Fitch2004, 188, n. 10. Fitch lists the other instances in which belua = ‘sea-beast’ in Seneca’s tragedies and in Ovid’s Metamorphoses, but he does not consider how the word is used generally by Seneca in his other texts, in contemporary language more broadly, or in Latin as a whole, nor does he consider belua from an interpretive angle. Ultimately, Fitch finds the possibility unconvincing due to Argos’s distance from the coast.
See also Volk2006, 183-200. For more on the cosmic aspect of Thyestes and Atreus, especially in relation to Stoic cosmology, see also Rosenmeyer 1989 and Owen 1968, 291-313.
See Schiesaro2003, 151-153for a similar argument about Atreus, but emphasizing the collapse of god and man.