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''Silurolepis platydorsalis'' is a species of 
''S. platydorsalis'' was previously considered a basal
Silurian
The Silurian ( ) is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the third and shortest period of t ...
-aged "maxillate" early placoderm
Placoderms (from Ancient Greek πλάξ 'plax'', ''plakos'''Plate (animal anatomy), plate' and δέρμα 'derma'''skin') are vertebrate animals of the class (biology), class Placodermi, an extinct group of prehistoric fish known from Pal ...
that has been described from (mostly) articulated remains. Although it has been known for several years, it was finally described by Zhang et al., in 2010.
''S. platydorsalis'' was previously considered a basal antiarch
Antiarchi ("opposite anus") is an order of heavily armored placoderms. The antiarchs form the second-most successful group of placoderms after the arthrodires in terms of numbers of species and range of environments. The order's name was coin ...
, but a 2019 study instead recovers it as a maxillate placoderm most closely related to ''Qilinyu
''Qilinyu'' is a genus of early placoderm from the late Silurian (late Ludfordian stage, ~423 Ma) of China. It contains a single species, ''Qilinyu rostrata'', from the Xiaoxiang fauna of the Kuanti Formation. Along with its contemporary ''Entelo ...
''.
''S. platydorsalis'' is known from thoracic armor: as the specific name suggests, the dorsal side is very flat.
References
Placoderms of Asia Silurian fish of Asia Fossil taxa described in 2010 Placoderm genera {{placoderm-stub