The presence of osteostracan, anaspid, thelodont, acanthodian and possible placoderm remains in the Eastport Formation of Maine mirrors the vertebrate fauna known elsewhere in the Lower Old Red Sandstone of eastern North America and Europe (e.g., Denison 1956; the 'Cephaslaspid province of Young 1981; the North Atlantic province of Dineley and Loeffler 1993; and the 'central Appalachian zone' of Blieck and Janvier 1999, Burrow et al.
The osteostracan and anaspid remains are not readily identified to species level, particularly with so few specimens; but they generally resemble those from the late Silurian - Early Devonian Old Red Sandstone facies (e.g., Denison 1956; Blom et al.
There is no authentic publication saying exactly which beds thelodont and osteostracan
specimens come from.
Rich thelodont, osteostracan
and anaspid fauna with Phl.
hedei, remains of several thelodont and osteostracan
agnathans were found on both islands (Klubov et al.
However, the acanthodians, thelodonts and osteostracans
from the majority of the Gotland stratigraphy are still in need of taxonomic review and revision.
carinatus (Pander), Paralogania martinssoni (Gross), Phlebolepis elegans Pander, osteostracans
Tremataspis milleri Patten, Tr.
Vertebrates are represented in the Riksu drill core by the scales of thelodonts and shield fragments of osteostracans
. Three distinctive assemblages of agnathans are recognized in the Riksu and Rootsikula formations (Wenlock) and in the Paadla Formation (Ludlow).
Luha produced only a short paper on osteostracans
of Saaremaa (Luha 1940), but more than 70 examples were studied in Oslo and named Coelolepis luhai Kiaer, 1932, in a paper that was edited by A.
During the study of Estonian Silurian osteostracans
and the thelodont Phlebolepis elegans Pander in the Geological Museum at the University of Tartu, material found by Edmund Bolau at the time of the 2nd World War in the Himmiste Quarry, Saaremaa Island, caught my attention.
Microrelief on the exoskeleton of some early osteostracans
(Agnatha): preliminary analysis of its significance.
is similar to osteostracans
by having bone cell cavities in its exoskeleton.