Atavisms: 4 Lost Traits That Returned

Atavisms: 4 Lost Traits That Returned

Every once in a while, traits thought to be lost forever suddenly reappear, like a dolphin or a whale born with complete hind limbs! Known as atavisms, these occurrences can teach us all sorts of things, like how limbs actually grow.

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Sources:
Dollo’s Law/Atavisms
https://pubmed.ncbi.nlm.nih.gov/7991619/
https://doi.org/10.1016/j.tree.2008.06.013
https://doi.org/10.1002/ajmg.a.36234
Cetacean Hind Limbs
https://doi.org/10.1007/978-1-4899-0159-0_10
https://doi.org/10.1073/pnas.0602920103
https://doi.org/10.1046/j.1525-142X.2002.02033.x
Limpet Shell Twists
https://pubmed.ncbi.nlm.nih.gov/16701270/
https://doi.org/10.1098/rspb.2003.2517
Soil Mite Sex
https://doi.org/10.1073/pnas.0700034104
https://doi.org/10.1002/ece3.5303
https://doi.org/10.1016/0305-1978(92)90056-J
Big Bone Worm Males
https://doi.org/10.1016/j.cub.2014.11.032
https://doi.org/10.1016/j.crvi.2008.10.007
https://doi.org/10.1038/s41467-017-01002-8
https://doi.org/10.1186/1741-7007-7-74

Images:
https://commons.wikimedia.org/wiki/File:Anthracotherium_magnum.jpg
https://link.springer.com/article/10.1007/s12052-009-0135-2/figures/24
https://link.springer.com/article/10.1007/s12052-009-0135-2/figures/2
https://commons.wikimedia.org/wiki/File:Trochita_trochiformis_01.JPG
https://www.inaturalist.org/observations/19706160
https://www.inaturalist.org/observations/35191166
https://www.inaturalist.org/observations/32780129
https://www.inaturalist.org/observations/7073348
Crepidula fornicata (common Atlantic slipper snail) attached to a Strombus alatus shell (Cayo Costa Island, USA) 4
Tiny Shiny Mite
https://eol.org/media/6248881
Tiny Mite
Tiny Mite
Male Osedax Bone Worm
Female Osedax priapus
https://www.flickr.com/photos/scrippsocean/15372997583/in/album-72157647375239253/

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