-
embryological data,
strongly supports the
hypothesis that both
groups of
living agnathans,
hagfishes and lampreys, are more
closely related to each
other than to...
- 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...
-
Conodonts (Gr**** kōnos, "cone", + odont, "tooth") are an
extinct group of
agnathan (jawless)
vertebrates resembling eels,
classified in the
class Conodonta...
-
Diplograptina making their appearance. One of the
earliest known armoured agnathan ("ostracoderm") vertebrates, Arandaspis,
dates from the
Middle Ordovician...
- 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...
-
Early Silurian - Late
Devonian Reconstruction of the Late
Silurian anaspid agnathan Cowielepis ritchiei, of
Cowie Bay,
Scotland Scientific classification Domain:...
-
Cardipeltis is an
extinct genus of
heterostracan agnathan from
marine strata of
early Devonian of Utah, and Wyoming.
Species of
Cardipeltis superficially...
- 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...
