BINGO. “I introduce the idea of horizontal larval transfer.” Ouch. Clunky. But possibly, tantalizingly, fascinating.
https://books.google.es/books?hl=en&lr=&id=4Bv_CAAAQBAJ&oi=fnd&pg=PR3&dq=evolution+of+larval+stage&ots=Ajv40BxpV8&sig=UoAuSNQhyUJxvYurqij18mPF3GM