Confusing animals/Taxonomy Misconceptions

I’m not sure I agree with that assessment. Dinosaurs were most likely one type of reptile, which is now extinct (I am by no means a reptile expert!). The extinct Trilobites are still classed as Arthropods in spite of not resembling any modern Arthropod. Mind you, I still cling to the belief that Arthropods are not monophyletic group!