The tritosternal basetritosternal base:
the usually columnar basal part of the tritosternum; sometimes expanded and rectangular or otherwise modified.
is more or less columnar primitively, but becomes broadened to occupy most of the space between coxae I in several groups. In some Uropodoidea, the coxae of legs I are flattened and broadened and cover up the tritosternumtritosternum:
the sternum of the 3rd body segment (between legs I); produced as a biflagellate structure in Mesostigmata, although sometimes the flagellae (laciniae) are partially or completely fused. 
. The tritosternumtritosternum:
the sternum of the 3rd body segment (between legs I); produced as a biflagellate structure in Mesostigmata, although sometimes the flagellae (laciniae) are partially or completely fused. is highly reduced or lost in some parasites and male Parasitidae.
Author: David E. Walter
Content last updated Sept. 2006, unless indicated otherwise
Lucid key player updated Sept. 2025
idtools.org
