Pinna is absent in which of the following gro | vedclass

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Question

(A) The pinna (external ear) is a characteristic feature of most mammals. However,in the order $Sirenia$ (which includes aquatic mammals like manatees

Vedclass · Accepted Answer

Sirenia

Vedclass · Answer

(A) The pinna (external ear) is a characteristic feature of most mammals. However,in the order $Sirenia$ (which includes aquatic mammals like manatees and dugongs),the pinna is absent as an adaptation to their fully aquatic lifestyle. $Primates$ and $Rodentia$ possess well-developed pinnae. Therefore,the correct answer is $Sirenia$.

Pinna is absent in which of the following groups?

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