New eyes discovered in trilobites UniCologne SciReports
shows, at the front of the glabella, three almost identically shaped dark, unconspicious tiny oval spots of equal size . These three structures are lined up in parallel, slightly fanning out on the underside. All of the three spots are characterised by a smooth, clear outline, and an equal, homogenous dark brownish colour.
Because the upper part of the specimen is covered by a part of a larger trilobite of the same species, it is reasonable to assume that the median eyes here pertain also to a larval stage.In summary one may conclude that median eyes were really present in trilobites. That the described structures of trilobites, and of the other palaeozoic arthropods analysed here, are indeed median eyes is concluded by structural comparison to median eyes of to trilobites related extant arthropods.
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