Palaeos Vertebrates: 50.400 Thelodonti: Cephalaspidomorphi
Most of the Polybranchiaspidida (i.e., the Huananaspidiformes) have a long
rostral ... Note: [1] Likely paraphyletic stem group of Polybranchiaspidida. ...
www.palaeos.com/Vertebrates/ Units/050Thelodonti/050.400.html

Galeaspida
The Eugaleaspidiformes and Polybranchiaspidida are sister-groups and share a ...
The Polybranchiaspidida are characterized by a very large number of gill ...
tolweb.org/Galeaspida

Diversification and faunal shift of Siluro-Devonian vertebrates of ...
The beginning of the Devonian saw a very rapid diversification of the
Polybranchiaspidida, with four families differentiated (Pentathyraspididae ...
doi.wiley.com/10.1002/gj.1072

Anaspida (fossil fish) -- Britannica Online Encyclopedia
Britannica online encyclopedia article on Anaspida (fossil fish), ...major
clades (Polybranchiaspidida and Eugaleaspidiformes) and numerous species.
www.britannica.com/EBchecked/topic/22817/Anaspida

Palaeos Vertebrates 50 Thelodonti: References
... |--Eugaleaspidiformes | | `--Polybranchiaspidida | `--+--Pituriaspida | `--
Osteostraci | |--Ateleaspis | `--Cornuata `--+--Loganiidae `--Gnathostomata ...
www.palaeos.com/Vertebrates/Units/ 050Thelodonti/References.html

Phylogenetic relationships of galeaspids (Agnatha)
the other is represented by the Polybranchiaspidida (Node C in Fig. 7). ...
pidiformes and the Polybranchiaspidida. The Geraspididae ...
www.springerlink.com/index/05577N154P61X325.pdf

agnathan (fish) :: Annotated classification -- Britannica Online ...
2 major clades (Polybranchiaspidida and Eugaleaspidiformes) and numerous species
. Early Silurian to Late Devonian (444–359 million years ago). ...
www.britannica.com/EBchecked/topic/9280/ agnathan/63381/Annotated-classification

Galeaspida - Wikipedia, the free encyclopedia
Jan 23, 2009 ... Galeaspids are also the vertebrates which have the largest number of gills, as
some species of the order Polybranchiaspidida (literally ...
en.wikipedia.org/wiki/Galeaspida

A brief review of studies on palaeogeography of Middle Paleozoic ...
J. Pan and L. Chen, Geraspididae, a new Family of Polybranchiaspidida (Agnatha)
from Silurian of North Anhui. Vertebr. PalAsiat. 31 3 (1993), pp. 225–230. ...
linkinghub.elsevier.com/retrieve/pii/0743954796000244

Main Groups of Chordates
Aug 22, 2003 ... 1937 †Galeaspida (galeaspids) †Eugaleaspidiformes †Polybranchiaspidida †
Polybranchiaspidiformes †Huananaspidiformes †Osteostraci ...
www.helsinki.fi/~mhaaramo/metazoa/ deuterostoma/chordata/chordata_index.html