![]() ![]() The mandible of the metanauplius becomes massive, and a spiniform process from the first endopodal segment forms a chelate complex with the distinctly curved, clawlike second endopodal segment. In most other copepods, the one-seta or one-spine maxillule appears no earlier than NII. ![]() amphiodiae NI are the presence of one pair of setae on the labrum, a character unique among Copepoda, and the presence of a maxillule represented by one seta, making the larva a metanauplius by definition. We provide the first full descriptions for a thaumatopsyllid of the NI, parasitic metanauplii, and free-living copepodid I to copepodid VI of the female and male based on developmental stages obtained. amphiodiae collected from its burrowing host, Amphiodia urtica, and reared in the laboratory gave rise to ovigerous females that released free-swimming first nauplii (NI). Although most parasitic copepods produce free-living larvae, Caribeopsyllus amphiodiae and other thaumatopsyllid copepods have a parasitic larval stage (metanauplius) that inhabits an ophiuroid stomach.
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