Fossil taxa described in 1986

Baryonyx () is a genus of theropod dinosaur which lived in the Barremian stage of the Early Cretaceous period, about 130–125 million years ago. The first skeleton was discovered in 1983 in the Smokejack Clay Pit, of Surrey, England, in sediments of the Weald Clay Formation, and became the holotype specimen of Baryonyx walkeri, named by palaeontologists Alan J. Charig and Angela C. Milner in 1986. The genus name Baryonyx comes from Ancient Greek βαρύς (barús), meaning "heavy" or "strong", and ὄνυξ (ónux), meaning "claw", alluding to the animal's very large claw on the first finger; the specific

Megazostrodon is an extinct genus of basal mammaliaforms belonging to the order Morganucodonta. It is approximately 200 million years old. Two species are known: M. rudnerae from the Early Jurassic of Lesotho and South Africa, and M. chenali from the Late Triassic of France.

Avaceratops is a genus of small herbivorous ceratopsian dinosaurs which lived during the late Campanian in what are now the Northwest United States. Most fossils come from the Judith River Formation.

Conchoraptor (meaning "conch plunderer") is a genus of oviraptorid dinosaurs that lived in Asia during the Late Cretaceous epoch, about 70 million years ago. It is known from the Barun Goyot and possibly the Nemegt formation of Mongolia.

Xenotarsosaurus is a genus of abelisaurid theropod dinosaur that lived during the Late Cretaceous of Argentina.

Afropithecus is a genus of Miocene hominoid with the sole species Afropithecus turkanensis, it was excavated from a small site near Lake Turkana called Kalodirr in northern Kenya in 1986 and named by Richard Leakey and Meave Leakey. The estimated age of Afropithecus is between 16 and 18 million years old, which was determined with radiometric dating techniques and the geological studies conducted by Broschetto and Brown from the University of Utah. In total there are 46 recovered specimens from Kalodirr relating to Afropithecus consisting of cranial, mandible, dentition and post-cranial remain

Lapparentosaurus is a genus of sauropod dinosaur from the Middle Jurassic. Its fossils were found in Madagascar (Isalo III Formation). It contains one species, Lapparentosaurus madagascariensis. The genus and species were named by José Bonaparte in 1986. The classification of Lapparentosaurus is controversial, as it exhibits a combination of characteristics of basal sauropods and titanosauriforms.

Sacabambaspis is an extinct genus of armored jawless fish which lived in the Ordovician period. Sacabambaspis inhabited shallow waters on the continental margins of the southern supercontinent Gondwana. The most complete specimens have been found in Bolivia, while armor fragments are also known from Argentina, Australia, and Oman. Sacabambaspis vaguely resembles a slender tadpole, with an oversized armor-plated head, flat body, and no discernible fins outside of its narrow tail. The eyes are closely spaced and positioned at the very front of the head, akin to car headlamps. It was about long i

Tuarangisaurus ( "ancient" + "lizard") is an extinct genus of elasmosaurid known from New Zealand. The type and only known species is Tuarangisaurus keyesi, named by "Pont" Wiffen, Joan Wiffen and Bill Moisley in 1986. The specific name honours Ian W. Keyes of the New Zealand Geological Survey.

Numidotherium (from Numidia, and Ancient Greek θηρίον (thēríon), meaning "beast") is an extinct genus of early proboscideans, discovered in 1984, that lived during the middle Eocene of North Africa some 46 million years ago. It was about tall at the shoulder and weighed about .

Remingtonocetus is an extinct genus of early cetacean freshwater aquatic mammals of the family Remingtonocetidae endemic to the coastline of the ancient Tethys Ocean during the Eocene. It was named after naturalist Remington Kellogg.

Nyanzapithecus is an extinct genus of primate from the Middle Miocene of Maboko Island, Nyanza Province, Kenya. This genus is known from four species. It had an average body mass of around .

Hulitherium tomasetti (meaning "Huli beast", after the Huli people) is an extinct zygomaturine marsupial that lived in New Guinea during the Pleistocene. The species name honours Berard Tomasetti, a Catholic priest in Papua New Guinea, who brought the fossils to the attention of experts.

Ianthasaurus is an extinct genus of small edaphosaurids from the Late Carboniferous.

Sinomastodon ("Chinese mastodont") is an extinct gomphothere proboscidean known from the Late Miocene to Early Pleistocene of Asia, including China, Japan, Thailand, Myanmar, Indonesia and probably Kashmir.

Ferugliotherium is a genus of fossil mammals in the family Ferugliotheriidae from the Campanian and/or Maastrichtian period (Late Cretaceous; around 70 million years ago) of Argentina. It contains a single species, Ferugliotherium windhauseni, which was first described in 1986. Although originally interpreted on the basis of a single brachydont (low-crowned) molar as a member of Multituberculata, an extinct group of small, rodent-like mammals, it was recognized as related to the hypsodont (high-crowned) Sudamericidae following the discovery of additional material in the early 1990s. After a ja

Axelrodichthys is an extinct genus of mawsoniid coelacanth from the Cretaceous of Africa, North and South America, and Europe. Several species are known, the remains of which were discovered in the Lower Cretaceous (Aptian-Albian) of Brazil, North Africa, and possibly Mexico, as well as in the Upper Cretaceous of Morocco (Cenomanian), Madagascar (Coniacian –Santonian) and France (Lower Campanian to Lower Maastrichtian). The Axelrodichthys of the Lower Cretaceous frequented both brackish and coastal marine waters (lagoon-coastal environment) while the most recent species lived exclusively in fr

Collidosuchus is an extinct genus of archegosauroidean temnospondyl within the family Archegosauridae. It lived during the Permian period, approximately 268 to 265 million years ago in what is now Russia.

Eurolimnornis is a dubious genus of avemetatarsalian, probably a pterosaur, from the Early Cretaceous.

Behemotops (from the Biblical monster Behemoth, by Linnaeus and others believed to be a hippo) is an extinct genus of herbivorous marine mammal. It lived from the Early Oligocene (Rupelian) through the Late Oligocene (33.9 mya—23 Mya), existing for approximately . It is the most primitive known desmostylian, believed to be close to the ancestry of all other desmostylians.

Vincelestes ("Vince's thief") is an extinct genus of mammal that lived in what is now South America during the Early Cretaceous. It is closely related to modern therian mammals as part of Cladotheria.

Yunnanodon ("Yunnan tooth", from China's Yunnan province where it was discovered, and the Greek odon (ὀδών) meaning "tooth") is an extinct genus of tritylodontid mammaliamorphs that lived in China during the Sinemurian stage of the Early Jurassic period. Its specific name brevirostre is Latin for "short-beaked" (brevis ("short") + rostrum ("beak")).

Aztlanolagus is an extinct monotypic genus of rabbit that lived during the Quaternary in what is now the Southern to Southwestern United States and northern Mexico. Aztlanolagus agilis is currently the only recognized species, though differences among recovered fossils suggest that there may have been other species. The generic name refers to Aztlán, the legendary place of origin of the Nahua peoples as recorded in the mythological accounts of the Aztecs and other Nahua groups. By some traditions, this legendary locale is placed in the border regions of the Southwestern United States and adjac

Palaeocursornis is a dubious genus of avemetatarsalian, probably an azhdarchoid pterosaur.

Xinjiangchelys is an extinct genus of xinjiangchelyid turtle known from the Middle Jurassic to Early Cretaceous of China and Kyrgyzstan. It is known from over 11 different species.

Theroteinus is an extinct genus of haramiyidan mammaliaforms from the Late Triassic of France and Britain. It contains three species: T. nikolai, T. rosieriensis and T. jenkinsi, the former two of which are known exclusively from teeth found at the sand quarry of Saint-Nicolas-de-Port, while T. jenkinsi is known from a bedded sequence belonging to the Westbury Formation in a road cutting near Holwell, Dorset. Theroteinus is the only member of the family Theroteinidae and the suborder Theroteinida.

Groebertherium is a genus of dryolestoid mammal from the Late Cretaceous Los Alamitos and Allen Formations of Argentina. It is not closely related to other contemporary dryolestoids, all of which are part of the clade Meridiolestida.

Nambaroo is an extinct genus of macropod marsupial from the late Oligocene to the early Miocene of Australia.

Nanantius is a genus of extinct enantiornithean avialan ("bird" in the broad sense of the word) known from the Early Cretaceous (Albian, c. 100–112 mya) of Australia.

Gondwanatherium is a genus of stem-mammal from the extinct suborder Gondwanatheria that lived in Patagonia, South America during the "Age of Dinosaurs", specifically during the Late Cretaceous (Campanian to Maastrichtian epochs).

Austrotriconodon is a mammal genus from the Campanian and Maastrichtian of South America. It currently contains only the type species, A. mckennai. Originally assumed to be a eutriconodont, more recent studies have recovered it as a meridiolestidan dryolestoid.

Prohesperocyon ("before Hesperocyon") is an extinct genus of canid, endemic to North America appearing during the Late Eocene around 36.6 mya (AEO).

Dinnebitodon is an extinct genus of tritylodontid mammaliamorphs from the Early Jurassic. It has only been found in the Kayenta Formation in northeastern Arizona. It closely resembles the related genus Kayentatherium from the same formation. It is set apart by differences in the dentition, while resembling in most other respects.