Most conspicuous among the appendages of the head are the feelers or antennae, which correspond to the anterior feelers A (antennules) of Crustacea. [Please select]
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Assuming a swimmeret of the third, fourth, or fifth somite to be the least changed from the primitive type, what changes were necessary to make the sixth swimmeret; the third maxilliped; the walking legs; the antennæ; the antennules. [Please select]
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