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Histology of herniations through the body wall and cuticle of zooplankton from the Laurentian Great Lakes.

Zooplankton of the Laurentian Great Lakes developed hernial protrusions whose gross appearance matches those on zooplankton described elsewhere in the world. We have carried out a histologic and cytologic analysis of the protrusions and found that they are composed of apparently degenerating or necrotic tissue(s) that has been expressed from the organism through the process of herniation. At their base the protrusions are continuous with viable tissue(s) within the organism through a fissure in the exoskeleton. Our observations lead us to suspect that these hernial protrusions are lethal. The development of such protrusions in zooplankton may be a worldwide phenomenon, but the cause of the herniation remains a mystery.