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

Galeaspida: Facts, Discussion Forum, and Encyclopedia Article
Polybranchiaspidida (literally "many gills shields") had up to 45 gill openings.
The body is covered with minute scales arranged in oblique rows and there ...
www.absoluteastronomy.com/topics/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

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

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

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

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

Palaeos Vertebrates 50 Thelodonti: Cladogram
... •X | | `--Polybranchiaspidida X | | |--Polybranchiaspidiformes •X | | `--
Huananaspidiformes •X | `--+--Pituriaspida •X | `--Osteostraci X ToL, ...
www.palaeos.com/Vertebrates/ Units/050Thelodonti/Cladogram.html