Entelognathus

Entelognathus primordialis (Zhu et al. 2013; Late Ludlow, Late Silurian, 419 mya; IVPP V18620) is a genus of placoderm fish with tiny eyes. Here skull bones are re-identified with their tetrapod homologies. Pre-teeth are tiny pustules and wrinkles on the bone.

Carr RK, Joahnson Z and Ritchie A 2009. The phyllolepid placoderm Cowralepis mclachani: Insights into the evolution of feeding mechanisms in jawed vertebrates. Journal of Morphology 270(7):775–804.

Cui X-D, Friedman M, Yu Y, Zhu Y-A and Zhu M 2023. Bony-fish-like scales in a Silurian maxillate placoderm. Nature Communications doi.org/10.1038/s41467-023-43557-9

Zhu M, Yu X-B, Ahlberg PE, Choo B and 8 others 2013. A Silurian placoderm with osteichthyan-like marginal jaw bones. Nature. 502:188–193.

Zhu M et al. 2016. A Silurian maxillate placoderm illuminates jaw evolution. Science 354.6310 (2016): 334-336.

wiki/Entelognathus

Placodermi

Drepanaspis

Qilinyu

Manta