[Taxacom] Type species from unavailable genus name

[Mikhail Daneliya]

Genus A was described for two species after 1931, but type species was not
designated. The genus name A is thus unavailable. Despite that more species
under genus name A have been described subsequently. One of them seems to
be a new genus B, with a type species by monotypy. What is the correct name
for the type species? A. somespecies Originalauthor, Year; B. somespecies
(Originalauthor, Year); or else?
Appreciate your help!

Mikhail Daneliya