Question

$Tachyglossus$ is a connecting link between

• A. Reptiles and Aves
• B. Amphibians and Reptiles
• C. Aves and Mammals
• D. Reptiles and Mammals

Answer 1

The correct option is D Reptiles and Mammals

The three genera of monotremes, the duck-billed platypus (Ornithorhynchus) and the echidnas or spiny anteaters (Tachyglossus and Zaglossus) are the most primitive modern mammals. They share certain characteristics of both birds and reptiles which are not seen in other mammals. In particular, the reproductive system consisting of cloaca is similar to the reproductive system in reptiles, ability to lay eggs etc make them more close to reptiles. However, they are hairy endotherms which suckle their young and have a single bony element in the lower jaw making them mammals. Thus, they are considered to be a connecting link between reptiles and mammals. Thus, the correct option is D.