Negligibly senescent organisms

class of marine invertebrates

thumb|Lobsters awaiting purchase in Trenton, Maine

order of cnidarians

genus of cnidarians

burrowing rodent; one of only two known eusocial mammals

species of plant

species of small, biologically immortal jellyfish

species of mollusc

species of mollusc

Sebastes is a genus of marine ray-finned fish belonging to the subfamily Sebastinae part of the family Scorpaenidae, most of which have the common name of rockfish. A few are called ocean perch, sea perch or redfish instead. They are found in the Atlantic and Pacific Oceans.

Sanicula is a genus of plants in family Apiaceae (or Umbelliferae), the same family to which the carrot and parsnip belong. This genus has about 45 species worldwide, with at least 22 in North America. The common names usually include the terms sanicle or black snakeroot.

thumb|Unidentified planarian

characteristic of organisms displaying no decline in survival capacity relative to age

Wikimedia list article

thumb|American aspens, Populus tremuloides

species of cnidarian