Classification of Extinct Species?

📌 CONCEPT: Taxonomists justify the inclusion of extinct species in biological classification systems by considering their fossilised remains and characteristics that are similar to those of their living relatives.

📐 RULE / FORMULA: The key principle is that extinct species are included in classifications based on their phylogenetic relationships with living species, even though they do not exhibit living characteristics.

💡 WORKED EXAMPLE: For instance, the discovery of dinosaur fossils led to their classification as reptiles, even though they are extinct. This is because dinosaurs exhibit characteristics similar to those of modern reptiles, such as scaly skin and laying eggs.

⚠️ COMMON MISTAKE: Students often confuse the inclusion of extinct species with the concept of 'missing links' in evolution. However, extinct species are included in classifications to show their evolutionary relationships with living species, not to represent transitional forms between different groups.