The following species were used in the trials (Figure 3): Xysticussp. and Mecaphesa celer (Thomisidae),Cheiracanthium inclusum(Eutichuridae, Ramírez, 2014), and Phidippus princeps. Phidippus princepsis an active diurnal hunter from the Salticidae family with high visual acuity, and was tested to confirm if the experimental set up provided the same results as those obtained by Jakob et al.(2018) using an eyetracker. Cheiracanthium inclusumis an active nocturnal hunter and has eight eyes evenly arranged in two rows of four. Xysticus sp.and M. celerare members of the family Thomisidae, characterized for being diurnal ambush predators that hunt pollinators in flowers. The principal eyes of Misumena vatia, another Thomisidae with a similar eye arrangement, overlap entirely with one pair of secondary eyes (the ALEs), and partially with the rest of secondary eyes (Insausti et al. 2011). The principal eye retinas of M. vatia are equipped with two muscles arranged similarly to those of C. salei(Insausti et al. 2011). The principal eyes of M. vatia have a wider field of view (Insausti et al. 2011) than those of jumping spiders. In thomisids, the PMEs look upwards for aiding in the detection of aerial prey like bees.
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