T. seeleyi is the type and only species of Tricleidus. The holotype specimen (NHMUK R.3539) consists of disarticulated elements including most of skull and half the postcranium, from the Kosmoceras jason – Peltoceras athleta zones of the lowest deposits of the Oxford Clay.
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Callovian, Late Jurassic
Fletton, near Peterborough, England