MONSTRILLA-ELONGATA, A NEW MONSTRILLOID COPEPOD (CRUSTACEA, COPEPODA,MONSTRILLOIDA) FROM A REEF LAGOON OF THE CARIBBEAN COAST OF MEXICO

A new species of a monstrilloid, Monstrilla elongata, is described fro m plankton samples collected in a reef lagoon along the northern porti on of the eastern coast of the Yucatan Peninsula. The new species is d escribed from a single female and can be distinguished from the other species of Monstrilla by the combination of the body proportions, a si ngle-lobed fifth leg bearing only two setae, furcal rami with five set ae, and the unusual annulated structure of the ovigerous spines.