Valveless single chambered heart is found in ________.

Herdmania

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Scoliodon

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Catla

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Amphioxus

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Solution

The correct option is A Herdmania
The heart of Herdmania is enclosed within the pericardium and is attached to its wall along its entire length by a thin mesentery like connective tissue flap. It is formed by an in folding of the pericardium but it is highly contractile, thin walled and contains striated muscles. Both ends of the hearts are open.
So, option A is the correct option.

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