-
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...
-
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...
- 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....
- 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...
- Hirofumi; Takahashi, Yoshimasa; et al. (2007). "Antigen-receptor
genes of the
agnathan lamprey are ****embled 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...
