Fig. 14

Chasmataspidid appendage VI podomere homology. Comparison of the morphology of appendage VI of the chasmataspidids Chasmataspis, Hoplitaspis, Dvulikiaspis, Diploaspis, and Octoberaspis and the eurypterids Rhenopterus, Moselopterus, Onychopterella, Eurypterus and Parahughmilleria. Proposed homology of the femur and distal podomeres are shown through color coding: yellow = femur (divided into the basifemur and telofemur in eurypterids), green = basitarsus, red = telotarsus, blue = apotele, black = ‘podomere’ 7a. Where the podomere morphology is unknown the reconstruction is shown by a dashed outline. The change in endopod insertion on the coxa in Diploaspis and Octoberaspis is inferred through the angle at which the paddle projects from underneath the prosomal shield and the in situ preservation of the coxa of Octoberaspis