Abstract
ABSTRACT Parapenaeopsisballi, the only representative of the genus in American waters, was originally described from two small males. On the basis of over 100 specimens, among which are many females, it is redescribed in detail, including the first accounts of the appendix masculina, thelycum, and seminal receptacles. Variations in several morphological features are assessed and differences of the species from its closest relatives are discussed. The range of this shrimp along the Pacific American coast, previously recorded only from El Salvador, is found to extend as far north as Bahia de Banderas, Jalisco, Mexico.
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