The Functional Morphology and Geographical Distribution of <i>Planktomya Henseni</i>, a Supposed Neotenous Pelagic Bivalve1

Abstract

Planktomya henseni Simroth 1896 is a pelagic bivalve widely distributed throughout the warm-temperate and tropical North and South Atlantic Ocean. It is also known from a single collection in the tropical Pacific Ocean. The geographical distribution of Planktomya is probably circumtropical.