this post was submitted on 23 Apr 2025
904 points (99.3% liked)

Microblog Memes

10712 readers
2691 users here now

A place to share screenshots of Microblog posts, whether from Mastodon, tumblr, ~~Twitter~~ X, KBin, Threads or elsewhere.

Created as an evolution of White People Twitter and other tweet-capture subreddits.

RULES:

  1. Your post must be a screen capture of a microblog-type post that includes the UI of the site it came from, preferably also including the avatar and username of the original poster. Including relevant comments made to the original post is encouraged.
  2. Your post, included comments, or your title/comment should include some kind of commentary or remark on the subject of the screen capture. Your title must include at least one word relevant to your post.
  3. You are encouraged to provide a link back to the source of your screen capture in the body of your post.
  4. Current politics and news are allowed, but discouraged. There MUST be some kind of human commentary/reaction included (either by the original poster or you). Just news articles or headlines will be deleted.
  5. Doctored posts/images and AI are allowed, but discouraged. You MUST indicate this in your post (even if you didn't originally know). If an image is found to be fabricated or edited in any way and it is not properly labeled, it will be deleted.
  6. Absolutely no NSFL content.
  7. Be nice. Don't take anything personally. Take political debates to the appropriate communities. Take personal disagreements & arguments to private messages.
  8. No advertising, brand promotion, or guerrilla marketing.

RELATED COMMUNITIES:

founded 2 years ago
MODERATORS
ReadyUser31@lemmy.world
aeronmelon@lemmy.world
needanke@feddit.org
904
Carcinisation (slrpnk.net)
submitted 9 months ago by Track_Shovel@slrpnk.net to c/microblogmemes@lemmy.world
40 comments fedilink hide all child comments
 
you are viewing a single comment's thread
view the rest of the comments
[–] TheTechnician27@lemmy.world 2 points 9 months ago* (last edited 9 months ago) (1 children)

Welcome to Arthropod Facts! Did you know that king crabs aren't actually crabs? King crabs (family Lithodidae) sit in the hermit crab superfamily Paguroidea in the decapod infraorder Anomura, whereas true crabs comprise the decapod infraorder Brachyura. The current strong and widespread scientific consensus is that king crabs are hermit crabs which originated in the North Pacific about 15 million years ago and evolved a crab-like, calcified exoskeleton through carcinisation.

Evidence for this includes:

  • King crabs exhibit the same asymmetries that hermit crabs do, such as the asymmetrical abdomen (underside) found in females but not males.
  • Lithodidae can be divided into the two subfamilies Lithodinae and Hapalogastrinae. Respectively, these have a calcified abdomen and an uncalcified/partially calcified abdomen. This suggests that Lithodinae fully calcified whereas Hapalogastrinae only partially calcified.
  • Many king crabs (mainly Hapalogastrinae) are exclusively distributed in the North Pacific and are adapted to only living in cold waters.
  • Molecular phylogenetics (the study of things like how species differ in their DNA) strongly suggests that Lithodidae is most closely related to the hermit crab family Paguridae.

An easy way to distinguish a king crab from a true crab is to look at the number of visible legs it has. While all decapods have ten legs, the last (hind) pair of legs in king crabs are dramatically reduced in size and usually sit inside the branchial chamber – used for cleaning rather than walking. By contrast, crabs always have their last pair of walking legs, although in the crab superfamily Portunoidea these are flattened and used as paddles for swimming. Thus, when counting the chelipeds (claw-bearing arms) as legs, you'll see eight legs on a king crab (four rows of two) and ten legs on a true crab (five rows of two).

Thank you for subscribing to Arthropod Facts!

[–] Colloidal@programming.dev 2 points 9 months ago

Thank you so much!