Abstract
A new genus and three new species of Ammotheid pycnogonids are described from waters off North Carolina, U.S.A. The Ammotheids new to science are Nymphopsis dromedaria, Nanymphon grasslei (gen. n.), and Ascorhynchus pyrginospinum. Eurycyde clitellaria Stock, known only from the type collected in the Virgin Islands, has also been recorded. The range of a fifth species, Pycnogonum cessaci Bouvier (family Pycnogonidae), is extended to include the Western North Atlantic. Comments are made on the ecology and associated organisms of the five species. A modified key to the known species of Nymphopsis is included.

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