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Stethacanthus is an extinct genus of shark-like cartilaginous fish which lived from the Late Devonian to Late Carboniferous epoch, dying out around 298.9 million years ago. Fossils have been found in Australia , Asia , Europe and North America .
Stethacanthus altonensis is the type species of the family Stethacanthidae, therefore, all stethacanthids meet certain morphological characters best represented in this species. Stethacanthids are medium-sized cladodont shark-like holocephalians with a short rostrum , broad supraorbital region, and short otic region.
Native plants have evolved in balance with the rest of the ecosystem. Local pollinators and wildlife rely on native species, and are just as threatened by invasive, non-local plants as the natives ...
Approximately 0.068% of all evaluated plant species are listed as extinct in the wild. The IUCN also lists one plant subspecies as extinct in the wild. This is a complete list of extinct in the wild plant species and subspecies as evaluated by the IUCN. All are vascular plants (tracheophytes).
Swathes of plants and animals have been consumed by evolution, shifting climates or the often-damaging expansion of humankind. Science has brought back the scent of a long-dead flower Skip to main ...
As of September 2016, the International Union for Conservation of Nature (IUCN) lists 116 extinct species, 132 possibly extinct species, 35 extinct in the wild species, 13 possibly extinct in the wild species, five extinct subspecies, one extinct in the wild subspecies, and four extinct varieties of plant.
The Saint Helena Olive is one of a number of plant species to have gone extinct on Saint Helena since the arrival of the Portuguese in 1502, including Trochetiopsis melanoxylon, Acalypha rubrinervis, Wahlenbergia roxburghii, and Heliotropium pannifolium, with Lachanodes arborea and Trochetiopsis erythroxylon also extinct in the wild. [5]
Cladoselache is an extinct genus of shark-like chondrichthyan (cartilaginous fish) from the Late Devonian of North America. It was similar in body shape to modern lamnid sharks (such as mako sharks and the great white shark ), but was not closely related to lamnids or to any other modern ( selachian ) shark.