Acutisoma spelaeum (Arachnida: Opilioes), an obligatory trogloxene from caves in southeastern Brazil: female taking care of eggs (Photo: Renata Nunes).

  Part of: Trajano E, Carvalho MR (2017) Towards a biologically meaningful classification of subterranean organisms: a critical analysis of the Schiner-Racovitza system from a historical perspective, difficulties of its application and implications for conservation. Subterranean Biology 22: 1-26.