Chirotheres

Author : Hendrik Klein,Andrew B. Heckert
Publisher : Indiana University Press
Page : 550 pages
File Size : 54,9 Mb
Release : 2023-07-25
Category : Science
ISBN : 9780253066046

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Chirotheres by Hendrik Klein,Andrew B. Heckert Pdf

Comprehensive in detail and worldwide in scope, Chirotheres is the definitive compendium of what is known about the five-toed footprints of Triassic archosaurs, ancestors of the crocodiles. Sandstone slabs with extensive trackways have been known for almost two centuries and are highlights in museum exhibits around the globe. These trackways provide direct insight into the locomotion and behavior of the fascinating reptiles that made these tracks, and, together with known skeletons, they allow a richer reconstruction of chirothere lifestyle than is possible from bones alone. Written by expert researchers in the fields of vertebrate ichnology, vertebrate paleontology, and scientific illustration, Chirotheres explores the various facets of chirothere research including the history of their study, footprint formation and preservation, the bone record, the environment and lifestyle of chirotheres, and finally, their disappearance at the end of the Triassic. Chirotheres also features a global compendium of track collections with chirothere material, including specimen numbers, detailed phylogenetic definitions of track makers, and extensive measurements from key chirothere tracks and trackways. It represents an invaluable resource of anyone interested in these ancient animals.

Author : Holly N. Woodward,James O. Farlow
Publisher : Indiana University Press
Page : 693 pages
File Size : 40,5 Mb
Release : 2023-09-05
Category : Science
ISBN : 9780253066473

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Ruling Reptiles by Holly N. Woodward,James O. Farlow Pdf

Modern crocodylians—crocodiles, alligators, caiman (Central and South America), and gharials (India)—have evolved over 250 million years from a fully terrestrial, bipedal ancestor. Along with birds, crocodylians are the only living members of Archosauria, the group including nonavian dinosaurs. Ruling Reptiles features contributions on a broad range of topics surrounding crocodylian evolution and biology including osteology, osteohistology, developmental biology, myology, odontology, functional morphology, allometry, body size estimation, taphonomy, parasitology, ecology, thermophysiology, and ichnology. It demonstrates how the wide variety of these studies can also provide crucial insights into dinosaurian biology and evolution. Featuring the latest findings and interpretations, Ruling Reptiles: Crocodylian Biology and Archosaur Paleobiology is an essential resource for zoologists, biologists, and paleontologists.

Author : Hendrik Klein,Andrew B. Heckert
Publisher : Indiana University Press
Page : 351 pages
File Size : 40,5 Mb
Release : 2023-07-25
Category : Nature
ISBN : 9780253066039

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Chirotheres by Hendrik Klein,Andrew B. Heckert Pdf

Comprehensive in detail and worldwide in scope, Chirotheres is the definitive compendium of what is known about the five-toed footprints of Triassic archosaurs, ancestors of the crocodiles. Sandstone slabs with extensive trackways have been known for almost two centuries and are highlights in museum exhibits around the globe. These trackways provide direct insight into the locomotion and behavior of the fascinating reptiles that made these tracks, and, together with known skeletons, they allow a richer reconstruction of chirothere lifestyle than is possible from bones alone. Written by expert researchers in the fields of vertebrate ichnology, vertebrate paleontology, and scientific illustration, Chirotheres explores the various facets of chirothere research including the history of their study, footprint formation and preservation, the bone record, the environment and lifestyle of chirotheres, and finally, their disappearance at the end of the Triassic. Chirotheres also features a global compendium of track collections with chirothere material, including specimen numbers, detailed phylogenetic definitions of track makers, and extensive measurements from key chirothere tracks and trackways. It represents an invaluable resource of anyone interested in these ancient animals.

Author : Geological Society of America
Publisher : Unknown
Page : 406 pages
File Size : 40,8 Mb
Release : 1955
Category : Geology
ISBN : MINN:31951P00716619L

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Bulletin of the Geological Society of America by Geological Society of America Pdf

Author : Frank Elmer Peabody
Publisher : Unknown
Page : 458 pages
File Size : 44,5 Mb
Release : 1947
Category : Electronic
ISBN : UCAL:B3762400

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Collected papers by Frank Elmer Peabody Pdf

Author : Anonim
Publisher : Unknown
Page : 560 pages
File Size : 43,7 Mb
Release : 1993
Category : Geology, Stratigraphic
ISBN : UCBK:C106386104

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The Nonmarine Triassic by Anonim Pdf

Author : Richard Granville Bromley
Publisher : Unknown
Page : 408 pages
File Size : 54,5 Mb
Release : 2007
Category : Nature
ISBN : UCSD:31822033860024

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Sediment-organism Interactions by Richard Granville Bromley Pdf

Author : Anonim
Publisher : Unknown
Page : 888 pages
File Size : 47,6 Mb
Release : 1968
Category : Geology
ISBN : UCSD:31822009555731

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The Liverpool and Manchester Geological Journal by Anonim Pdf

Author : New Mexico Geological Society. Field Conference
Publisher : Unknown
Page : 376 pages
File Size : 47,7 Mb
Release : 1987
Category : Geology
ISBN : STANFORD:36105033027314

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Northeastern New Mexico by New Mexico Geological Society. Field Conference Pdf

Author : Peter Edward Wolfe
Publisher : Unknown
Page : 376 pages
File Size : 44,6 Mb
Release : 1977
Category : Science
ISBN : STANFORD:36105031829265

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The Geology and Landscapes of New Jersey by Peter Edward Wolfe Pdf

Author : Walther Huebner
Publisher : Unknown
Page : 432 pages
File Size : 55,9 Mb
Release : 1939
Category : English language
ISBN : COLUMBIA:CU61215465

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Geology and Allied Sciences by Walther Huebner Pdf

Author : Louis L. Jacobs
Publisher : Unknown
Page : 440 pages
File Size : 51,8 Mb
Release : 1980
Category : Paleontologists
ISBN : UCAL:B4151980

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Aspects of Vertebrate History by Louis L. Jacobs Pdf

Author : Harvard University. Museum of Comparative Zoology
Publisher : Unknown
Page : 648 pages
File Size : 54,5 Mb
Release : 1953
Category : Zoology
ISBN : OSU:32435027448067

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Bulletin of the Museum of Comparative Zoology by Harvard University. Museum of Comparative Zoology Pdf

Author : Charles A. Ross
Publisher : Unknown
Page : 476 pages
File Size : 41,8 Mb
Release : 1976
Category : Paleobiogeography
ISBN : UCSD:31822011987484

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Paleobiogeography by Charles A. Ross Pdf

Author : Charles Marcus Breder,Priscilla Rasquin
Publisher : Unknown
Page : 670 pages
File Size : 54,8 Mb
Release : 1952
Category : Developmental biology
ISBN : IND:30000112750389

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The Sloughing of the Melanic Area of the Dorsal Fin, an Ontogenetic Process in Tylosurus Raphidoma by Charles Marcus Breder,Priscilla Rasquin Pdf

"Small juvenile Tylosurus raphidoma (Ranzani) concomitantly develop elongation of the posterior rays of the dorsal fins and mandibular lappets. Both structures are areas of intense melanin concentration. 2. Larger juveniles and sexually mature adults lack both these features, having no mandibular lappets and possessing a dorsal fin which is high anteriorly and low posteriorly, and shows no concentration of melanophores at any place. 3. The metamorphosis from one form into the other is evidently rapid, for individuals in the state of transformation are not nearly so common as those above and below the size at which it occurs. 4. This transformation takes place when the fish are 200 mm. and 300 mm. in standard length and long before sexual maturity is attained which at the earliest is not under 600 mm.; therefore it is evidently not under the control of endocrine changes which take place at the attainment of sexual maturity. 5. The transformation takes place at an age of approximately six months, and sexual maturity is not attained until a year has passed. 6. Individuals in the transitional stage may be found in the summer and fall, most of the spawning evidently taking place in the first half of the year. 7. The black areas of the dorsal are reduced not by resorption but by a process of sloughing off. The melanophores break down first, the fin membranes then disintegrate, and finally the fin rays snap off at their articulations. 8. Before the destructive changes take place, the final form of the fin is foreshadowed by the shape of the melanic area of the juvenile fin. 9. A change in behavior takes place before the process of sloughing off occurs, the young juveniles associating with floating twigs or stems about their own size and general color. After they stop this association, the changes described take place, and from then on they avoid such objects and live freely in open water. 10. Histological examination of the mandibular lappets of Tylosurus and the barbels of Cypselurus showed that these structures are eliminated by a process of resorption. 11. The presence of large numbers of coarse granular eosinophiles in all these involuting structures may be associated either with parasitism or with the resorption process. 12. No taste buds were found to be present in either the belonid lappets or the exocoetid barbels which are evidently homologous, a condition apparently unique among teleost oral appendages"--P. 21.