setae

Those little ‘hairs’ you see all over the body and chelipeds of your hermit crab are not hairs at all. They are an extension of the exoskeleton and are called setae. A seta is an elongate projection with a more or less circular base and a continuous lumen; the lumen has a semicircular arrangement of sheath cells basally. [1] Revising the definition of the crustacean seta and setal classification systems based on examinations of the mouthpart setae of seven species of decapods A. GARM Zoological Journal of the Linnean Society, Volume 142, Issue 2, October 2004, Pages 233–252 What in the function of setae? NotRead More →