- from the
Middle Silurian to Late Devonian.
Anatomically speaking, the
osteostracans,
especially the
Devonian species, were
among the most
advanced of all...
- Gr****: ἀσπίς aspís, 'shield') is a
possibly monotypic genus of
extinct osteostracan agnathan vertebrate. It was a trout-sized
detritivorous fish that lived...
- Keating,
Joseph N.; Sansom,
Robert S.; Purnell, Mark A. (2012). "A new
osteostracan fauna from the
Devonian of the
Welsh Borderlands and
observations on...
-
Benneviaspidida is an
order of
osteostracan jawless fishes which lived in the
Early Devonian. The
fishes in this
order have a flat
headshield and are dorsoventrally...
-
Cephalaspidomorphs are a
group of
jawless fishes named for
Cephalaspis of the
osteostracans. Most
biologists regard this
taxon as extinct, but the name is sometimes...
- most do have a
dorsal or a
caudal fin. Some
fossil agnathans, such as
osteostracans and pituriaspids, did have
paired fins, a
trait inherited in
their jawed...
-
Boreaspis (meaning "Boreas's Shield") is an
extinct genus of
osteostracan agnathan vertebrate that
lived in the
Devonian period.
Fourteen different species...
- Tiiu; Vahur, Signu; Kirsimäe,
Kalle (6 May 2022). "A
demineralized osteostracan fossil from the
Silurian Kalana Lagerstätte of Estonia:
revealing its...
-
Placoderms also
share certain anatomical features only with the
jawless osteostracans;
because of this, the
theory that
placoderms are the
sister group of...
- the Devonian. Most
lingering agnathan (jawless fish) groups, such as
osteostracans, galeaspids, and heterostracans, also went
extinct by the end of the...
