The largest species recorded is Poromitra curilensis at up to 18 centimetres standard length ( SL ; a measurement excluding the caudal fin ) .
Poromitra curilensis is a Pacific ridgehead related to the crested bigscale .
The largest species recorded is Poromitra curilensis , a Pacific ridgehead related to the crested bigscale , at up to 18 centimetres standard length ( SL ; a measurement excluding the caudal fin ) .