón y Cajas de Andrea, Vicente y Pilar
Actividades de ajuste de reacciones quimicas resueltas
Actividades de ajuste de reacciones quimicas resueltas
presentacion calcu_masa ecuaciones quimicas
presentacion calcu_masa ecuaciones quimicas
Clasificación de los seres vivos Oxford
Clasificación de los seres vivos Oxford
Sistema nervioso y endocrino
Sistema nervioso y endocrino
los seres vivos
los seres vivos
Tema Enlace Químico y sus propiedades
Tema Enlace Químico y sus propiedades
Biodiversity Vertebratesvs Invertebrates
1.
Biodiversity Vertebrates vs.
Invertebrates
2.
Vertebrates
3.
4.
5.
6.
Invertebrates
7.
8.
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