These communicative relationships are, in fact, replicators in Dawkins’s sense.
The clearest examples of gene-in-sender to gene-in-receiver communication involve pheromonal communication.
Pheromonal communication is more direct than tactile, auditory, and visual communication, all of which involve more or less complex sending and receiving mechanisms, which themselves are genetically based.
This is particularly true of pheromonal communication involving peptides, which are direct genetic products (I.e., chains of amino acids).