Fig. 1. The Wettstein tesseract – a in The Wettstein tesseract: A tool for conceptualising species-rank decisions and illustrating speciation trajectories

Fig. 1. The Wettstein tesseract – a four-dimensional hypercube for illustrating species delimitation and speciation trajectories, with the four dimensions representing geographical differentiation, ecological divergence, morphological difference, and genealogical independence, respectively, and species rank attributed to the vertices in red (while vertices in black and white indicate infraspecific diversification patterns without or with significant contribution of a genealogical factor, respectively).