|This fantastic image by Tyson Jerry from North Sulawesi|
Those pictures were close ups of asteroids from cold-water settings in the North Pacific & North Atlantic. There's a very different fauna of asteroids in those parts of the world compared to the tropics.
Most of the starfish in the tropical Indian and Pacific Oceans show a lot of granules, spination and armor and of course are composed of very different families of asteroids compared to those which live in the far North.
If you'd like to see some pics of the mouth armor in these types of starfish go here!
I start with the above : a STUNNING shot of Protoreaster nodosus, a commonly encountered sea star found throughout the Pacific. Shots below are macro shots showing skeletal features and colors of different tropical, Indo-Pacific starfish species.
More close up on Protoreaster with more pointed spines. Image by Nick Robertson Brown (Frogfish Photos)
What are these weird threads? Feeding tentacles from a benthic ctenophore? Gametes? Weird. Photo by MerMate (Eunice Khoo)
The strange soft-warty structures are a distinguishing feature on the surface of Echinaster callosus! Function unknown. Images by Optical Allusion
Some fantastic detail on the ophidiasterid Nardoa. Image by Stephane Bailliez
Here's a close up on Gomophia gomophia. Image by Okinawa Nature Photography (Shawn Miller)
An awesome close up of the disk on Fromia nodosa from the Maldives. Image by Philippe Guillaume.
Close up of Fromia indica. Image by Jesse Claggett
The papulae (aka the gills) and spines of Acanthaster planci-the Crown of Thorns starfish. Image by Barry Fackler.
another tight shot of a brittle star (Ophiothela?) living on the asteroid Nardoa. Image by deco4macro
Surface spines on Pentaceraster. The tiny white circles on the brown spaces are papulae aka the gills. Image by Friscodive.