Sophia Papaioannou, Redesigning Achilles: 'Recycling' the Epic Cycle in the 'Little Iliad': (Ovid, Metamorphoses 12.1–13.622), (Untersuchungen zur antiken Literatur und Geschichte, 89) Berlin/New York: Walter De Gruyter, 2007, divides the Argonauts among "Orphics" and "Heracleans", those of skill and those of brute strength: Caeneus is among the Heracleans. Ovid's story of the transsexual Caeneus "revisits and reverses the gendered polarity of traditional epic", according to Ioannis Ziogas (Cornell University), reviewing Papaioannu in Bryn Mawr Classical Review 2008.
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Pindar, frag 166: "Caeneus, struck by the green fir-trees, cleft the ground with his foot, where he stood, and passed beneath the earth," trans. Sandys. An illustration from an Attic vase-painting depicts the centaurs also using boulders to crush Caeneus, see here. Ovid mentions oaks.
Anecdota Graeca e codd. manuscriptis Bibliothecarum Oxoniensium, Volume III, p. 412
jstor.org
Pàmias, Jordi. “INCORRUPTIBLE SOCRATES? (Pl. Smp. 219e and Acus. Frag. 22).” Hermes, vol. 140, no. 3, 2012, pp. 369–374. JSTOR. Accessed 3 Sept. 2021.
Acusilaus, frag 22; "Poseidon had sexual intercourse with Caene. Thereupon – because it was not holy for her to bear children either to him or anyone else – Poseidon made her an invulnerable man," trans. Toye (slightly adapted).
Pindar, frag 166: "Caeneus, struck by the green fir-trees, cleft the ground with his foot, where he stood, and passed beneath the earth," trans. Sandys. An illustration from an Attic vase-painting depicts the centaurs also using boulders to crush Caeneus, see here. Ovid mentions oaks.