part of develops from sclerite mesothoracic episternum katepisternum preepisternum fly_anatomy.ontology Accordingly to McAlpine (1981) the mesothoracic katepisternum is frequently, but incorrectly called the sternopleuron (as in Steiner 1976). Although in Diptera the mesosternum (ventral sclerite of the mesothorax) is greatly reduced and internalized, it is not fused with the katepisternum, and thus the latter should not be called sternopleuron. However, it seems that most publications still use the term sternopleuron (or sternopleurite) to refer to the katepisternum - https://orcid.org/0000-0001-5948-3092. sternopleuron sternopleurite sternopleura FBbt:00004599 https://www.ento.csiro.au/biology/drosophila/melanogaster.html?katepisternum The lower part of the mesothoracic episternum. It is separated from the dorsal mesothoracic episternum (anepisternum or mesopleuron) by the anapleural suture. presumptive mesothoracic structures from mesothoracic leg disc