Number of lateral hearts in Pheretima are

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(D) In $Pheretima$ (earthworm),there are $4$ pairs of hearts,which are known as lateral hearts and lateral-oesophageal hearts.Specifically,the lateral

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$4$

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(D) In $Pheretima$ (earthworm),there are $4$ pairs of hearts,which are known as lateral hearts and lateral-oesophageal hearts.Specifically,the lateral hearts are located in the $7^{th}$ and $9^{th}$ segments.These lateral hearts connect the dorsal blood vessel to the ventral blood vessel.Since there are $2$ pairs of lateral hearts (one pair in the $7^{th}$ segment and one pair in the $9^{th}$ segment),the total number of lateral hearts is $4$.

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