..., but spiders could remain inside for more than a day without renewal. Spiders appeared to enlarge the bells in response to higher O 2 demands and lower aquatic P O 2 . * Author for correspondence ( roger.seymour@adelaide.edu.au ) 5 4 2011 © 2011. 2011 arachnid gas exchange metabolic...

...Andrew T. Sensenig; Jeffrey W. Shultz SUMMARY Certain leg joints in arachnids lack extensor muscles and have elastically deformable transarticular sclerites spanning their arthrodial membranes, an arrangement consistent with a model in which flexor muscles load transarticular sclerites during...

...Jeffrey W. Shultz ABSTRACT Activity patterns of six morphologically similar, homologous muscles were recorded from the fourth leg pair in two species of arachnids that use different mechanisms to extend the femur-patella (knee) joint during locomotion. The giant whipscorpion Mastigoproctus...