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reference hagfish plus vertebrates. Agnathans are ectothermic, meaning they do not regulate their own body temperature. Agnathan metabolism is slow in cold water...

the extant hagfish, and this group may have split early on from other agnathans. The earliest jawed vertebrates probably developed during the late Ordovician...

aspís, 'shield') is a possibly monotypic genus of extinct osteostracan agnathan vertebrate. It was a trout-sized detritivorous fish that lived in the early...

Cardipeltis is an extinct genus of heterostracan agnathan from marine strata of early Devonian of Utah, and Wyoming. Species of Cardipeltis superficially...

Late Silurian of Canada, Norway, and the U.S. Tujiaaspis is a galeaspid agnathan from the early Silurian (Telychian) of China, showing origin of paired...

of the first reptiles include modern reptiles, mammals and birds; the agnathans have given rise to the jawed vertebrates; the bony fishes have given rise...

Diplograptina making their appearance. One of the earliest known armoured agnathan ("ostracoderm") vertebrates, Arandaspis, dates from the Middle Ordovician...

which then gave way to the Givetian 387.7 Ma. During this time the jawless agnathan fishes began to decline in diversity in freshwater and marine environments...

Hirofumi; Takahashi, Yoshimasa; et al. (2007). "Antigen-receptor genes of the agnathan lamprey are assembled by a process involving copy choice". Nature Immunology...

androgen receptor first appeared in gnathostomes (jawed vertebrates). Agnathans (jawless vertebrates) such as lampreys do not produce testosterone but...

Liliaspis philippovae is an extinct cyathaspidiform heterostracan agnathan from early Devonian marine strata of the Ural Mountains. Liliaspis was, at various...

Early Silurian - Late Devonian Reconstruction of the Late Silurian anaspid agnathan Cowielepis ritchiei, of Cowie Bay, Scotland Scientific classification Domain:...

Palaeodus is an extinct genus of thelodont agnathan that lived during the Lower Ordovician period near present-day Saint Petersburg, Russia. Rohon, J....

Protaspis is an extinct genus of pteraspidid heterostracan agnathan which lived during the Early Devonian of the United States, with fossils found in marine...

Khonsari, R. H.; Li, B.; Vernier, P.; Northcutt, R. G.; Janvier, P. (2009). "Agnathan brain anatomy and craniate phylogeny". Acta Zoologica. 90 (s1): 52–68....

developed medulla oblongata. Since these are both very similar to early agnathans, it has been suggested that the medulla evolved in these early fish, approximately...

conclusion of the Devonian. The Heterostracans differed from other Paleozoic agnathan taxa both in the arrangement and histology of their scales. Most heterostracans...

S2CID 85924210. Turner, S.; Tarling, D. H. (1982). "Thelodont and other agnathan distributions as tests of Lower Paleozoic continental reconstructions"...

in Evolving Planet Type Specimen Notes Cardipeltis agnathan fossil skeleton Drepanaspis agnathan fossil skeleton Tiktaalik sarcopterygian fossil skeleton...

Rhinopteraspis is an extinct genus of pteraspidid heterostracan agnathan. "Rhinopteraspis cornubica (McCoy), with notes on the classification and evolution...