The best replacement for trilobite is horseshoe crab.

The best alternatives to trilobite are rated as following:
★★★★★  horseshoe crab
★★★  roomba

Your alternative for trilobite is not listed? Suggest!
Speaking about trilobite, one probably shouldn't forget about footprint.

Other search terms related to trilobite and their ratings are:
★★★★★ footprint
★★★★ human footprint
★★ human footprint on it
★ sandal print
You have in mind a companion for trilobite and it is not yet here? Propose!



Google Trends

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trilobite
horseshoe crab
roomba