clonal immortality apart, there are certain species whose individual lifespans stand out among earth's life-forms, including the bristlecone pine at 5062 years or 5067 years, invertebrates like the hard clam (known as "quahog" in new england) at 508 years, the greenland shark at 400 years, various deep-sea tube worms at over 300 years, fish like the sturgeon and the rockfish, and the sea anemone and lobster. such organisms are sometimes said to exhibit negligible senescence. the genetic aspect has also been demonstrated in studies of human centenarians.