Tag Archives: lamprey

Odd vertebrate gets rid of hundreds of genes early in development

Enlarge / There’s no jaw on the front of that face, and all the tissues you see have deleted hundreds of key developmental genes. (credit: Michael Heck, Oregon Fish and Wildlife)

Sea lampreys are parasites native to the northern and western Atlantic Ocean that suck blood and other vital fluids from their fellow fish. They have the distinction of possibly being the first destructive invasive species in North America; they entered the Great Lakes in the 1830s through the Welland Canal and have been killing trout there ever since.

They also have the distinction of having split off from the rest of the vertebrate lineage very early on, about 550 million years ago, before the evolution of jaws. This makes lampreys useful as a model

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