Anaspida ("without shield") is an extinct group of primitive jawless vertebrates that lived during the Silurian period. They were once classically regarded as the ancestors of lampreys. Anaspids were...
Anaspida - Wikipedia
Conodonts (Greek kōnos, "cone", + odont, "tooth") are extinct chordates resembling eels, classified in the class Conodonta. For many years, they were known only from tooth-like microfossils found in ...
Conodont - Wikipedia
Galeaspida (from Latin, "Helmet shields") is an extinct taxon of jawless marine and freshwater fish. The name is derived from galea, the Latin word for helmet, and refers to their massive bone shield ...
Galeaspida - Wikipedia
Heterostraci ("Different scales") is an extinct subclass of pteraspidomorph jawless vertebrate that lived primarily in marine and estuary environments. The first identifiable heterostracans appear in ...
Heterostraci - Wikipedia
Hagfish, the class Myxini (also known as Hyperotreti), are eel-shaped, slime-producing marine fish (occasionally called slime eels). They are the only known living animals that have a skull but no ver...
Hagfish - Wikipedia
The class Osteostraci ("Bony Shields") was a group of bony-armored jawless fish, termed "ostracoderms", that lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devo...
Osteostraci - Wikipedia
Lampreys (sometimes also called lamprey eels) are any jawless fish of the order Petromyzontiformes. The adult lamprey may be characterized by a toothed, funnel-like sucking mouth. The common name "l...
Petromyzontiformes - Wikipedia
The Pituriaspida ("Pituri Shield") are a small group of extinct armored jawless fishes with tremendous nose-like rostrums, which lived in the marine, deltaic environments of Middle Devonian Australia ...
Pituriaspida - Wikipedia
Pteraspidomorphi is an extinct group of early jawless fish. They have long been regarded as closely related or even ancestral to jawed vertebrates, but the few characteristics they share with the latt...
Pteraspidomorphi - Wikipedia
Thelodonti (from Greek: "feeble teeth") is a class of extinct jawless fishes with distinctive scales instead of large plates of armor.There is much debate over whether the group of Palaeozoic fish kno...
Thelodonti - Wikipedia
Pituriaspis doylei
Pituriaspis doylei (Doyle's pituri shield) was one of two known species of jawless fish belonging to the Class Pituriaspida, and is the better known of the two. The species lived in estuaries during ...
Pituriaspis doylei - Wikipedia
Nemamyxine is a genus of hagfish. It contains two species.
Arandaspis prionotolepis is an extinct species of jawless fish that lived in the Ordovician period, about 480 to 470 million years ago. Its remains were found in Alice Springs, Australia in 1959, but ...
Arandaspis - Wikipedia
Priscomyzon riniensis
Priscomyzon riniensis is an extinct lamprey that lived some 360 million years ago during the Famennian (Late Devonian) in a marine or estuarine environment South Africa. This small agnathan is anatomi...
Priscomyzon riniensis - Wikipedia
Nochelaspis is an extinct genus of Galeaspida.
Nochelaspis - Wikipedia
Endeiolepis is an extinct jawless fish that lived during the Late Devonian period, similar to that of living lampreys for its gill pouches, but Endeiolepis had an unusually large number of gill pouche...
The northern lampreys (Petromyzontidae) are a family of lampreys. Northern lampreys (Petromyzontidae) have the highest number of chromosomes (164-174) among vertebrates.
Petromyzontidae - Wikipedia
Tesakoviaspis concentrica
Tesakoviaspis concentrica is an extinct species of primitive jawless fish from the Middle Ordovician.
Boreaspis ("Boreas' Shield") is an extinct genus of primitive jawless fish that lived in the Devonian period. Fourteen different species of Boreaspis have been found in sandstone of the lagoons and es...
Myxine glutinosa
Myxine glutinosa, known as the Atlantic hagfish in North America, and often simply as the hagfish in Europe, is a species of jawless fish of the genus Myxine.
The distribution of Myxine glutinosa ...
Myxine glutinosa - Wikipedia
Lake lamprey
The lake lamprey (Entosphenus macrostomus) or Vancouver lamprey is a species of lamprey in the Petromyzontidae family. It is endemic to Canada.
Cephalaspidomorphs are a group of jawless fishes named for the cephalaspids, a group of osteostracans. Most biologists regard this taxon as extinct, but the name is sometimes used in the classificati...
Cephalaspidomorphi - Wikipedia
Phlebolepis elegans is an extinct thelodont agnathan belonging to the family Phlebolepididae. Whole fossils are found in Early Silurian (Llandovery) aged strata from Saaremaa, Estonia. Phlebolepis w...
Caribbean Hagfish
Myxine mcmillanae, the Caribbean hagfish, is a species of hagfish. It is a scaleless, eel-like fish found in Caribbean waters that feeds off material from the surface that drifts down. It is rarely s...
List of prehistoric jawless fish genera
This list of prehistoric jawless fish is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be jawless fish, excluding purely vernacula...
List of prehistoric jawless fish genera - Wikipedia
Hyperoartia or Petromyzontida is a disputed group of vertebrates that includes the modern lampreys and their fossil relatives. Examples of hyperoartians from early in their fossil record are Endeiole...
Hyperoartia - Wikipedia
Hemicyclaspis (meaning half-round shield or semicircle plate) is an extinct genus of primitive jawless fish, closely related to Cephalaspis, that lived in the Devonian period in what is now Europe and...
Hemicyclaspis - Wikipedia
Pacific lamprey
The Pacific lamprey (Entosphenus tridentatus) is an anadromous parasitic lamprey from the Pacific Coast of North America, and Asia. It is also a member of the Petromyzontidae family. The Pacific lampr...
Pacific lamprey - Wikipedia
Semipodolaspis is an extinct genus of jawless vertebrate.
Semipodolaspis - Wikipedia
Periodon is a genus of conodonts which existed in what is now Canada, Iran, Argentina, China, Russia, and the United States during the Ordovician Period. It was described by Hadding in 1913, and the t...