The oldest record of aquatic amniote congenital scoliosis
نویسندگان
چکیده
We report the first occurrence of congenital scoliosis in an early Permian aquatic parareptile, Stereosternum tumidum from Paraná state, Brazil. The spine malformation is caused by a congenital hemivertebra. These observations give insight into the biomechanical aspects of underwater locomotion in an axial skeleton-compromised aquatic amniote. This is the oldest record of a hemivertebra in an aquatic animal.
منابع مشابه
The oldest parareptile and the early diversification of reptiles.
Amniotes, tetrapods that evolved the cleidoic egg and thus independence from aquatic larval stages, appeared ca 314 Ma during the Coal Age. The rapid diversification of amniotes and other tetrapods over the course of the Late Carboniferous period was recently attributed to the fragmentation of coal-swamp rainforests ca 307 Ma. However, the amniote fossil record during the Carboniferous is relat...
متن کاملمقایسه نتایج کوتاه مدت و بلند مدت فیوژن ستون مهرهها با و بدون وسیلهگذاری خلفی در درمان اسکولیوز مادرزادی
Background: Congenital scoliosis is a developmental disorder defined as a lateral curvature of the spine. Its progressive trend and complications, such as cosmetic problems, pain and pulmonary symptoms, have put scoliosis as an important skeletal deformity that should be corrected. One of the currently accepted methods of treatment is posterior spinal fusion (PSF) that may be performed with or ...
متن کاملAn Early Captorhinid Reptile (amniota, Eureptilia) from the Upper Carboniferous of Hamilton, Kansas
A new eureptile, Concordia cunninghami, gen. et sp. nov., is described from the Upper Pennsylvanian Hamilton-Fossillagerstätte, Kansas, U.S.A. The new taxon is currently known on the basis of two well-preserved skulls. A phylogenetic analysis groups Concordia consistently with captorhinids; the holotype, therefore, can be regarded as the oldest record of a captorhinid reptile, and the first one...
متن کاملBiodiversity of aquatic macrobenthoses and the first record of the Horsetail worms (Nematomorpha: Gordiidae) in Marbor River - Isfahan Province
In an investigation of the effects of the effluent of fish farms on the water quality of the Marbor River in Isfahan province based on biological indicators, some cases of infection of macrobenthos with horsehair worms (Nematomorpha: Gordiidae) were observed. About 76% of the observed worms were observed to leave their hosts. the horsehair worms were identified in only three families of aquatic...
متن کاملEtiology of Congenital Scoliosis
Congenital scoliosis is an abnormal lateral curvature of the spine, resulting from disruption of normal vertebral development. Although there are many types of defects observed in congenital scoliosis, all result from abnormal formation and segmentation of the vertebral precursors, called somites. Developmental studies in animal models have identified many genes regulating somite formation and ...
متن کامل