Taxon Index: D-K
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- Dacentrurus X : a basal Late Jurassic European stegosaurid, the first stegosaur ever described (1875).
- Dactylosaurus X : a strange and poorly known pachypleurosaur.
- Dallia: the Alaskan blackfish
- Damocles X: a stethacanthid-type shark with a particularly elaborate head-dress.
- Dasyuromorphia: the infamous Tasmanian Devil and other carnivorous marsupials.
- Dendrerpeton X: a basal temnospondyl from the Carboniferous.
- Dermoptera: colugos or "flying lemurs." A small order of Southeast Asian mammals.
- Desmatosuchus X : a Late Triassic aetosaur
- Deuterosaurus X : a Late Permian anteosaur from Russia.
- Diabolepis X : a rather famous Early Devonian sarcopterygian fish, related to lungfishes.
- Diadectomorpha X : possibly the sister group to amniotes.
- Diapsida: roughly, everything with two temporal fenestrae.
- Dianzhongia X : an Early Jurassic cynodont
- Dichobunidae X: Diacodexis and the most basal artiodactyls
- Dicraeosauridae X: small Gondwanan diplodocines with elongated spines
- Dicynodontia X: : a large group of advanced, mostly Triassic therapsids with weird jaws.
- Didelphimorphia: possums and related South American marsupials.
- Didolodontidae X: litopterns and more basal South American ungulates
- Didolodus X: the sister? aunt? of the litopterns, from the Late Eocene of Argentina.
- Diictodontia X: a group of Permo-Triassic dicynodonts including the well-known Cistecephalus
- Dimetrodon X: the old sail-back himself
- Dimorphodontidae X: a group of pterosaurs including the controversial Sordes
- Dinilysia X: an impotant transitional Late Cretaceous snake from South America
- Dinocephalia X: medium to large, big-bodied, short-legged "dog-faced" Permian therapsids
- Dinocerata X: the famous rhino-like uintatheres and cousins
- Dinornithiformes X: the moas of New Zealand
- Dinosauria: dinosaurs and birds
- Dinosauriformes: protodinosaurs from the Middle Triassic of South America
- Dinosauromorpha: same as Dinosauriformes, with the addition of Lagerpeton.
- Diplocercides X: atypical actinistians from the Late Devonian of Europe
- Diplodocidae X: Apatosaurus + Diplodocus
- Diplodocinae X: extremely long-necked saropods from the Jurassic of Africa and North America
- Diplodocomorpha X: Diplodocus > Saltasaurus, i.e., the diplodocid side of the neosauropods.
- Diplodocoidea X: Diplodocus + Dicraeosaurus
- Diplodocus X: ask any 6-year-old what this one is
- Diplovertebron X: an embolomere "amphibian" from the Late Carboniferous of Europe and North America
- Dipnoi: lungfishes and relatives
- Dipnomorpha: lungfishes > tetrapods.
- Diprotodontia: kangaroos, potoos, wombats, koalas, etc.
- Discosauriscus X: seymouriamorph anamniote tetrapods from the Late Permian of Europe & China
- Dissorophoidea X: basal temnospondyls -- possibly the parent of some or all living amphibians
- Docodonta X: mouse-sized protomammals with long muzzles from the Late Mesozoic of Europe and the Americas.
- Docodontidae X
- Doliosauriscus X
- Dorudon X
- Doswellia X
- Draconinae
- Drepanaspis X
- Dromaeosauridae X
- Dromasauria X
- Dromornithiformes X
- Dryolestoidea X
- Dryosauridae X:
- Dsungaripteroidea X
- Dvinia X
- Dvinosauria X:
- Dyrosauridae X
-E-
- Echinodon X
- Edaphosauridae X: Permo-Carboniferous sail-back vegetarian synapsids
- Edaphosaurus X: an edaphosaurid with particularly elaborate spines
- Edopoidea X: basal temnospondyls with a rather terrestrial look
- Edops X: a well-known member of the preceding family
- Efraasia X
- Elapidae: venomous, often marine snakes with hollow, relatively immobile maxillary fangs
- Elasmobranchii: the Mesozoic sharks -- fusiform shape, cladodont teeth with three enameloid layers
- Elasmosauridae X: longest, largest and last of the plesiosaurs
- Elginerpeton X: a Frasnian near-tetrapod from Scotland
- Elginerpetonidae X: near-tetrapods from the Frasnian of Europe
- Elliotsmithia X: perhaps the last of the "pelycosaurs"
- Elopocephala: all teleosts except the osteoglossomorphs
- Elopomorpha: all fishes with a leptocephalus larva.
- Elpistostegalia: a group of Middle and Late Devonian Osteolepiforms, including the famous Panderichthys.
- Elpistostege X: a close relative of Panderichthys
- Emausaurus X: either an early stegosaur, a " miniature version of Huayangosaurus" or a stem thyreophoran from the Early Jurassic of Europe
- Embolomeri X: Specialized, long-bodied, piscivorous anthracosaurs from the Carboniferous of Europe and North America
- Enantiornithes X: the "opposite birds" of the Cretaceous.
- Endeiolepis X: a Late Devonian anaspid? or lamprey?
- Entelodontoidea: X: everyone's favorite terror-pig
- Eocecilia X: the earliest known caecilian, from the Jurassic of Arizona.
- Eogyrinidae X: a small family of Permo-Carboniferous embolomeres
- Eoherpeton X: an early Carboniferous Scottish anthracosauroid (probably).
- Eothyrididae X: small, rather primitive group of "pelycosaurs" from the Early Permian of North America
- Eotitanosuchia X: very big, basal therapsids from the Middle and Late Permian of Russia.
- Eotyrannus X: the most primitive known tyrannosauroid, from the Early Cretaceous of Europe (Isle of Wight)
- Epachtosaurus X: one of very late-surviving South American titanosaurs
- Eparctocyona: cows > horses. Probably includes ruminants, whales and South American ungulates.
- Epicynodontia: Galesaurus + Galileo? All mammals and all cynodonts except the most primitive.
- Epitheria: all but the most primitive therian mammals.
- Eretmosaurus X: a very basal plesiosauroid from the Late Triassic
- Erinaceinae: hedgehogs
- Erinaceomorpha: hedgehogs > shrews
- Erpetosuchus X:
- Eryopoidea X: the famous Permian temnospondyl Eryops
- Erythrosuchidae X: early archosauromorphs, the largest terrestrial vertebrates of the Early Triassic
- Esocidae: the pikes and extinct relatives
- Esociformes: pikes and mudminnows
- Esox: pikes, pickerel & muskellunge
- Estemmenosuchidae X:
- Estemmenosuchus X
- Estesesox X
- Euantiarcha X
- Euconodonta X
- Eucritta X
- Eucynodontia
- Eugaleaspidiformes X
- Eugeneodontida X
- Eugnathostomata
- Euhelopodidae X
- Euichthyosauria X:
- Euparkeriidae X
- Eupelycosauria
- Euphytosauria X
- Eupleurodira
- Euporosteus X
- Eureptilia
- Eurhinosauria X:
- Eurycleidus X: an interesting Early Jurassic pliosaur from Europe
- Eurypoda X: Stegosaurus + Ankylosaurus, the crown group of armored dinosaurs
- Eurypterygii: the main group of neoteleost fishes
- Eusauropoda X: essentially all of the sauropods from the Middle Jurassic and later
- Eusauropterygia X: all nothosaurs, plesiosaurs and Simosaurus
- Euscolosuchus X:
- Euselachii: a vague group, probably Hybodontiformes + living sharks
- Euskelia X: a large group of mostly big, terrestrial-looking basal temnospondyls
- Eusthenopteron X
- Euteleostei: a big, somewhat indefinite group of teleost fishes: Ostariophysi + Neoteleostei?
- Eutherapsida: dinocephalians + anomodonts + theriodonts
- Eutheria: people > possums
- Eutheriodontia: the theriodonts and cynodonts
-F-
- Fabrosauridae X: a probably paraphyletic group of basal ornithischian dinosaurs
- Falcatidae X: one of the paleoshark groups with a fancy head-dress, probably ancestral to the holocephalians (chimeras etc.)
- Falconiformes: hawks, eagles & Old World Vultures
- Ferae: cats, dogs & seals
- Fritillaridae: a very basic family of tunicates
- Furcacaudiformes X: jawless fishes who looked like goldfish
-G-
- Galeaspida X: a large & long-lived group of armored jawless fishes with a large dorsal opening in the headshield
- Galeomorphii: most modern sharks
- Galesauridae X:
- Galesaurus X
- Galliformes: Gallus (chicken), geese, turkey.
- Gallinuloididae X: an Eocene to Miocene family of basal chickens
- Galloanserae: chickens + ducks
- Gavialidae: modern crocs with a very slender snout and very small nasal bones
- Gaviiformes: loons
- Gekkota: gekkos
- Genasauria X: Stegosaurus + Triceratops.
- Georgiacetus X: a well known Middle Eocene protocetid (early whale) from Georgia
- Gephyrostegidae X: a family of rather lizard-like anthracosaurs from the Late Carboniferous.
- Ginglymodi: gars and their cousins
- Giraffatitan X: a close relative of Brachiosaurus from the Jurassic of Africa
- Giraffoidea: giraffes, of course.
- Glaucosaurus X: a Texas edaphosaur known from a single specimen
- Glires: the clade uniting rabbits and rodents
- Gnathostomata: vertabrates with jaws
- Gobiconodon X: a stocky, well-known triconodont mammal from the middle Cretaceous of Asia and North America
- Gobiosuchidae X: a Triassic crocodyliform, sister of the Mesoeucrocodylia (the main line of Mesozoic croc evolution)
- Gondwanatheria X: the Gondwanan multituberculates
- Gorgonopsia X: dog-sized, dog-like therapsids -- the dominant carnivores of Late Permian
- Gorgosaurus X: a tyrannosaur, quite similar (and perhaps identical) to Albertosaurus
- Gracilisuchus X: a suchian, probably closely related to the Crocodylomorpha, from the Middle Triasic of Argentina
- Greererpeton X: a coleostid -- a sort of armored aquatic slamander from the Carboniferous of North America.
- Grippidia X: another Triassic aquatic diapsid, the sister of the Ichthyosauria
- Grossius X: a basal sarcopterygian with some porolepiform features
- Gruiformes: cranes and rails
- Gruimorpha: tentatively used as Passer> Anser
- Guerichosteidae X an important family of earlier psammosteids (big, pancake-shaped jawless fishes)
- Guildayichthyiformes X: a recently discovered early order of deep-bodied marine fishes with strong medial bones and unique cheek area
- Gymnophiona: living and extinct caecilians
-H-
- Hadrocodium X: an Early Jurassic almost-mammal from China
- Hadronector X:a Bear Gulch actinistian
- Hadrosauridae X: Hadrosaurus + Parasaurolophus
- Hadrosaurinae X: the hadrosaurids without the fancy crests
- Hadrosauroidea X: as we use it, Hadrosaurus > Iguanodon
- Haikouella X: the sister of Craniata, from the Early Cambrian of South China
- Halecomorphi: as we use it, Amia > teleosts
- Halecostomi: Amia + teleosts .
- Hallucicrania X: an aptly-named group uniting lanthanosuchids and pareiasaurs
- Hanosaurus X: a Chinese pachypleurosaur.
- Haplocanthosaurus X: a relatively small, basal sauropod from the Late Jurassic of North America
- Haplorhini: tarsirs, apes and monkeys
- Haptodus X: a well-known "pelycosaur" at the base of the sphenacodonts
- Haramiyida X: weird & poorly-known multituberculate-like proto-mammals from the Late Triassic and Early Jurassic
- Helohyidae X: The earliest members of the Suoidea, from the Eocene of South & Southeast Asia, China and North America.
- Hemicyclaspis X: a surprisingly derived osteostracan jawless fish from the Late Silurian of North America and Europe
- Henricosborniidae X: a family of basal notoungulates (endemic South American ungulates)
- HerrerasauridaeX: either very basal theropods or very derived dinosauromorphs from the Late Triassic of the Americas.
- Hesperornithiformes X: loon-like birds from the Cretaceous, sister of the Carinatae
- Heterodontiformes: the Port Jackson shark, a unique, basal galeomorph
- Heterodontosauridae X: very small, basal ornithopod dinosaurs with tusks from the Early Jurassic
- Heterostraci X: the main group of the "other" vertebrates Pteraspidomorphi)
- Heterostracomorphi X: Heterostraci and the astraspids
- Hibernaspidoidei X: amphiaspids with serrated headshields, frequently with mouth tubes
- Hilalia X: a rather primitive ungulate from the Middle Eocene of Turkey.
- Hippomorpha: horses > tapirs.
- Hippopotamidae: hippos
- Hirella X: an osteostracan jawless fish with plates on the ventral side as well, from the Silurian
- Holocephali: chimaeras and their ancestors with holostylic jaw suspensions
- Holopterygius X: a strange, scrappy, Frasnian fish most recently described as an actinistian
- Homalocephalidae X: sister group of the "bone-head" pachycephalosaurids
- Hominoidea: apes
- Huananaspidiformes X: really odd Early Devonian galeaspids from China
- Huayangosauridae X: the most basal family of stegosaurs
- Huayangosaurus X: the most basal of all known stegosaurs, from the Middle Jurassic of China
- Hybodontiformes X: the sister group of modern sharks
- Hylochoerus: the giant river hog
- Hylomyinae: gymnures or moonrats
- Hyopsodontidae X: insectivore-like animals with arboreal capabilities from the Paleocene through Eocene
- Hyotheriinae X: a group of mostly Miocene pigs
- Hyperoartia: Lampreys and their ancestors
- Hypnosqualea: Squatina + Raja, generally angel sharks, skates, rays, etc.
- Hypsilophodontidae X: small ornithischian dinosaurs
- Hypsilophodontinae X: advanced small to medium-sized lightly-built fast-running bipedal herbivorous hypsilophodont dinosaurs
- Hyracoidea: hyraxes
-I-
- Ianthasaurus X: a basal, Pennsylvanian genus of edaphosaur
- Ichthyopterygia X: the stem group of ichthyosaurs
- Ichthyornithiformes X: Chthyornis, stout, gull-like Late Cretaceous shore birds with large heads and strong wings
- Ichthyosauria X: ichthyosaurs
- Ichthyosaurus X: the classic ichthyosaur, from the Early Jurassic of Europe & North America
- Ichthyostega X: an early, well-known, but probably atypical tetrapod, from the Late Devonian of Greenland
- Ictidorhinidae X: a poorly-known Late Permian biarmosuchian therapsid
- Iguania: iguanid lizards and allies
- Iguanidae: iguanas
- Iguanodontia X: Iguanadon > Hypsilophodon, the hadrosaur stem lineage
- Iguanodontidae X: supposed to be the monophyletic iguanodonts -- possibly restricted to Iguanodon.
- Indrioidea: wooly lemurs, indri, sifakas
- Inflectosaurus X: large metoposauroid temnospondyls from the Early Triassic of Russia
- Iniopterygii X: a very odd Pennsylvanian group -- looking like a cross between a bat and a shark
- Insectivora: shrews, moles, hedgehogs, tenrecs. etc.
- Ionoscopiformes X
- Ischigualastia X
- Ischnacanthiformes X
-J-
- Jachaleria X
- Jainosaurus X
- Janenschia X
- Jeholodens X
- Jobaria X
- Jonkeria X
-K-
- Kannemeyeria X
- Kannemeyeriidae X:
- Karaurus X
- Katoporida X
- Katoporidae X
- Kayentachelys X
- Kayentatherium X
- Keicousaurus X
- Kentrosaurinae X: basal stegosaurids, small to large in size, with generally small spiked plates and numerous spikes along the tail.
- KentrosaurusX: a kentrosaurine with six small pairs of plates
- Keratocephalus X: a tapinocephalid with the naso-frontal boss raised into a sort of horn
- Kiaeraspidida X: tiny cornuate osteostracans, with reduced "horns" and sensory fields
- Kimmerosaurus X: a cimoliasaurid plesiosaur with a broad skull from the Late Jurassic of England
- Kotlassiidae X: a seymouriamorph reptilomorph similar to Seymouria, but perhaps less terrestrial, from the Late Permian of Russia
- Kowalevskiidae: radically simplified larvacean urochordates without endostyle, heart or spiracles
- Kronosaurus X: possibly the largest known pliosaur, from the middle Cretaceous of Gondwana
- Kuehneosauridae X: flying or gliding lepidosauriforms of the Late Triassic
- Kuehneotheriidae X: "obtuse-angle symmetrodonts"
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