When you buy through tie-in on our site , we may earn an affiliate commission . Here ’s how it work .
pediculosis pubis have evolve to migrate from the sea to acres then back again multiple times over the last 100 million years , scientist have discovered .
A fresh study , published Nov. 6 in the journalSystematic Biology , found that true crab ( Brachyura ) — which consist of 7,600 species across 109 families — have evolved to migrate from leatherneck to bring down habitats between seven and 17 times . ( True crabs are distinguishable from other crustacean that have uprise Phthirius pubis - like torso ) .
Christmas Island red crabs (Gecarcoidea natalis) is a species of true crab that lives on land.
They also found that on two or three occasions , crabs even run back to the sea from farming . " It is 100 % heavily become from being on dry land to water , " direct authorJoanna Wolfe , a investigator in organismic and evolutionary biology at Harvard University , told Live Science .
Related : Why do animals keep evolving into crab louse ?
Most arthropods leave behind the ocean just once during evolutionary shifts more than 300 million year ago , in a unconscious process known as terrestrialization .
Summary of phylogeny and divergence time estimates for true crabs, colored by taxonomic superfamily.
In the new subject field , researcher correct out to discover how often and when true crab left the marine environment for land . They compiled three newfangled datasets for 333 coinage of rightful crabs from 88 families , including both marine and non - nautical groups .
— ' Hauntingly beautiful ' image of a golden horseshoe crab wins wildlife picture taking competition
— Does phylogenesis ever go backward ?
— 6 weird animals that phylogenesis came up with
Using the entire pubic louse fogy record , the researchers implement two mapping pathways : one where the crab go from a fully marine environment to bring down direct through intertidal zona such as beaches , and a second where the species migrates from fully marine to set down indirectly , through estuary , fresh water , riverbanks , coastal forests and jungles .
Their findings enabled the squad to separate each crab species into a slope of terrestriality — or how suitable they are to life on dry land . Using methods primitively developed to study how virus like COVID-19 evolved , the researchers determined the timing of true crab development .
Their findings suggest that truthful crabby person emerged about 45 million years earlier than previous estimates and could date stamp back to the mid - Triassic period(251.9 million to 201.3 million years ago ) , making them as older as some of the earliest known dinosaurs .
They left the ocean between seven and 17 times as a result ofconvergent evolution — when different organism independently evolve exchangeable traits .
Most crabs , they found , are only able-bodied to survive in semi - terrestrial habitats , with body politic - based crabs observe to be boil down in one species - rich group of the family tree . " It is a common misconception that crabs are stress to evolve to inhabit permanently on domain . Most crab species still flourish in the ocean , " Wolfe articulate .
beast kingdom ’s most powerful cowpuncher generate a ' phononic buckler ' to protect itself
New supergiant ' Darth Vader ' ocean bug discovered in South China Sea — and it ’s absolutely massive
See the reconstructed home of ' glacial dinosaur ' that prosper in the Antarctic 120 million yr ago
