Tagmata Arthropoda Diagram. In the ancestral arthropod the body was made up of repeated segments each with similar internal organs and appendages. Scorpions with diagram phylum arthropoda.
Two tagmata head and trunk one pair of antennae with 14 or more segments one pair of legs per trunk segment. Notice that the tagmata consist of groups of segments and that the abdomen is divided into two subregions. Use the diagram and descriptions provided in figures 4 and 5 to label the anatomical elements highlighted in this photograph of the trilobite phacops rana.
The development of distinct tagmata is believed to be a feature of the evolution of segmented animals especially arthropods.
In the ancestral arthropod the body was made up of repeated segments each with similar internal organs and appendages. The last region of the body is called the telson and it is not. Their segmented body plan consists of a series of repeated morphological units which are grouped into tagmata dedicated to specific functions. Problem 5 propose an explanation for why annelids and arthropods were thought to be closely related before phylogenetic analyses in the late 1990 s.