<figure class="figure">
<img src="../images/class-pupil-round-vertical-round.svg" class="img-fluid border">
</figure> 
<br>
Pupil changes shape during constriction. It constricts horizontally and vertically. <a href="https://doi.org/10.11646/zootaxa.4344.2.8">The photos in Brian Bush's paper (FIGURE 4 & 6)</a> show this for <i>Suta fasciata</i> and <i>Suta punctata</i>. The shape of a semi-closed pupil may be elliptical, subelliptical, rhombic or oval. In all cases the orientation is vertically when semi-closed.