2003), disarticulated cephalaspids, placoderms
and acanthodians, and both articulated and disarticulated eurypterids (Miller 2007a).
Like Entelognathus, Qilinyu had a three-part jaw, though the creature looked a bit more like a typical placoderm
, Ahlberg says.
It was assumed placoderms
died out and a different group evolved into bony fish.
It is a member of an extinct group of fish called placoderms
whose heads and bodies were mostly covered in armor, with jaws that had bony plates, called gnathal plates, which acted like teeth.
were also some of the first vertebrates to have necks separating their heads and shoulder bones, allowing the fish to move their heads independently of the rest of their bodies.
Bottom line: not part of a placoderm
, or of any other kind of Devonian fish.
The Late Devonian placoderm
Aspidichthys Newberry, 1873 from the Holy Cross Mountains, Poland.
The Andreyevka-2 community including antiarch placoderms
, acanthodians, chondrichthyans and osteichthyans, as well as tetrapods, has been discussed on repeated occasions by the first author of this paper (Lebedev 1986, 1992, 2013; Lebedev et al.
Actinolepis tuberculata Agassiz, Homostius sp.
They are represented by undetermined placoderms
, acanthodians and sarcopterygians (Fig.
The ichthyoassemblage belongs to the Pycnosteus tuberculatus psammosteid Zone and the Asterolepis delli placoderm
Zone, and includes the psammosteids Pycnosteus tuberculatus (Rohon), Ganosteus stellatus Rohon (Glinskiy 2012); the placoderms
However, a closer inspection by Long and research team revealed they were the tiny bones of unborn fish from two adult species of arthrodires (Incisoscutum ritchiei) - the biggest and most diverse placoderm