title: Head segmentation in early cambrian fuxianhuia: implications for arthropod evolution.
abstract: The arthropod Fuxianhuia from the Chengjiang fauna displays primitive aspects of cephalic segmentation and trunk limb morphology that indicate a basal position within Euarthropoda. The cephalon consists of an eye-bearing sclerite that articulates with a head shield bearing antennules and subchelate appendages. Eye stalks, antennules, and subchelate appendages are proto-, deuto-, and tritocerebral limbs and organs, respectovely. The anterior position of the eye-bearing sclerite parallels the embryonic origin of arthropod eye lobes. The head of Fuxianhuia includes the acron and one somite and is regarded as a protocephalon. The definitive head of arthropods may have fused separate eye-bearing and appendage-bearing sclerites.
authors.forename: J Y
authors.initials: JY
authors.lastname: Chen
authors.forename: G Q
authors.initials: GQ
authors.lastname: Zhou
authors.forename: G D
authors.initials: GD
authors.lastname: Edgecombe
authors.forename: L
authors.initials: L
authors.lastname: Ramsköld