oral plate मीनिंग इन हिंदी

Ventrally, the ventral lip of the mouth is armed with long series of small oral plates which recall those of heterostracans.
An element of the median oral plates ( that would correspond to the lower lip or chin in gnathostomes ) extends out in a long rod-shaped appendage, called the " pseudorostrum . " The tail is long and slender, and has large rows of thick scales.