Search results
Results from the WOW.Com Content Network
The arthropod head problem has been tackled in three main ways in this regard, first by using genetic segmental markers to probe the obscure region in front of the mouth, especially in insects; second by looking at Hox gene expression patterns to detect patterns of homology among different arthropods; and third, by studying gene expression in ...
Nevertheless, despite being known from many specimens, disputes about its morphology, in particular its head appendages, have made it one of the most controversial of the Chengjiang taxa, and it has been discussed extensively in the context of the arthropod head problem. The genus is named after Fuxian Lake (Fuxian Hu), where it was unearthed.
Arthropod head problem – Dispute concerning the evolution of arthropods; Deep homology – Control of growth and differentiation by deeply conserved genetic mechanisms; Evolutionary developmental biology – Comparison of organism developmental processes
Main page; Contents; Current events; Random article; About Wikipedia; Contact us
Arthropod eyes Head of a wasp with three ocelli (center), and compound eyes at the left and right. Most arthropods have sophisticated visual systems that include one or more usually both of compound eyes and pigment-cup ocelli ("little eyes"). In most cases, ocelli are only capable of detecting the direction from which light is coming, using ...
In chelicerates and crustaceans, the cephalothorax is derived from the fusion of the cephalon and the thorax, and is usually covered by a single unsegmented carapace.In relation with the arthropod head problem, phylogeny studies show that members of the Malacostraca class of crustaceans have five segments in the cephalon, when not fused with the thorax to form a cephalothorax.
Arthropod head problem; B. Blowhole (anatomy) C. Cephalon (arthropod head) Composition of the protocerebrum; H. Head transplant; P.
Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate