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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 .
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).
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.
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.
Akmonistion is an extinct genus of cartilaginous fish that lived in the Early Carboniferous. The genus contains a single species, A. zangerli , discovered by Stan Wood in 1982. [ 1 ] It is distinguished by an unusual enlarged formation of the dorsal fin, called a "spine-brush complex", of unknown function.
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A. Abies milleri; Acer alaskense; Acer ashwilli; Acer beckianum; Acer browni; Acer cascadense; Acer castorrivularis; Acer chaneyi; Acer clarnoense; Acer dettermani
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]