Although their work in the philosophy of biology is not well known, Heidegger, Merleau-Ponty, and Ruyer all offer interesting and heterodox accounts of the life and environmental sciences and the organism in particular. In this chapter, we discuss their respective views, with a focus on their shared criticisms of Neo- Darwinism and the way this tradition grasped the structural coupling between organism and environment. We also outline some significant differences between each of them concerning how to conceive of that holistic (...) relation and the extent of “captivation” of the animal to its environment. Given that there are indications that the twenty-first century might be post-genomic/epigenetic, we argue that it is worth revisiting these neglected organicist trajectories that sought to navigate between mechanism and vitalism. (shrink)