They have an exoskeleton rather than an endoskeleton like mammalia or reptilia
Ladybirds are insects; all insects have an external skeleton without a backbone.
There is loads of breeds of ladybirds also known as (Ladybugs.) The ladybird you say to have no spots that is normal. The ladybird breed you have is the California lady Beetle and it should have a black line going down its hard shell with a small curve spot near the head.
They have a type of skeleton called a hydrostatic skeleton. This type of skeleton is a fluid filled sac which is surrounded by muscles.
internal skeleton
Internal Skeleton
a sponge skeleton
it doesn't have a skeleton
worm
A ladybug (ladybird in British English) is a type of beetle.
Some examples of living things that do not have a skeleton include jellyfish, worms, octopuses, and insects. These animals have other structural support systems in place of a skeleton, such as exoskeletons or hydrostatic skeletons.
A Ladybird does not kill
There are 62,305 different type of skeleton.