Interior parts of animals are somethings that may be forgotten about. People go through biology classes to see the interiors, yet do we really think about them?
Do we really realize that all animals have similar organs to ourselves? Do we stop to think about that?
During my last several posts about horseshoe crabs, I made a list of the body parts I haven’t talked about and usually don’t.
They have: a prosoma (top part), opisthosoma (abdomen), carapace (covering), hinge, chelicera, gnathobase, chilarium, genital operculum, gill opercula, gills, anus, cardiac, extracardiac, and subopthalmic. And I may be missing one or two.
Horseshoe crabs breathe through their gills like fish do yet their gills are on the underside of their bodies. One can only see them when you pick one up and turn it over. They looked like layered fans. Their gills allow them to breathe, unlike fish, both in water and on land.
And yes, they have a cardiac system to move that blue blood around. (See earlier post). One of the main criticisms of their bleeding by pharmaceutical companies is that they insert the needles near the hinge on the horseshoe crab which is also right where their main cardiac is located. This would be like having a large needle jammed in your neck or chest and your blood sucked out. We don’t know for sure if they feel pain but they must if they have a brain and neurological system.