How get Class[_ <: A]] with lower bound

Hello ) I have one abstract class and several concrete classes in Java

abstract class SpecificRecordBase {}
class A extends SpecificRecordBase 
class B extends SpecificRecordBase
....

Also I have a map in Scala. I want to put key String and value as a class to use it in method:

def test(m: Map[String, Class[_ <: SpecificRecordBase]]):Unit = ???

I tried to ClassTag(ClassLoader.getSystemClassLoader.loadClass(stringClassName)).runtimeClass but got an error. Also I tried to create method and use it

  def getClass[T <: SpecificRecordBase](ct: ClassTag[T]): Class[T] = ct.runtimeClass

And also have an error
 Error:(10, 73) type mismatch;
 found   : Class[_$1] where type _$1
 required: Class[T]
  def getClass[T <: SpecificRecordBase](ct: ClassTag[T]): Class[T] = ct.runtimeClass

Could you help me please?